1761 lines
70 KiB
Markdown
1761 lines
70 KiB
Markdown
---
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stage: Package
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group: Package
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# GitLab Container Registry administration **(FREE SELF)**
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With the GitLab Container Registry, every project can have its
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own space to store Docker images.
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Read more about the Docker Registry in [the Docker documentation](https://docs.docker.com/registry/introduction/).
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This document is the administrator's guide. To learn how to use the GitLab Container
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Registry, see the [user documentation](../../user/packages/container_registry/index.md).
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## Enable the Container Registry
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**Omnibus GitLab installations**
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If you installed GitLab by using the Omnibus installation package, the Container Registry
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may or may not be available by default.
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The Container Registry is automatically enabled and available on your GitLab domain, port 5050 if:
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- You're using the built-in [Let's Encrypt integration](https://docs.gitlab.com/omnibus/settings/ssl.html#lets-encrypt-integration), and
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- You're using GitLab 12.5 or later.
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Otherwise, the Container Registry is not enabled. To enable it:
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- You can configure it for your [GitLab domain](#configure-container-registry-under-an-existing-gitlab-domain), or
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- You can configure it for [a different domain](#configure-container-registry-under-its-own-domain).
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The Container Registry works under HTTPS by default. You can use HTTP
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but it's not recommended and is beyond the scope of this document.
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Read the [insecure Registry documentation](https://docs.docker.com/registry/insecure/)
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if you want to implement this.
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**Installations from source**
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If you have installed GitLab from source:
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1. You must [install Registry](https://docs.docker.com/registry/deploying/) by yourself.
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1. After the installation is complete, to enable it, you must configure the Registry's
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settings in `gitlab.yml`.
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1. Use the sample NGINX configuration file from under
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[`lib/support/nginx/registry-ssl`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/support/nginx/registry-ssl) and edit it to match the
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`host`, `port`, and TLS certificate paths.
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The contents of `gitlab.yml` are:
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```yaml
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registry:
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enabled: true
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host: registry.gitlab.example.com
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port: 5005
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api_url: http://localhost:5000/
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key: config/registry.key
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path: shared/registry
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issuer: gitlab-issuer
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```
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Where:
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| Parameter | Description |
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| --------- | ----------- |
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| `enabled` | `true` or `false`. Enables the Registry in GitLab. By default this is `false`. |
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| `host` | The host URL under which the Registry runs and users can use. |
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| `port` | The port the external Registry domain listens on. |
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| `api_url` | The internal API URL under which the Registry is exposed. It defaults to `http://localhost:5000`. Do not change this unless you are setting up an [external Docker registry](#use-an-external-container-registry-with-gitlab-as-an-auth-endpoint). |
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| `key` | The private key location that is a pair of Registry's `rootcertbundle`. Read the [token auth configuration documentation](https://docs.docker.com/registry/configuration/#token). |
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| `path` | This should be the same directory like specified in Registry's `rootdirectory`. Read the [storage configuration documentation](https://docs.docker.com/registry/configuration/#storage). This path needs to be readable by the GitLab user, the web-server user and the Registry user. Read more in [#configure-storage-for-the-container-registry](#configure-storage-for-the-container-registry). |
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| `issuer` | This should be the same value as configured in Registry's `issuer`. Read the [token auth configuration documentation](https://docs.docker.com/registry/configuration/#token). |
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A Registry init file is not shipped with GitLab if you install it from source.
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Hence, [restarting GitLab](../restart_gitlab.md#installations-from-source) does not restart the Registry should
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you modify its settings. Read the upstream documentation on how to achieve that.
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At the **absolute** minimum, make sure your [Registry configuration](https://docs.docker.com/registry/configuration/#auth)
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has `container_registry` as the service and `https://gitlab.example.com/jwt/auth`
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as the realm:
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```yaml
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auth:
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token:
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realm: https://gitlab.example.com/jwt/auth
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service: container_registry
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issuer: gitlab-issuer
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rootcertbundle: /root/certs/certbundle
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```
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WARNING:
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If `auth` is not set up, users can pull Docker images without authentication.
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## Container Registry domain configuration
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There are two ways you can configure the Registry's external domain. Either:
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- [Use the existing GitLab domain](#configure-container-registry-under-an-existing-gitlab-domain).
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The Registry listens on a port and reuses the TLS certificate from GitLab.
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- [Use a completely separate domain](#configure-container-registry-under-its-own-domain) with a new TLS certificate
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for that domain.
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Because the Container Registry requires a TLS certificate, cost may be a factor.
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Take this into consideration before configuring the Container Registry
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for the first time.
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### Configure Container Registry under an existing GitLab domain
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If the Registry is configured to use the existing GitLab domain, you can
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expose the Registry on a port. This way you can reuse the existing GitLab TLS
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certificate.
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If the GitLab domain is `https://gitlab.example.com` and the port to the outside world is `5050`, here is what you need to set
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in `gitlab.rb` or `gitlab.yml` if you are using Omnibus GitLab or installed
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GitLab from source respectively.
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Ensure you choose a port different than the one that Registry listens to (`5000` by default),
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otherwise conflicts occur.
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NOTE:
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Host and container firewall rules must be configured to allow traffic in through the port listed
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under the `registry_external_url` line, rather than the port listed under
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`gitlab_rails['registry_port']` (default `5000`).
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**Omnibus GitLab installations**
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1. Your `/etc/gitlab/gitlab.rb` should contain the Registry URL as well as the
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path to the existing TLS certificate and key used by GitLab:
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```ruby
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registry_external_url 'https://gitlab.example.com:5050'
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```
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The `registry_external_url` is listening on HTTPS under the
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existing GitLab URL, but on a different port.
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If your TLS certificate is not in `/etc/gitlab/ssl/gitlab.example.com.crt`
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and key not in `/etc/gitlab/ssl/gitlab.example.com.key` uncomment the lines
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below:
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```ruby
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registry_nginx['ssl_certificate'] = "/path/to/certificate.pem"
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registry_nginx['ssl_certificate_key'] = "/path/to/certificate.key"
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```
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1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure)
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for the changes to take effect.
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1. Validate using:
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```shell
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openssl s_client -showcerts -servername gitlab.example.com -connect gitlab.example.com:5050 > cacert.pem
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```
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If your certificate provider provides the CA Bundle certificates, append them to the TLS certificate file.
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An administrator may want the container registry listening on an arbitrary port such as `5678`.
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However, the registry and application server are behind an AWS application load balancer that only
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listens on ports `80` and `443`. The administrator may simply remove the port number for
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`registry_external_url`, so HTTP or HTTPS is assumed. Then, the rules apply that map the load
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balancer to the registry from ports `80` or `443` to the arbitrary port. This is important if users
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rely on the `docker login` example in the container registry. Here's an example:
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```ruby
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registry_external_url 'https://registry-gitlab.example.com'
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registry_nginx['redirect_http_to_https'] = true
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registry_nginx['listen_port'] = 5678
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```
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**Installations from source**
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1. Open `/home/git/gitlab/config/gitlab.yml`, find the `registry` entry and
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configure it with the following settings:
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```yaml
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registry:
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enabled: true
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host: gitlab.example.com
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port: 5050
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```
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1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
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1. Make the relevant changes in NGINX as well (domain, port, TLS certificates path).
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Users should now be able to sign in to the Container Registry with their GitLab
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credentials using:
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```shell
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docker login gitlab.example.com:5050
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```
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### Configure Container Registry under its own domain
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When the Registry is configured to use its own domain, you need a TLS
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certificate for that specific domain (for example, `registry.example.com`). You might need
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a wildcard certificate if hosted under a subdomain of your existing GitLab
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domain, for example, `registry.gitlab.example.com`.
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As well as manually generated SSL certificates (explained here), certificates automatically
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generated by Let's Encrypt are also [supported in Omnibus installs](https://docs.gitlab.com/omnibus/settings/ssl.html#host-services).
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Let's assume that you want the container Registry to be accessible at
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`https://registry.gitlab.example.com`.
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**Omnibus GitLab installations**
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1. Place your TLS certificate and key in
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`/etc/gitlab/ssl/registry.gitlab.example.com.crt` and
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`/etc/gitlab/ssl/registry.gitlab.example.com.key` and make sure they have
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correct permissions:
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```shell
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chmod 600 /etc/gitlab/ssl/registry.gitlab.example.com.*
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```
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1. After the TLS certificate is in place, edit `/etc/gitlab/gitlab.rb` with:
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```ruby
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registry_external_url 'https://registry.gitlab.example.com'
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```
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The `registry_external_url` is listening on HTTPS.
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1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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If you have a [wildcard certificate](https://en.wikipedia.org/wiki/Wildcard_certificate), you must specify the path to the
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certificate in addition to the URL, in this case `/etc/gitlab/gitlab.rb`
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looks like:
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```ruby
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registry_nginx['ssl_certificate'] = "/etc/gitlab/ssl/certificate.pem"
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registry_nginx['ssl_certificate_key'] = "/etc/gitlab/ssl/certificate.key"
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```
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**Installations from source**
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1. Open `/home/git/gitlab/config/gitlab.yml`, find the `registry` entry and
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configure it with the following settings:
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```yaml
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registry:
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enabled: true
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host: registry.gitlab.example.com
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```
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1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
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1. Make the relevant changes in NGINX as well (domain, port, TLS certificates path).
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Users should now be able to sign in to the Container Registry using their GitLab
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credentials:
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```shell
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docker login registry.gitlab.example.com
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```
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## Disable Container Registry site-wide
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When you disable the Registry by following these steps, you do not
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remove any existing Docker images. This is handled by the
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Registry application itself.
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**Omnibus GitLab**
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1. Open `/etc/gitlab/gitlab.rb` and set `registry['enable']` to `false`:
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```ruby
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registry['enable'] = false
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```
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1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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**Installations from source**
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1. Open `/home/git/gitlab/config/gitlab.yml`, find the `registry` entry and
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set `enabled` to `false`:
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```yaml
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registry:
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enabled: false
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```
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1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
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## Disable Container Registry for new projects site-wide
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If the Container Registry is enabled, then it should be available on all new
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projects. To disable this function and let the owners of a project to enable
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the Container Registry by themselves, follow the steps below.
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**Omnibus GitLab installations**
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1. Edit `/etc/gitlab/gitlab.rb` and add the following line:
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```ruby
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gitlab_rails['gitlab_default_projects_features_container_registry'] = false
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```
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1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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**Installations from source**
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1. Open `/home/git/gitlab/config/gitlab.yml`, find the `default_projects_features`
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entry and configure it so that `container_registry` is set to `false`:
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```yaml
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## Default project features settings
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default_projects_features:
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issues: true
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merge_requests: true
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wiki: true
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snippets: false
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builds: true
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container_registry: false
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```
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1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
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## Configure storage for the Container Registry
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NOTE:
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For storage backends that support it, you can use object versioning to preserve, retrieve, and
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restore the non-current versions of every object stored in your buckets. However, this may result in
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higher storage usage and costs. Due to how the registry operates, image uploads are first stored in
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a temporary path and then transferred to a final location. For object storage backends, including S3
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and GCS, this transfer is achieved with a copy followed by a delete. With object versioning enabled,
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these deleted temporary upload artifacts are kept as non-current versions, therefore increasing the
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storage bucket size. To ensure that non-current versions are deleted after a given amount of time,
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you should configure an object lifecycle policy with your storage provider.
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You can configure the Container Registry to use various storage backends by
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configuring a storage driver. By default the GitLab Container Registry
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is configured to use the [file system driver](#use-file-system)
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configuration.
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The different supported drivers are:
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| Driver | Description |
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|--------------|--------------------------------------|
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| `filesystem` | Uses a path on the local file system |
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| `azure` | Microsoft Azure Blob Storage |
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| `gcs` | Google Cloud Storage |
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| `s3` | Amazon Simple Storage Service. Be sure to configure your storage bucket with the correct [S3 Permission Scopes](https://docs.docker.com/registry/storage-drivers/s3/#s3-permission-scopes). |
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| `swift` | OpenStack Swift Object Storage |
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| `oss` | Aliyun OSS |
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Although most S3 compatible services (like [MinIO](https://min.io/)) should work with the Container Registry, we only guarantee support for AWS S3. Because we cannot assert the correctness of third-party S3 implementations, we can debug issues, but we cannot patch the registry unless an issue is reproducible against an AWS S3 bucket.
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Read more about the individual driver's configuration options in the
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[Docker Registry docs](https://docs.docker.com/registry/configuration/#storage).
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### Use file system
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If you want to store your images on the file system, you can change the storage
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path for the Container Registry, follow the steps below.
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This path is accessible to:
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- The user running the Container Registry daemon.
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- The user running GitLab.
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All GitLab, Registry, and web server users must
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have access to this directory.
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**Omnibus GitLab installations**
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The default location where images are stored in Omnibus, is
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`/var/opt/gitlab/gitlab-rails/shared/registry`. To change it:
|
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1. Edit `/etc/gitlab/gitlab.rb`:
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```ruby
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gitlab_rails['registry_path'] = "/path/to/registry/storage"
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```
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1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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**Installations from source**
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The default location where images are stored in source installations, is
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`/home/git/gitlab/shared/registry`. To change it:
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1. Open `/home/git/gitlab/config/gitlab.yml`, find the `registry` entry and
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change the `path` setting:
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|
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```yaml
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registry:
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path: shared/registry
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```
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1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
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### Use object storage
|
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If you want to store your images on object storage, you can change the storage
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driver for the Container Registry.
|
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[Read more about using object storage with GitLab](../object_storage.md).
|
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WARNING:
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GitLab does not back up Docker images that are not stored on the
|
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file system. Enable backups with your object storage provider if
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desired.
|
||
|
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**Omnibus GitLab installations**
|
||
|
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To configure the `s3` storage driver in Omnibus:
|
||
|
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1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
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```ruby
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registry['storage'] = {
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's3' => {
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'accesskey' => 's3-access-key',
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'secretkey' => 's3-secret-key-for-access-key',
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'bucket' => 'your-s3-bucket',
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'region' => 'your-s3-region',
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'regionendpoint' => 'your-s3-regionendpoint'
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}
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}
|
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```
|
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|
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To avoid using static credentials, use an
|
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[IAM role](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html)
|
||
and omit `accesskey` and `secretkey`. Make sure that your IAM profile follows
|
||
[the permissions documented by Docker](https://docs.docker.com/registry/storage-drivers/s3/#s3-permission-scopes).
|
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|
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```ruby
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registry['storage'] = {
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's3' => {
|
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'bucket' => 'your-s3-bucket',
|
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'region' => 'your-s3-region'
|
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}
|
||
}
|
||
```
|
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|
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If using with an [AWS S3 VPC endpoint](https://docs.aws.amazon.com/vpc/latest/privatelink/vpc-endpoints-s3.html),
|
||
then set `regionendpoint` to your VPC endpoint address and set `pathstyle` to false:
|
||
|
||
```ruby
|
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registry['storage'] = {
|
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's3' => {
|
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'accesskey' => 's3-access-key',
|
||
'secretkey' => 's3-secret-key-for-access-key',
|
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'bucket' => 'your-s3-bucket',
|
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'region' => 'your-s3-region',
|
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'regionendpoint' => 'your-s3-vpc-endpoint',
|
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'pathstyle' => false
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}
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}
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```
|
||
|
||
- `regionendpoint` is only required when configuring an S3 compatible service such as MinIO, or
|
||
when using an AWS S3 VPC Endpoint.
|
||
- `your-s3-bucket` should be the name of a bucket that exists, and can't include subdirectories.
|
||
- `pathstyle` should be set to true to use `host/bucket_name/object` style paths instead of
|
||
`bucket_name.host/object`. [Set to false for AWS S3](https://aws.amazon.com/blogs/aws/amazon-s3-path-deprecation-plan-the-rest-of-the-story/).
|
||
|
||
You can set a rate limit on connections to S3 to avoid 503 errors from the S3 API. To do this,
|
||
set `maxrequestspersecond` to a number within the [S3 request rate threshold](https://aws.amazon.com/premiumsupport/knowledge-center/s3-503-within-request-rate-prefix/):
|
||
|
||
```ruby
|
||
registry['storage'] = {
|
||
's3' => {
|
||
'accesskey' => 's3-access-key',
|
||
'secretkey' => 's3-secret-key-for-access-key',
|
||
'bucket' => 'your-s3-bucket',
|
||
'region' => 'your-s3-region',
|
||
'regionendpoint' => 'your-s3-regionendpoint',
|
||
'maxrequestspersecond' => 100
|
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}
|
||
}
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**Installations from source**
|
||
|
||
Configuring the storage driver is done in the registry configuration YML file created
|
||
when you [deployed your Docker registry](https://docs.docker.com/registry/deploying/).
|
||
|
||
`s3` storage driver example:
|
||
|
||
```yaml
|
||
storage:
|
||
s3:
|
||
accesskey: 's3-access-key' # Not needed if IAM role used
|
||
secretkey: 's3-secret-key-for-access-key' # Not needed if IAM role used
|
||
bucket: 'your-s3-bucket'
|
||
region: 'your-s3-region'
|
||
regionendpoint: 'your-s3-regionendpoint'
|
||
cache:
|
||
blobdescriptor: inmemory
|
||
delete:
|
||
enabled: true
|
||
```
|
||
|
||
`your-s3-bucket` should be the name of a bucket that exists, and can't include subdirectories.
|
||
|
||
#### Migrate to object storage without downtime
|
||
|
||
WARNING:
|
||
Using [AWS DataSync](https://aws.amazon.com/datasync/)
|
||
to copy the registry data to or between S3 buckets creates invalid metadata objects in the bucket.
|
||
For additional details, see [Tags with an empty name](#tags-with-an-empty-name).
|
||
To move data to and between S3 buckets, the AWS CLI `sync` operation is recommended.
|
||
|
||
To migrate storage without stopping the Container Registry, set the Container Registry
|
||
to read-only mode. On large instances, this may require the Container Registry
|
||
to be in read-only mode for a while. During this time,
|
||
you can pull from the Container Registry, but you cannot push.
|
||
|
||
1. Optional: To reduce the amount of data to be migrated, run the [garbage collection tool without downtime](#performing-garbage-collection-without-downtime).
|
||
1. This example uses the `aws` CLI. If you haven't configured the
|
||
CLI before, you have to configure your credentials by running `sudo aws configure`.
|
||
Because a non-administrator user likely can't access the Container Registry folder,
|
||
ensure you use `sudo`. To check your credential configuration, run
|
||
[`ls`](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3/ls.html) to list
|
||
all buckets.
|
||
|
||
```shell
|
||
sudo aws --endpoint-url https://your-object-storage-backend.com s3 ls
|
||
```
|
||
|
||
If you are using AWS as your back end, you do not need the [`--endpoint-url`](https://docs.aws.amazon.com/cli/latest/reference/#options).
|
||
1. Copy initial data to your S3 bucket, for example with the `aws` CLI
|
||
[`cp`](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3/cp.html)
|
||
or [`sync`](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3/sync.html)
|
||
command. Make sure to keep the `docker` folder as the top-level folder inside the bucket.
|
||
|
||
```shell
|
||
sudo aws --endpoint-url https://your-object-storage-backend.com s3 sync registry s3://mybucket
|
||
```
|
||
|
||
NOTE:
|
||
If you have a lot of data, you may be able to improve performance by
|
||
[running parallel sync operations](https://aws.amazon.com/premiumsupport/knowledge-center/s3-improve-transfer-sync-command/).
|
||
|
||
1. To perform the final data sync,
|
||
[put the Container Registry in `read-only` mode](#performing-garbage-collection-without-downtime) and
|
||
[reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure).
|
||
1. Sync any changes since the initial data load to your S3 bucket and delete files that exist in the destination bucket but not in the source:
|
||
|
||
```shell
|
||
sudo aws --endpoint-url https://your-object-storage-backend.com s3 sync registry s3://mybucket --delete --dryrun
|
||
```
|
||
|
||
After verifying the command performs as expected, remove the
|
||
[`--dryrun`](https://docs.aws.amazon.com/cli/latest/reference/s3/sync.html)
|
||
flag and run the command.
|
||
|
||
WARNING:
|
||
The [`--delete`](https://docs.aws.amazon.com/cli/latest/reference/s3/sync.html)
|
||
flag deletes files that exist in the destination but not in the source.
|
||
If you swap the source and destination, all data in the Registry is deleted.
|
||
|
||
1. Verify all Container Registry files have been uploaded to object storage
|
||
by looking at the file count returned by these two commands:
|
||
|
||
```shell
|
||
sudo find registry -type f | wc -l
|
||
```
|
||
|
||
```shell
|
||
sudo aws --endpoint-url https://your-object-storage-backend.com s3 ls s3://mybucket --recursive | wc -l
|
||
```
|
||
|
||
The output of these commands should match, except for the content in the
|
||
`_uploads` directories and sub-directories.
|
||
1. Configure your registry to [use the S3 bucket for storage](#use-object-storage).
|
||
1. For the changes to take effect, set the Registry back to `read-write` mode and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure).
|
||
|
||
### Disable redirect for storage driver
|
||
|
||
By default, users accessing a registry configured with a remote backend are redirected to the default backend for the storage driver. For example, registries can be configured using the `s3` storage driver, which redirects requests to a remote S3 bucket to alleviate load on the GitLab server.
|
||
|
||
However, this behavior is undesirable for registries used by internal hosts that usually can't access public servers. To disable redirects and [proxy download](../object_storage.md#proxy-download), set the `disable` flag to true as follows. This makes all traffic always go through the Registry service. This results in improved security (less surface attack as the storage backend is not publicly accessible), but worse performance (all traffic is redirected via the service).
|
||
|
||
**Omnibus GitLab installations**
|
||
|
||
1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
registry['storage'] = {
|
||
's3' => {
|
||
'accesskey' => 's3-access-key',
|
||
'secretkey' => 's3-secret-key-for-access-key',
|
||
'bucket' => 'your-s3-bucket',
|
||
'region' => 'your-s3-region',
|
||
'regionendpoint' => 'your-s3-regionendpoint'
|
||
},
|
||
'redirect' => {
|
||
'disable' => true
|
||
}
|
||
}
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**Installations from source**
|
||
|
||
1. Add the `redirect` flag to your registry configuration YML file:
|
||
|
||
```yaml
|
||
storage:
|
||
s3:
|
||
accesskey: 'AKIAKIAKI'
|
||
secretkey: 'secret123'
|
||
bucket: 'gitlab-registry-bucket-AKIAKIAKI'
|
||
region: 'your-s3-region'
|
||
regionendpoint: 'your-s3-regionendpoint'
|
||
redirect:
|
||
disable: true
|
||
cache:
|
||
blobdescriptor: inmemory
|
||
delete:
|
||
enabled: true
|
||
```
|
||
|
||
1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
||
|
||
#### Encrypted S3 buckets
|
||
|
||
You can use server-side encryption with AWS KMS for S3 buckets that have
|
||
[SSE-S3 or SSE-KMS encryption enabled by default](https://docs.aws.amazon.com/kms/latest/developerguide/services-s3.html).
|
||
Customer master keys (CMKs) and SSE-C encryption aren't supported since this requires sending the
|
||
encryption keys in every request.
|
||
|
||
For SSE-S3, you must enable the `encrypt` option in the registry settings. How you do this depends
|
||
on how you installed GitLab. Follow the instructions here that match your installation method.
|
||
|
||
For Omnibus GitLab installations:
|
||
|
||
1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
registry['storage'] = {
|
||
's3' => {
|
||
'accesskey' => 's3-access-key',
|
||
'secretkey' => 's3-secret-key-for-access-key',
|
||
'bucket' => 'your-s3-bucket',
|
||
'region' => 'your-s3-region',
|
||
'regionendpoint' => 'your-s3-regionendpoint',
|
||
'encrypt' => true
|
||
}
|
||
}
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure)
|
||
for the changes to take effect.
|
||
|
||
For installations from source:
|
||
|
||
1. Edit your registry configuration YML file:
|
||
|
||
```yaml
|
||
storage:
|
||
s3:
|
||
accesskey: 'AKIAKIAKI'
|
||
secretkey: 'secret123'
|
||
bucket: 'gitlab-registry-bucket-AKIAKIAKI'
|
||
region: 'your-s3-region'
|
||
regionendpoint: 'your-s3-regionendpoint'
|
||
encrypt: true
|
||
```
|
||
|
||
1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source)
|
||
for the changes to take effect.
|
||
|
||
### Storage limitations
|
||
|
||
Currently, there is no storage limitation, which means a user can upload an
|
||
infinite amount of Docker images with arbitrary sizes. This setting should be
|
||
configurable in future releases.
|
||
|
||
## Change the registry's internal port
|
||
|
||
The Registry server listens on localhost at port `5000` by default,
|
||
which is the address for which the Registry server should accept connections.
|
||
In the examples below we set the Registry's port to `5010`.
|
||
|
||
**Omnibus GitLab**
|
||
|
||
1. Open `/etc/gitlab/gitlab.rb` and set `registry['registry_http_addr']`:
|
||
|
||
```ruby
|
||
registry['registry_http_addr'] = "localhost:5010"
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**Installations from source**
|
||
|
||
1. Open the configuration file of your Registry server and edit the
|
||
[`http:addr`](https://docs.docker.com/registry/configuration/#http) value:
|
||
|
||
```yaml
|
||
http:
|
||
addr: localhost:5010
|
||
```
|
||
|
||
1. Save the file and restart the Registry server.
|
||
|
||
## Disable Container Registry per project
|
||
|
||
If Registry is enabled in your GitLab instance, but you don't need it for your
|
||
project, you can [disable it from your project's settings](../../user/project/settings/index.md#sharing-and-permissions).
|
||
|
||
## Use an external container registry with GitLab as an auth endpoint
|
||
|
||
If you use an external container registry, some features associated with the
|
||
container registry may be unavailable or have [inherent risks](../../user/packages/container_registry/reduce_container_registry_storage.md#use-with-external-container-registries).
|
||
|
||
For the integration to work, the external registry must be configured to
|
||
use a JSON Web Token to authenticate with GitLab. The
|
||
[external registry's runtime configuration](https://docs.docker.com/registry/configuration/#token)
|
||
**must** have the following entries:
|
||
|
||
```yaml
|
||
auth:
|
||
token:
|
||
realm: https://gitlab.example.com/jwt/auth
|
||
service: container_registry
|
||
issuer: gitlab-issuer
|
||
rootcertbundle: /root/certs/certbundle
|
||
```
|
||
|
||
Without these entries, the registry logins cannot authenticate with GitLab.
|
||
GitLab also remains unaware of
|
||
[nested image names](../../user/packages/container_registry/#image-naming-convention)
|
||
under the project hierarchy, like
|
||
`registry.example.com/group/project/image-name:tag` or
|
||
`registry.example.com/group/project/my/image-name:tag`, and only recognizes
|
||
`registry.example.com/group/project:tag`.
|
||
|
||
**Omnibus GitLab**
|
||
|
||
You can use GitLab as an auth endpoint with an external container registry.
|
||
|
||
1. Open `/etc/gitlab/gitlab.rb` and set necessary configurations:
|
||
|
||
```ruby
|
||
gitlab_rails['registry_enabled'] = true
|
||
gitlab_rails['registry_api_url'] = "https://<external_registry_host>:5000"
|
||
gitlab_rails['registry_issuer'] = "gitlab-issuer"
|
||
```
|
||
|
||
- `gitlab_rails['registry_enabled'] = true` is needed to enable GitLab
|
||
Container Registry features and authentication endpoint. The GitLab bundled
|
||
Container Registry service does not start, even with this enabled.
|
||
- `gitlab_rails['registry_api_url'] = "http://<external_registry_host>:5000"`
|
||
must be changed to match the host where Registry is installed.
|
||
It must also specify `https` if the external registry is
|
||
configured to use TLS. Read more on the
|
||
[Docker registry documentation](https://docs.docker.com/registry/deploying/).
|
||
|
||
1. A certificate-key pair is required for GitLab and the external container
|
||
registry to communicate securely. You need to create a certificate-key
|
||
pair, configuring the external container registry with the public
|
||
certificate (`rootcertbundle`) and configuring GitLab with the private key.
|
||
To do that, add the following to `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
# registry['internal_key'] should contain the contents of the custom key
|
||
# file. Line breaks in the key file should be marked using `\n` character
|
||
# Example:
|
||
registry['internal_key'] = "---BEGIN RSA PRIVATE KEY---\nMIIEpQIBAA\n"
|
||
|
||
# Optionally define a custom file for Omnibus GitLab to write the contents
|
||
# of registry['internal_key'] to.
|
||
gitlab_rails['registry_key_path'] = "/custom/path/to/registry-key.key"
|
||
```
|
||
|
||
Each time reconfigure is executed, the file specified at `registry_key_path`
|
||
gets populated with the content specified by `internal_key`. If
|
||
no file is specified, Omnibus GitLab defaults it to
|
||
`/var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key` and populates
|
||
it.
|
||
|
||
1. To change the container registry URL displayed in the GitLab Container
|
||
Registry pages, set the following configurations:
|
||
|
||
```ruby
|
||
gitlab_rails['registry_host'] = "registry.gitlab.example.com"
|
||
gitlab_rails['registry_port'] = "5005"
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure)
|
||
for the changes to take effect.
|
||
|
||
**Installations from source**
|
||
|
||
1. Open `/home/git/gitlab/config/gitlab.yml`, and edit the configuration settings under `registry`:
|
||
|
||
```yaml
|
||
## Container Registry
|
||
|
||
registry:
|
||
enabled: true
|
||
host: "registry.gitlab.example.com"
|
||
port: "5005"
|
||
api_url: "https://<external_registry_host>:5000"
|
||
path: /var/lib/registry
|
||
key: /path/to/keyfile
|
||
issuer: gitlab-issuer
|
||
```
|
||
|
||
[Read more](#enable-the-container-registry) about what these parameters mean.
|
||
|
||
1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
||
|
||
## Configure Container Registry notifications
|
||
|
||
You can configure the Container Registry to send webhook notifications in
|
||
response to events happening within the registry.
|
||
|
||
Read more about the Container Registry notifications configuration options in the
|
||
[Docker Registry notifications documentation](https://docs.docker.com/registry/notifications/).
|
||
|
||
You can configure multiple endpoints for the Container Registry.
|
||
|
||
**Omnibus GitLab installations**
|
||
|
||
To configure a notification endpoint in Omnibus:
|
||
|
||
1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
registry['notifications'] = [
|
||
{
|
||
'name' => 'test_endpoint',
|
||
'url' => 'https://gitlab.example.com/notify',
|
||
'timeout' => '500ms',
|
||
'threshold' => 5,
|
||
'backoff' => '1s',
|
||
'headers' => {
|
||
"Authorization" => ["AUTHORIZATION_EXAMPLE_TOKEN"]
|
||
}
|
||
}
|
||
]
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**Installations from source**
|
||
|
||
Configuring the notification endpoint is done in your registry configuration YML file created
|
||
when you [deployed your Docker registry](https://docs.docker.com/registry/deploying/).
|
||
|
||
Example:
|
||
|
||
```yaml
|
||
notifications:
|
||
endpoints:
|
||
- name: alistener
|
||
disabled: false
|
||
url: https://my.listener.com/event
|
||
headers: <http.Header>
|
||
timeout: 500
|
||
threshold: 5
|
||
backoff: 1000
|
||
```
|
||
|
||
## Run the Cleanup policy now
|
||
|
||
WARNING:
|
||
If you're using a distributed architecture and Sidekiq is running on a different node, the cleanup
|
||
policies don't work. To fix this, you must configure the `gitlab.rb` file on the Sidekiq nodes to
|
||
point to the correct registry URL and copy the `registry.key` file to each Sidekiq node. For more
|
||
information, see the [Sidekiq configuration](../sidekiq.md)
|
||
page.
|
||
|
||
To reduce the amount of [Container Registry disk space used by a given project](../troubleshooting/gitlab_rails_cheat_sheet.md#registry-disk-space-usage-by-project),
|
||
administrators can clean up image tags
|
||
and [run garbage collection](#container-registry-garbage-collection).
|
||
|
||
To remove image tags by running the cleanup policy, run the following commands in the
|
||
[GitLab Rails console](../troubleshooting/navigating_gitlab_via_rails_console.md):
|
||
|
||
```ruby
|
||
# Numeric ID of the project whose container registry should be cleaned up
|
||
P = <project_id>
|
||
|
||
# Numeric ID of a user with Developer, Maintainer, or Owner role for the project
|
||
U = <user_id>
|
||
|
||
# Get required details / objects
|
||
user = User.find_by_id(U)
|
||
project = Project.find_by_id(P)
|
||
policy = ContainerExpirationPolicy.find_by(project_id: P)
|
||
|
||
# Loop through each container repository
|
||
project.container_repositories.find_each do |repo|
|
||
puts repo.attributes
|
||
|
||
# Start the tag cleanup
|
||
puts Projects::ContainerRepository::CleanupTagsService.new(repo, user, policy.attributes.except("created_at", "updated_at")).execute()
|
||
end
|
||
```
|
||
|
||
You can also [run cleanup on a schedule](../../user/packages/container_registry/reduce_container_registry_storage.md#cleanup-policy).
|
||
|
||
## Container Registry garbage collection
|
||
|
||
NOTE:
|
||
Retention policies within your object storage provider, such as Amazon S3 Lifecycle, may prevent
|
||
objects from being properly deleted.
|
||
|
||
Container Registry can use considerable amounts of disk space. To clear up
|
||
some unused layers, the registry includes a garbage collect command.
|
||
|
||
GitLab offers a set of APIs to manipulate the Container Registry and aid the process
|
||
of removing unused tags. Currently, this is exposed using the API, but in the future,
|
||
these controls should migrate to the GitLab interface.
|
||
|
||
Users who have the [Maintainer role](../../user/permissions.md) for the project can
|
||
[delete Container Registry tags in bulk](../../api/container_registry.md#delete-registry-repository-tags-in-bulk)
|
||
periodically based on their own criteria, however, this alone does not recycle data,
|
||
it only unlinks tags from manifests and image blobs. To recycle the Container
|
||
Registry data in the whole GitLab instance, you can use the built-in command
|
||
provided by `gitlab-ctl`.
|
||
|
||
Prerequisites:
|
||
|
||
- You must have installed GitLab by using an Omnibus package or the
|
||
[cloud native chart](https://docs.gitlab.com/charts/charts/registry/#garbage-collection).
|
||
- You must set the Registry to [read-only mode](#performing-garbage-collection-without-downtime).
|
||
Running garbage collection causes downtime for the Container Registry. When you run this command
|
||
on an instance in an environment where another instances is still writing to the Registry storage,
|
||
referenced manifests are removed.
|
||
|
||
### Understanding the content-addressable layers
|
||
|
||
Consider the following example, where you first build the image:
|
||
|
||
```shell
|
||
# This builds a image with content of sha256:111111
|
||
docker build -t my.registry.com/my.group/my.project:latest .
|
||
docker push my.registry.com/my.group/my.project:latest
|
||
```
|
||
|
||
Now, you do overwrite `:latest` with a new version:
|
||
|
||
```shell
|
||
# This builds a image with content of sha256:222222
|
||
docker build -t my.registry.com/my.group/my.project:latest .
|
||
docker push my.registry.com/my.group/my.project:latest
|
||
```
|
||
|
||
Now, the `:latest` tag points to manifest of `sha256:222222`. However, due to
|
||
the architecture of registry, this data is still accessible when pulling the
|
||
image `my.registry.com/my.group/my.project@sha256:111111`, even though it is
|
||
no longer directly accessible via the `:latest` tag.
|
||
|
||
### Recycling unused tags
|
||
|
||
Before you run the built-in command, note the following:
|
||
|
||
- The built-in command stops the registry before it starts the garbage collection.
|
||
- The garbage collect command takes some time to complete, depending on the
|
||
amount of data that exists.
|
||
- If you changed the location of registry configuration file, you must
|
||
specify its path.
|
||
- After the garbage collection is done, the registry should start automatically.
|
||
|
||
If you did not change the default location of the configuration file, run:
|
||
|
||
```shell
|
||
sudo gitlab-ctl registry-garbage-collect
|
||
```
|
||
|
||
This command takes some time to complete, depending on the amount of
|
||
layers you have stored.
|
||
|
||
If you changed the location of the Container Registry `config.yml`:
|
||
|
||
```shell
|
||
sudo gitlab-ctl registry-garbage-collect /path/to/config.yml
|
||
```
|
||
|
||
You may also [remove all untagged manifests and unreferenced layers](#removing-untagged-manifests-and-unreferenced-layers),
|
||
although this is a way more destructive operation, and you should first
|
||
understand the implications.
|
||
|
||
### Removing untagged manifests and unreferenced layers
|
||
|
||
WARNING:
|
||
This is a destructive operation.
|
||
|
||
The GitLab Container Registry follows the same default workflow as Docker Distribution:
|
||
retain untagged manifests and all layers, even ones that are not referenced directly. All content
|
||
can be accessed by using context addressable identifiers.
|
||
|
||
However, in most workflows, you don't care about untagged manifests and old layers if they are not directly
|
||
referenced by a tagged manifest. The `registry-garbage-collect` command supports the
|
||
`-m` switch to allow you to remove all unreferenced manifests and layers that are
|
||
not directly accessible via `tag`:
|
||
|
||
```shell
|
||
sudo gitlab-ctl registry-garbage-collect -m
|
||
```
|
||
|
||
Since this is a way more destructive operation, this behavior is disabled by default.
|
||
You are likely expecting this way of operation, but before doing that, ensure
|
||
that you have backed up all registry data.
|
||
|
||
When the command is used without the `-m` flag, the Container Registry only removes layers that are not referenced by any manifest, tagged or not.
|
||
|
||
### Performing garbage collection without downtime
|
||
|
||
You can perform garbage collection without stopping the Container Registry by putting
|
||
it in read-only mode and by not using the built-in command. On large instances
|
||
this could require Container Registry to be in read-only mode for a while.
|
||
During this time,
|
||
you are able to pull from the Container Registry, but you are not able to
|
||
push.
|
||
|
||
By default, the [registry storage path](#configure-storage-for-the-container-registry)
|
||
is `/var/opt/gitlab/gitlab-rails/shared/registry`.
|
||
|
||
To enable the read-only mode:
|
||
|
||
1. In `/etc/gitlab/gitlab.rb`, specify the read-only mode:
|
||
|
||
```ruby
|
||
registry['storage'] = {
|
||
'filesystem' => {
|
||
'rootdirectory' => "<your_registry_storage_path>"
|
||
},
|
||
'maintenance' => {
|
||
'readonly' => {
|
||
'enabled' => true
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
1. Save and reconfigure GitLab:
|
||
|
||
```shell
|
||
sudo gitlab-ctl reconfigure
|
||
```
|
||
|
||
This command sets the Container Registry into the read-only mode.
|
||
|
||
1. Next, trigger one of the garbage collect commands:
|
||
|
||
```shell
|
||
# Recycling unused tags
|
||
sudo /opt/gitlab/embedded/bin/registry garbage-collect /var/opt/gitlab/registry/config.yml
|
||
|
||
# Removing unused layers not referenced by manifests
|
||
sudo /opt/gitlab/embedded/bin/registry garbage-collect -m /var/opt/gitlab/registry/config.yml
|
||
```
|
||
|
||
This command starts the garbage collection, which might take some time to complete.
|
||
|
||
1. Once done, in `/etc/gitlab/gitlab.rb` change it back to read-write mode:
|
||
|
||
```ruby
|
||
registry['storage'] = {
|
||
'filesystem' => {
|
||
'rootdirectory' => "<your_registry_storage_path>"
|
||
},
|
||
'maintenance' => {
|
||
'readonly' => {
|
||
'enabled' => false
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
1. Save and reconfigure GitLab:
|
||
|
||
```shell
|
||
sudo gitlab-ctl reconfigure
|
||
```
|
||
|
||
### Running the garbage collection on schedule
|
||
|
||
Ideally, you want to run the garbage collection of the registry regularly on a
|
||
weekly basis at a time when the registry is not being in-use.
|
||
The simplest way is to add a new crontab job that it runs periodically
|
||
once a week.
|
||
|
||
Create a file under `/etc/cron.d/registry-garbage-collect`:
|
||
|
||
```shell
|
||
SHELL=/bin/sh
|
||
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
|
||
|
||
# Run every Sunday at 04:05am
|
||
5 4 * * 0 root gitlab-ctl registry-garbage-collect
|
||
```
|
||
|
||
You may want to add the `-m` flag to [remove untagged manifests and unreferenced layers](#removing-untagged-manifests-and-unreferenced-layers).
|
||
|
||
### Stop garbage collection
|
||
|
||
If you anticipate stopping garbage collection, you should manually run garbage collection as
|
||
described in [Performing garbage collection without downtime](#performing-garbage-collection-without-downtime).
|
||
You can then stop garbage collection by pressing <kbd>Control</kbd>+<kbd>C</kbd>.
|
||
|
||
Otherwise, interrupting `gitlab-ctl` could leave your registry service in a down state. In this
|
||
case, you must find the [garbage collection process](https://gitlab.com/gitlab-org/omnibus-gitlab/-/blob/master/files/gitlab-ctl-commands/registry_garbage_collect.rb#L26-35)
|
||
itself on the system so that the `gitlab-ctl` command can bring the registry service back up again.
|
||
|
||
Also, there's no way to save progress or results during the mark phase of the process. Only once
|
||
blobs start being deleted is anything permanent done.
|
||
|
||
## Configuring GitLab and Registry to run on separate nodes (Omnibus GitLab)
|
||
|
||
By default, package assumes that both services are running on the same node.
|
||
In order to get GitLab and Registry to run on a separate nodes, separate configuration
|
||
is necessary for Registry and GitLab.
|
||
|
||
### Configuring Registry
|
||
|
||
Below you can find configuration options you should set in `/etc/gitlab/gitlab.rb`,
|
||
for Registry to run separately from GitLab:
|
||
|
||
- `registry['registry_http_addr']`, default [set programmatically](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/libraries/registry.rb#L50). Needs to be reachable by web server (or LB).
|
||
- `registry['token_realm']`, default [set programmatically](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/libraries/registry.rb#L53). Specifies the endpoint to use to perform authentication, usually the GitLab URL.
|
||
This endpoint needs to be reachable by user.
|
||
- `registry['http_secret']`, [random string](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/libraries/registry.rb#L32). A random piece of data used to sign state that may be stored with the client to protect against tampering.
|
||
- `registry['internal_key']`, default [automatically generated](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/recipes/gitlab-rails.rb#L113-119). Contents of the key that GitLab uses to sign the tokens. They key gets created on the Registry server, but it is not used there.
|
||
- `gitlab_rails['registry_key_path']`, default [set programmatically](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/recipes/gitlab-rails.rb#L35). This is the path where `internal_key` contents are written to disk.
|
||
- `registry['internal_certificate']`, default [automatically generated](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/registry/recipes/enable.rb#L60-66). Contents of the certificate that GitLab uses to sign the tokens.
|
||
- `registry['rootcertbundle']`, default [set programmatically](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/registry/recipes/enable.rb#L60). Path to certificate. This is the path where `internal_certificate`
|
||
contents are written to disk.
|
||
- `registry['health_storagedriver_enabled']`, default [set programmatically](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-7-stable/files/gitlab-cookbooks/gitlab/libraries/registry.rb#L88). Configure whether health checks on the configured storage driver are enabled.
|
||
- `gitlab_rails['registry_issuer']`, [default value](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/attributes/default.rb#L153). This setting needs to be set the same between Registry and GitLab.
|
||
|
||
### Configuring GitLab
|
||
|
||
Below you can find configuration options you should set in `/etc/gitlab/gitlab.rb`,
|
||
for GitLab to run separately from Registry:
|
||
|
||
- `gitlab_rails['registry_enabled']`, must be set to `true`. This setting
|
||
signals to GitLab that it should allow Registry API requests.
|
||
- `gitlab_rails['registry_api_url']`, default [set programmatically](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/10-3-stable/files/gitlab-cookbooks/gitlab/libraries/registry.rb#L52). This is the Registry URL used internally that users do not need to interact with, `registry['registry_http_addr']` with scheme.
|
||
- `gitlab_rails['registry_host']`, eg. `registry.gitlab.example`. Registry endpoint without the scheme, the address that gets shown to the end user.
|
||
- `gitlab_rails['registry_port']`. Registry endpoint port, visible to the end user.
|
||
- `gitlab_rails['registry_issuer']` must match the issuer in the Registry configuration.
|
||
- `gitlab_rails['registry_key_path']`, path to the key that matches the certificate on the
|
||
Registry side.
|
||
- `gitlab_rails['internal_key']`, contents of the key that GitLab uses to sign the tokens.
|
||
|
||
## Architecture of GitLab Container Registry
|
||
|
||
The GitLab registry is what users use to store their own Docker images.
|
||
Because of that the Registry is client facing, meaning that we expose it directly
|
||
on the web server (or load balancers, LB for short).
|
||
|
||
|
||
|
||
The flow described by the diagram above:
|
||
|
||
1. A user runs `docker login registry.gitlab.example` on their client. This reaches the web server (or LB) on port 443.
|
||
1. Web server connects to the Registry backend pool (by default, using port 5000). Since the user
|
||
didn’t provide a valid token, the Registry returns a 401 HTTP code and the URL (`token_realm` from
|
||
Registry configuration) where to get one. This points to the GitLab API.
|
||
1. The Docker client then connects to the GitLab API and obtains a token.
|
||
1. The API signs the token with the registry key and hands it to the Docker client
|
||
1. The Docker client now logs in again with the token received from the API. It can now push and pull Docker images.
|
||
|
||
Reference: <https://docs.docker.com/registry/spec/auth/token/>
|
||
|
||
### Communication between GitLab and Registry
|
||
|
||
Registry doesn’t have a way to authenticate users internally so it relies on
|
||
GitLab to validate credentials. The connection between Registry and GitLab is
|
||
TLS encrypted. The key is used by GitLab to sign the tokens while the certificate
|
||
is used by Registry to validate the signature. By default, a self-signed certificate key pair is generated
|
||
for all installations. This can be overridden as needed.
|
||
|
||
GitLab interacts with the Registry using the Registry private key. When a Registry
|
||
request goes out, a new short-living (10 minutes) namespace limited token is generated
|
||
and signed with the private key.
|
||
The Registry then verifies that the signature matches the registry certificate
|
||
specified in its configuration and allows the operation.
|
||
GitLab background jobs processing (through Sidekiq) also interacts with Registry.
|
||
These jobs talk directly to Registry in order to handle image deletion.
|
||
|
||
## Troubleshooting
|
||
|
||
Before diving in to the following sections, here's some basic troubleshooting:
|
||
|
||
1. Check to make sure that the system clock on your Docker client and GitLab server have
|
||
been synchronized (for example, via NTP).
|
||
|
||
1. If you are using an S3-backed Registry, double check that the IAM
|
||
permissions and the S3 credentials (including region) are correct. See [the
|
||
sample IAM policy](https://docs.docker.com/registry/storage-drivers/s3/)
|
||
for more details.
|
||
|
||
1. Check the Registry logs (for example `/var/log/gitlab/registry/current`) and the GitLab production logs
|
||
for errors (for example `/var/log/gitlab/gitlab-rails/production.log`). You may be able to find clues
|
||
there.
|
||
|
||
### Using self-signed certificates with Container Registry
|
||
|
||
If you're using a self-signed certificate with your Container Registry, you
|
||
might encounter issues during the CI jobs like the following:
|
||
|
||
```plaintext
|
||
Error response from daemon: Get registry.example.com/v1/users/: x509: certificate signed by unknown authority
|
||
```
|
||
|
||
The Docker daemon running the command expects a cert signed by a recognized CA,
|
||
thus the error above.
|
||
|
||
While GitLab doesn't support using self-signed certificates with Container
|
||
Registry out of the box, it is possible to make it work by
|
||
[instructing the Docker daemon to trust the self-signed certificates](https://docs.docker.com/registry/insecure/#use-self-signed-certificates),
|
||
mounting the Docker daemon and setting `privileged = false` in the GitLab Runner
|
||
`config.toml` file. Setting `privileged = true` takes precedence over the Docker daemon:
|
||
|
||
```toml
|
||
[runners.docker]
|
||
image = "ruby:2.6"
|
||
privileged = false
|
||
volumes = ["/var/run/docker.sock:/var/run/docker.sock", "/cache"]
|
||
```
|
||
|
||
Additional information about this: [issue 18239](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/18239).
|
||
|
||
### `unauthorized: authentication required` when pushing large images
|
||
|
||
Example error:
|
||
|
||
```shell
|
||
docker push gitlab.example.com/myproject/docs:latest
|
||
The push refers to a repository [gitlab.example.com/myproject/docs]
|
||
630816f32edb: Preparing
|
||
530d5553aec8: Preparing
|
||
...
|
||
4b0bab9ff599: Waiting
|
||
d1c800db26c7: Waiting
|
||
42755cf4ee95: Waiting
|
||
unauthorized: authentication required
|
||
```
|
||
|
||
GitLab has a default token expiration of 5 minutes for the registry. When pushing
|
||
larger images, or images that take longer than 5 minutes to push, users may
|
||
encounter this error. On GitLab.com, the expiration time is 15 minutes.
|
||
|
||
Administrators can increase the token duration in **Admin Area > Settings >
|
||
CI/CD > Container Registry > Authorization token duration (minutes)**.
|
||
|
||
### Docker login attempt fails with: 'token signed by untrusted key'
|
||
|
||
[Registry relies on GitLab to validate credentials](#architecture-of-gitlab-container-registry)
|
||
If the registry fails to authenticate valid login attempts, you get the following error message:
|
||
|
||
```shell
|
||
# docker login gitlab.company.com:4567
|
||
Username: user
|
||
Password:
|
||
Error response from daemon: login attempt to https://gitlab.company.com:4567/v2/ failed with status: 401 Unauthorized
|
||
```
|
||
|
||
And more specifically, this appears in the `/var/log/gitlab/registry/current` log file:
|
||
|
||
```plaintext
|
||
level=info msg="token signed by untrusted key with ID: "TOKE:NL6Q:7PW6:EXAM:PLET:OKEN:BG27:RCIB:D2S3:EXAM:PLET:OKEN""
|
||
level=warning msg="error authorizing context: invalid token" go.version=go1.12.7 http.request.host="gitlab.company.com:4567" http.request.id=74613829-2655-4f96-8991-1c9fe33869b8 http.request.method=GET http.request.remoteaddr=10.72.11.20 http.request.uri="/v2/" http.request.useragent="docker/19.03.2 go/go1.12.8 git-commit/6a30dfc kernel/3.10.0-693.2.2.el7.x86_64 os/linux arch/amd64 UpstreamClient(Docker-Client/19.03.2 \(linux\))"
|
||
```
|
||
|
||
GitLab uses the contents of the certificate key pair's two sides to encrypt the authentication token
|
||
for the Registry. This message means that those contents do not align.
|
||
|
||
Check which files are in use:
|
||
|
||
- `grep -A6 'auth:' /var/opt/gitlab/registry/config.yml`
|
||
|
||
```yaml
|
||
## Container Registry Certificate
|
||
auth:
|
||
token:
|
||
realm: https://gitlab.my.net/jwt/auth
|
||
service: container_registry
|
||
issuer: omnibus-gitlab-issuer
|
||
--> rootcertbundle: /var/opt/gitlab/registry/gitlab-registry.crt
|
||
autoredirect: false
|
||
```
|
||
|
||
- `grep -A9 'Container Registry' /var/opt/gitlab/gitlab-rails/etc/gitlab.yml`
|
||
|
||
```yaml
|
||
## Container Registry Key
|
||
registry:
|
||
enabled: true
|
||
host: gitlab.company.com
|
||
port: 4567
|
||
api_url: http://127.0.0.1:5000 # internal address to the registry, is used by GitLab to directly communicate with API
|
||
path: /var/opt/gitlab/gitlab-rails/shared/registry
|
||
--> key: /var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key
|
||
issuer: omnibus-gitlab-issuer
|
||
notification_secret:
|
||
```
|
||
|
||
The output of these `openssl` commands should match, proving that the cert-key pair is a match:
|
||
|
||
```shell
|
||
openssl x509 -noout -modulus -in /var/opt/gitlab/registry/gitlab-registry.crt | openssl sha256
|
||
openssl rsa -noout -modulus -in /var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key | openssl sha256
|
||
```
|
||
|
||
If the two pieces of the certificate do not align, remove the files and run `gitlab-ctl reconfigure`
|
||
to regenerate the pair. If you have overridden the automatically generated self-signed pair with
|
||
your own certificates and have made sure that their contents align, you can delete the 'registry'
|
||
section in your `/etc/gitlab/gitlab-secrets.json` and run `gitlab-ctl reconfigure`.
|
||
|
||
### AWS S3 with the GitLab registry error when pushing large images
|
||
|
||
When using AWS S3 with the GitLab registry, an error may occur when pushing
|
||
large images. Look in the Registry log for the following error:
|
||
|
||
```plaintext
|
||
level=error msg="response completed with error" err.code=unknown err.detail="unexpected EOF" err.message="unknown error"
|
||
```
|
||
|
||
To resolve the error specify a `chunksize` value in the Registry configuration.
|
||
Start with a value between `25000000` (25MB) and `50000000` (50MB).
|
||
|
||
**For Omnibus installations**
|
||
|
||
1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
registry['storage'] = {
|
||
's3' => {
|
||
'accesskey' => 'AKIAKIAKI',
|
||
'secretkey' => 'secret123',
|
||
'bucket' => 'gitlab-registry-bucket-AKIAKIAKI',
|
||
'chunksize' => 25000000
|
||
}
|
||
}
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**For installations from source**
|
||
|
||
1. Edit `config/gitlab.yml`:
|
||
|
||
```yaml
|
||
storage:
|
||
s3:
|
||
accesskey: 'AKIAKIAKI'
|
||
secretkey: 'secret123'
|
||
bucket: 'gitlab-registry-bucket-AKIAKIAKI'
|
||
chunksize: 25000000
|
||
```
|
||
|
||
1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
||
|
||
### Supporting older Docker clients
|
||
|
||
The Docker container registry shipped with GitLab disables the schema1 manifest
|
||
by default. If you are still using older Docker clients (1.9 or older), you may
|
||
experience an error pushing images. See
|
||
[omnibus-4145](https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/4145) for more details.
|
||
|
||
You can add a configuration option for backwards compatibility.
|
||
|
||
**For Omnibus installations**
|
||
|
||
1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
registry['compatibility_schema1_enabled'] = true
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**For installations from source**
|
||
|
||
1. Edit the YML configuration file you created when you [deployed the registry](https://docs.docker.com/registry/deploying/). Add the following snippet:
|
||
|
||
```yaml
|
||
compatibility:
|
||
schema1:
|
||
enabled: true
|
||
```
|
||
|
||
1. Restart the registry for the changes to take affect.
|
||
|
||
### Docker connection error
|
||
|
||
A Docker connection error can occur when there are special characters in either the group,
|
||
project or branch name. Special characters can include:
|
||
|
||
- Leading underscore
|
||
- Trailing hyphen/dash
|
||
- Double hyphen/dash
|
||
|
||
To get around this, you can [change the group path](../../user/group/index.md#change-a-groups-path),
|
||
[change the project path](../../user/project/settings/index.md#renaming-a-repository) or change the
|
||
branch name. Another option is to create a [push rule](../../user/project/repository/push_rules.md) to prevent
|
||
this at the instance level.
|
||
|
||
### Image push errors
|
||
|
||
When getting errors or "retrying" loops in an attempt to push an image but `docker login` works fine,
|
||
there is likely an issue with the headers forwarded to the registry by NGINX. The default recommended
|
||
NGINX configurations should handle this, but it might occur in custom setups where the SSL is
|
||
offloaded to a third party reverse proxy.
|
||
|
||
This problem was discussed in a [Docker project issue](https://github.com/docker/distribution/issues/970)
|
||
and a simple solution would be to enable relative URLs in the Registry.
|
||
|
||
**For Omnibus installations**
|
||
|
||
1. Edit `/etc/gitlab/gitlab.rb`:
|
||
|
||
```ruby
|
||
registry['env'] = {
|
||
"REGISTRY_HTTP_RELATIVEURLS" => true
|
||
}
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
||
|
||
**For installations from source**
|
||
|
||
1. Edit the YML configuration file you created when you [deployed the registry](https://docs.docker.com/registry/deploying/). Add the following snippet:
|
||
|
||
```yaml
|
||
http:
|
||
relativeurls: true
|
||
```
|
||
|
||
1. Save the file and [restart GitLab](../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
||
|
||
### Enable the Registry debug server
|
||
|
||
You can use the Container Registry debug server to diagnose problems. The debug endpoint can monitor metrics and health, as well as do profiling.
|
||
|
||
WARNING:
|
||
Sensitive information may be available from the debug endpoint.
|
||
Access to the debug endpoint must be locked down in a production environment.
|
||
|
||
The optional debug server can be enabled by setting the registry debug address
|
||
in your `gitlab.rb` configuration.
|
||
|
||
```ruby
|
||
registry['debug_addr'] = "localhost:5001"
|
||
```
|
||
|
||
After adding the setting, [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) to apply the change.
|
||
|
||
Use curl to request debug output from the debug server:
|
||
|
||
```shell
|
||
curl "localhost:5001/debug/health"
|
||
curl "localhost:5001/debug/vars"
|
||
```
|
||
|
||
### Access old schema v1 Docker images
|
||
|
||
Support for the [Docker registry v1 API](https://www.docker.com/blog/registry-v1-api-deprecation/),
|
||
including [schema V1 image manifests](https://docs.docker.com/registry/spec/manifest-v2-1/),
|
||
was:
|
||
|
||
- [Deprecated in GitLab 13.7](https://about.gitlab.com/releases/2020/12/22/gitlab-13-7-released/#deprecate-pulls-that-use-v1-of-the-docker-registry-api)
|
||
- [Removed in GitLab 13.9](https://about.gitlab.com/releases/2021/02/22/gitlab-13-9-released/#deprecate-pulls-that-use-v1-of-the-docker-registry-api)
|
||
|
||
It's no longer possible to push or pull v1 images from the GitLab Container Registry.
|
||
|
||
If you had v1 images in the GitLab Container Registry, but you did not upgrade them (following the
|
||
[steps Docker recommends](https://docs.docker.com/registry/spec/deprecated-schema-v1/))
|
||
ahead of the GitLab 13.9 upgrade, these images are no longer accessible. If you try to pull them,
|
||
this error appears:
|
||
|
||
- `Error response from daemon: manifest invalid: Schema 1 manifest not supported`
|
||
|
||
For Self-Managed GitLab instances, you can regain access to these images by temporarily downgrading
|
||
the GitLab Container Registry to a version lower than `v3.0.0-gitlab`. Follow these steps to regain
|
||
access to these images:
|
||
|
||
1. Downgrade the Container Registry to [`v2.13.1-gitlab`](https://gitlab.com/gitlab-org/container-registry/-/releases/v2.13.1-gitlab).
|
||
1. Upgrade any v1 images.
|
||
1. Revert the Container Registry downgrade.
|
||
|
||
There's no need to put the registry in read-only mode during the image upgrade process. Ensure that
|
||
you are not relying on any new feature introduced since `v3.0.0-gitlab`. Such features are
|
||
unavailable during the upgrade process. See the [complete registry changelog](https://gitlab.com/gitlab-org/container-registry/-/blob/master/CHANGELOG.md)
|
||
for more information.
|
||
|
||
The following sections provide additional details about each installation method.
|
||
|
||
#### Helm chart installations
|
||
|
||
For Helm chart installations:
|
||
|
||
1. Override the [`image.tag`](https://docs.gitlab.com/charts/charts/registry/#configuration)
|
||
configuration parameter with `v2.13.1-gitlab`.
|
||
1. Restart.
|
||
1. Performing the [images upgrade](#images-upgrade)) steps.
|
||
1. Revert the `image.tag` parameter to the previous value.
|
||
|
||
No other registry configuration changes are required.
|
||
|
||
#### Omnibus installations
|
||
|
||
For Omnibus installations:
|
||
|
||
1. Temporarily replace the registry binary that ships with GitLab 13.9+ for one prior to
|
||
`v3.0.0-gitlab`. To do so, pull a previous version of the Docker image for the GitLab Container
|
||
Registry, such as `v2.13.1-gitlab`. You can then grab the `registry` binary from within this
|
||
image, located at `/bin/registry`:
|
||
|
||
```shell
|
||
id=$(docker create registry.gitlab.com/gitlab-org/build/cng/gitlab-container-registry:v2.13.1-gitlab)
|
||
docker cp $id:/bin/registry registry-2.13.1-gitlab
|
||
docker rm $id
|
||
```
|
||
|
||
1. Replace the binary embedded in the Omnibus install, located at
|
||
`/opt/gitlab/embedded/bin/registry`, with `registry-2.13.1-gitlab`. Make sure to start by backing
|
||
up the original binary embedded in Omnibus, and restore it after performing the
|
||
[image upgrade](#images-upgrade)) steps. You should [stop](https://docs.gitlab.com/omnibus/maintenance/#starting-and-stopping)
|
||
the registry service before replacing its binary and start it right after. No registry
|
||
configuration changes are required.
|
||
|
||
#### Source installations
|
||
|
||
For source installations, locate your `registry` binary and temporarily replace it with the one
|
||
obtained from `v3.0.0-gitlab`, as explained for [Omnibus installations](#omnibus-installations).
|
||
Make sure to start by backing up the original registry binary, and restore it after performing the
|
||
[images upgrade](#images-upgrade))
|
||
steps.
|
||
|
||
#### Images upgrade
|
||
|
||
Follow the [steps that Docker recommends to upgrade v1 images](https://docs.docker.com/registry/spec/deprecated-schema-v1/).
|
||
The most straightforward option is to pull those images and push them once again to the registry,
|
||
using a Docker client version above v1.12. Docker converts images automatically before pushing them
|
||
to the registry. Once done, all your v1 images should now be available as v2 images.
|
||
|
||
### Tags with an empty name
|
||
|
||
If using [AWS DataSync](https://aws.amazon.com/datasync/)
|
||
to copy the registry data to or between S3 buckets, an empty metadata object is created in the root
|
||
path of each container repository in the destination bucket. This causes the registry to interpret
|
||
such files as a tag that appears with no name in the GitLab UI and API. For more information, see
|
||
[this issue](https://gitlab.com/gitlab-org/container-registry/-/issues/341).
|
||
|
||
To fix this you can do one of two things:
|
||
|
||
- Use the AWS CLI [`rm`](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3/rm.html)
|
||
command to remove the empty objects from the root of **each** affected repository. Pay special
|
||
attention to the trailing `/` and make sure **not** to use the `--recursive` option:
|
||
|
||
```shell
|
||
aws s3 rm s3://<bucket>/docker/registry/v2/repositories/<path to repository>/
|
||
```
|
||
|
||
- Use the AWS CLI [`sync`](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3/sync.html)
|
||
command to copy the registry data to a new bucket and configure the registry to use it. This
|
||
leaves the empty objects behind.
|
||
|
||
### Advanced Troubleshooting
|
||
|
||
We use a concrete example to illustrate how to
|
||
diagnose a problem with the S3 setup.
|
||
|
||
#### Investigate a cleanup policy
|
||
|
||
If you're unsure why your cleanup policy did or didn't delete a tag, execute the policy line by line
|
||
by running the below script from the [Rails console](../../administration/operations/rails_console.md).
|
||
This can help diagnose problems with the policy.
|
||
|
||
```ruby
|
||
repo = ContainerRepository.find(<project_id>)
|
||
policy = repo.project.container_expiration_policy
|
||
|
||
tags = repo.tags
|
||
tags.map(&:name)
|
||
|
||
tags.reject!(&:latest?)
|
||
tags.map(&:name)
|
||
|
||
regex_delete = ::Gitlab::UntrustedRegexp.new("\\A#{policy.name_regex}\\z")
|
||
regex_retain = ::Gitlab::UntrustedRegexp.new("\\A#{policy.name_regex_keep}\\z")
|
||
|
||
tags.select! { |tag| regex_delete.match?(tag.name) && !regex_retain.match?(tag.name) }
|
||
|
||
tags.map(&:name)
|
||
|
||
now = DateTime.current
|
||
tags.sort_by! { |tag| tag.created_at || now }.reverse! # Lengthy operation
|
||
|
||
tags = tags.drop(policy.keep_n)
|
||
tags.map(&:name)
|
||
|
||
older_than_timestamp = ChronicDuration.parse(policy.older_than).seconds.ago
|
||
|
||
tags.select! { |tag| tag.created_at && tag.created_at < older_than_timestamp }
|
||
|
||
tags.map(&:name)
|
||
```
|
||
|
||
- The script builds the list of tags to delete (`tags`).
|
||
- `tags.map(&:name)` prints a list of tags to remove. This may be a lengthy operation.
|
||
- After each filter, check the list of `tags` to see if it contains the intended tags to destroy.
|
||
|
||
#### Unexpected 403 error during push
|
||
|
||
A user attempted to enable an S3-backed Registry. The `docker login` step went
|
||
fine. However, when pushing an image, the output showed:
|
||
|
||
```plaintext
|
||
The push refers to a repository [s3-testing.myregistry.com:5050/root/docker-test/docker-image]
|
||
dc5e59c14160: Pushing [==================================================>] 14.85 kB
|
||
03c20c1a019a: Pushing [==================================================>] 2.048 kB
|
||
a08f14ef632e: Pushing [==================================================>] 2.048 kB
|
||
228950524c88: Pushing 2.048 kB
|
||
6a8ecde4cc03: Pushing [==> ] 9.901 MB/205.7 MB
|
||
5f70bf18a086: Pushing 1.024 kB
|
||
737f40e80b7f: Waiting
|
||
82b57dbc5385: Waiting
|
||
19429b698a22: Waiting
|
||
9436069b92a3: Waiting
|
||
error parsing HTTP 403 response body: unexpected end of JSON input: ""
|
||
```
|
||
|
||
This error is ambiguous, as it's not clear whether the 403 is coming from the
|
||
GitLab Rails application, the Docker Registry, or something else. In this
|
||
case, since we know that since the login succeeded, we probably need to look
|
||
at the communication between the client and the Registry.
|
||
|
||
The REST API between the Docker client and Registry is described
|
||
[in the Docker documentation](https://docs.docker.com/registry/spec/api/). Normally, one would just
|
||
use Wireshark or tcpdump to capture the traffic and see where things went
|
||
wrong. However, since all communications between Docker clients and servers
|
||
are done over HTTPS, it's a bit difficult to decrypt the traffic quickly even
|
||
if you know the private key. What can we do instead?
|
||
|
||
One way would be to disable HTTPS by setting up an [insecure
|
||
Registry](https://docs.docker.com/registry/insecure/). This could introduce a
|
||
security hole and is only recommended for local testing. If you have a
|
||
production system and can't or don't want to do this, there is another way:
|
||
use mitmproxy, which stands for Man-in-the-Middle Proxy.
|
||
|
||
#### mitmproxy
|
||
|
||
[mitmproxy](https://mitmproxy.org/) allows you to place a proxy between your
|
||
client and server to inspect all traffic. One wrinkle is that your system
|
||
needs to trust the mitmproxy SSL certificates for this to work.
|
||
|
||
The following installation instructions assume you are running Ubuntu:
|
||
|
||
1. [Install mitmproxy](https://docs.mitmproxy.org/stable/overview-installation/).
|
||
1. Run `mitmproxy --port 9000` to generate its certificates.
|
||
Enter <kbd>CTRL</kbd>-<kbd>C</kbd> to quit.
|
||
1. Install the certificate from `~/.mitmproxy` to your system:
|
||
|
||
```shell
|
||
sudo cp ~/.mitmproxy/mitmproxy-ca-cert.pem /usr/local/share/ca-certificates/mitmproxy-ca-cert.crt
|
||
sudo update-ca-certificates
|
||
```
|
||
|
||
If successful, the output should indicate that a certificate was added:
|
||
|
||
```shell
|
||
Updating certificates in /etc/ssl/certs... 1 added, 0 removed; done.
|
||
Running hooks in /etc/ca-certificates/update.d....done.
|
||
```
|
||
|
||
To verify that the certificates are properly installed, run:
|
||
|
||
```shell
|
||
mitmproxy --port 9000
|
||
```
|
||
|
||
This command runs mitmproxy on port `9000`. In another window, run:
|
||
|
||
```shell
|
||
curl --proxy "http://localhost:9000" "https://httpbin.org/status/200"
|
||
```
|
||
|
||
If everything is set up correctly, information is displayed on the mitmproxy window and
|
||
no errors are generated by the curl commands.
|
||
|
||
#### Running the Docker daemon with a proxy
|
||
|
||
For Docker to connect through a proxy, you must start the Docker daemon with the
|
||
proper environment variables. The easiest way is to shutdown Docker (for example `sudo initctl stop docker`)
|
||
and then run Docker by hand. As root, run:
|
||
|
||
```shell
|
||
export HTTP_PROXY="http://localhost:9000"
|
||
export HTTPS_PROXY="https://localhost:9000"
|
||
docker daemon --debug
|
||
```
|
||
|
||
This command launches the Docker daemon and proxies all connections through mitmproxy.
|
||
|
||
#### Running the Docker client
|
||
|
||
Now that we have mitmproxy and Docker running, we can attempt to sign in and
|
||
push a container image. You may need to run as root to do this. For example:
|
||
|
||
```shell
|
||
docker login s3-testing.myregistry.com:5050
|
||
docker push s3-testing.myregistry.com:5050/root/docker-test/docker-image
|
||
```
|
||
|
||
In the example above, we see the following trace on the mitmproxy window:
|
||
|
||
|
||
|
||
The above image shows:
|
||
|
||
- The initial PUT requests went through fine with a 201 status code.
|
||
- The 201 redirected the client to the S3 bucket.
|
||
- The HEAD request to the AWS bucket reported a 403 Unauthorized.
|
||
|
||
What does this mean? This strongly suggests that the S3 user does not have the right
|
||
[permissions to perform a HEAD request](https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadObject.html).
|
||
The solution: check the [IAM permissions again](https://docs.docker.com/registry/storage-drivers/s3/).
|
||
Once the right permissions were set, the error goes away.
|
||
|
||
### Missing `gitlab-registry.key` prevents container repository deletion
|
||
|
||
If you disable your GitLab instance's Container Registry and try to remove a project that has
|
||
container repositories, the following error occurs:
|
||
|
||
```plaintext
|
||
Errno::ENOENT: No such file or directory @ rb_sysopen - /var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key
|
||
```
|
||
|
||
In this case, follow these steps:
|
||
|
||
1. Temporarily enable the instance-wide setting for the Container Registry in your `gitlab.rb`:
|
||
|
||
```ruby
|
||
gitlab_rails['registry_enabled'] = true
|
||
```
|
||
|
||
1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure)
|
||
for the changes to take effect.
|
||
1. Try the removal again.
|
||
|
||
If you still can't remove the repository using the common methods, you can use the
|
||
[GitLab Rails console](../troubleshooting/navigating_gitlab_via_rails_console.md)
|
||
to remove the project by force:
|
||
|
||
```ruby
|
||
# Path to the project you'd like to remove
|
||
prj = Project.find_by_full_path(<project_path>)
|
||
|
||
# The following will delete the project's container registry, so be sure to double-check the path beforehand!
|
||
if prj.has_container_registry_tags?
|
||
prj.container_repositories.each { |p| p.destroy }
|
||
end
|
||
```
|