670 lines
21 KiB
Markdown
670 lines
21 KiB
Markdown
# GitLab Container Registry administration
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> **Notes:**
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> - [Introduced][ce-4040] in GitLab 8.8.
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> - Container Registry manifest `v1` support was added in GitLab 8.9 to support
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> Docker versions earlier than 1.10.
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> - This document is about the admin guide. To learn how to use GitLab Container
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> Registry [user documentation](../user/project/container_registry.md).
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With the Container Registry integrated into GitLab, every project can have its
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own space to store its Docker images.
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You can read more about the Container Registry at
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<https://docs.docker.com/registry/introduction/>.
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## Enable the Container Registry
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**Omnibus GitLab installations**
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All you have to do is configure the domain name under which the Container
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Registry will listen to. Read
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[#container-registry-domain-configuration](#container-registry-domain-configuration)
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and pick one of the two options that fits your case.
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>**Note:**
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The container registry works under HTTPS by default. Using HTTP is possible
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but not recommended and out of the scope of this document.
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Read the [insecure Registry documentation][docker-insecure] if you want to
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implement this.
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---
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**Installations from source**
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If you have installed GitLab from source:
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1. You will have to [install Registry][registry-deploy] by yourself.
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1. After the installation is complete, you will have to configure the Registry's
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settings in `gitlab.yml` in order to enable it.
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1. Use the sample NGINX configuration file that is found under
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[`lib/support/nginx/registry-ssl`][registry-ssl] and edit it to match the
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`host`, `port` and TLS certs paths.
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The contents of `gitlab.yml` are:
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```
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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 will run and the users will be able to use. |
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| `port` | The port under which the external Registry domain will listen on. |
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| `api_url` | The internal API URL under which the Registry is exposed to. It defaults to `http://localhost:5000`. |
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| `key` | The private key location that is a pair of Registry's `rootcertbundle`. Read the [token auth configuration documentation][token-config]. |
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| `path` | This should be the same directory like specified in Registry's `rootdirectory`. Read the [storage configuration documentation][storage-config]. This path needs to be readable by the GitLab user, the web-server user and the Registry user. Read more in [#container-registry-storage-path](#container-registry-storage-path). |
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| `issuer` | This should be the same value as configured in Registry's `issuer`. Read the [token auth configuration documentation][token-config]. |
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>**Note:**
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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] will 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][registry-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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```
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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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CAUTION: **Caution:**
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If `auth` is not set up, users will be able to 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.
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- Either [use the existing GitLab domain][existing-domain] where in that case
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the Registry will have to listen on a port and reuse GitLab's TLS certificate,
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- or [use a completely separate domain][new-domain] with a new TLS certificate
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for that domain.
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Since the container Registry requires a TLS certificate, in the end it all boils
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down to how easy or pricey is to get a new one.
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Please 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 so that you can reuse the existing GitLab TLS
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certificate.
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Assuming that the GitLab domain is `https://gitlab.example.com` and the port the
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Registry is exposed to the outside world is `4567`, 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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>**Note:**
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Be careful to choose a port different than the one that Registry listens to (`5000` by default),
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otherwise you will run into conflicts.
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---
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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:4567'
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```
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Note how 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][] for the changes to take effect.
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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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```
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registry:
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enabled: true
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host: gitlab.example.com
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port: 4567
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```
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1. Save the file and [restart GitLab][] 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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---
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Users should now be able to login to the Container Registry with their GitLab
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credentials using:
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```bash
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docker login gitlab.example.com:4567
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```
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### Configure Container Registry under its own domain
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If the Registry is configured to use its own domain, you will need a TLS
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certificate for that specific domain (e.g., `registry.example.com`) or maybe
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a wildcard certificate if hosted under a subdomain of your existing GitLab
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domain (e.g., `registry.gitlab.example.com`).
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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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---
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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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```bash
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chmod 600 /etc/gitlab/ssl/registry.gitlab.example.com.*
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```
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1. Once 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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Note how the `registry_external_url` is listening on HTTPS.
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1. Save the file and [reconfigure GitLab][] for the changes to take effect.
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> **Note:**
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If you have a [wildcard certificate][], you need to specify the path to the
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certificate in addition to the URL, in this case `/etc/gitlab/gitlab.rb` will
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look like:
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>
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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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---
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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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```
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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][] 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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---
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Users should now be able to login to the Container Registry using their GitLab
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credentials:
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```bash
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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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>**Note:**
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Disabling the Registry in the Rails GitLab application as set by the following
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steps, will not 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][] for the changes to take effect.
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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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set `enabled` to `false`:
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```
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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][] 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 will 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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---
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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][] for the changes to take effect.
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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 `default_projects_features`
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entry and configure it so that `container_registry` is set to `false`:
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```
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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][] for the changes to take effect.
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## Container Registry storage path
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>**Note:**
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For configuring storage in the cloud instead of the filesystem, see the
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[storage driver configuration](#container-registry-storage-driver).
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If you want to store your images on the filesystem, 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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> **Warning** You should confirm that all GitLab, Registry and web server users
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have access to this directory.
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---
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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][] for the changes to take effect.
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---
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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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registry:
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path: shared/registry
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```
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1. Save the file and [restart GitLab][] for the changes to take effect.
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## Container Registry storage driver
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You can configure the Container Registry to use a different storage backend by
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configuring a different storage driver. By default the GitLab Container Registry
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is configured to use the filesystem driver, which makes use of [storage path](#container-registry-storage-path)
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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 filesystem |
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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 |
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| swift | OpenStack Swift Object Storage |
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| oss | Aliyun OSS |
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Read more about the individual driver's config options in the
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[Docker Registry docs][storage-config].
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> **Warning** GitLab will not backup Docker images that are not stored on the
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filesystem. Remember to enable backups with your object storage provider if
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desired.
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>
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> **Important** Enabling storage driver other than `filesystem` would mean
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that your Docker client needs to be able to access the storage backend directly.
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So you must use an address that resolves and is accessible outside GitLab server.
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---
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**Omnibus GitLab installations**
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To configure the 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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}
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}
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```
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1. Save the file and [reconfigure GitLab][] for the changes to take effect.
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---
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**Installations from source**
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Configuring the storage driver is done in your registry config YML file created
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when you [deployed your docker registry][registry-deploy].
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Example:
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```
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storage:
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s3:
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accesskey: 'AKIAKIAKI'
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secretkey: 'secret123'
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bucket: 'gitlab-registry-bucket-AKIAKIAKI'
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region: 'your-s3-region'
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cache:
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blobdescriptor: inmemory
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delete:
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enabled: true
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```
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## Change the registry's internal port
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> **Note:**
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This is not to be confused with the port that GitLab itself uses to expose
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the Registry to the world.
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The Registry server listens on localhost at port `5000` by default,
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which is the address for which the Registry server should accept connections.
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In the examples below we set the Registry's port to `5001`.
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**Omnibus GitLab**
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1. Open `/etc/gitlab/gitlab.rb` and set `registry['registry_http_addr']`:
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```ruby
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registry['registry_http_addr'] = "localhost:5001"
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```
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1. Save the file and [reconfigure GitLab][] for the changes to take effect.
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---
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**Installations from source**
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1. Open the configuration file of your Registry server and edit the
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[`http:addr`][registry-http-config] value:
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```
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http
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addr: localhost:5001
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```
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1. Save the file and restart the Registry server.
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## Disable Container Registry per project
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If Registry is enabled in your GitLab instance, but you don't need it for your
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project, you can disable it from your project's settings. Read the user guide
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on how to achieve that.
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## Disable Container Registry but use GitLab as an auth endpoint
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**Omnibus GitLab**
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You can use GitLab as an auth endpoint and use a non-bundled Container Registry.
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1. Open `/etc/gitlab/gitlab.rb` and set necessary configurations:
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```ruby
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gitlab_rails['registry_enabled'] = true
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gitlab_rails['registry_host'] = "registry.gitlab.example.com"
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gitlab_rails['registry_port'] = "5005"
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gitlab_rails['registry_api_url'] = "http://localhost:5000"
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gitlab_rails['registry_path'] = "/var/opt/gitlab/gitlab-rails/shared/registry"
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gitlab_rails['registry_issuer'] = "omnibus-gitlab-issuer"
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```
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1. A certificate keypair is required for GitLab and the Container Registry to
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communicate securely. By default omnibus-gitlab will generate one keypair,
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which is saved to `/var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key`.
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When using a non-bundled Container Registry, you will need to supply a
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custom certificate key. To do that, add the following to
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`/etc/gitlab/gitlab.rb`
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```ruby
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gitlab_rails['registry_key_path'] = "/custom/path/to/registry-key.key"
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# registry['internal_key'] should contain the contents of the custom key
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# file. Line breaks in the key file should be marked using `\n` character
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# Example:
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registry['internal_key'] = "---BEGIN RSA PRIVATE KEY---\nMIIEpQIBAA\n"
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```
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**Note:** The file specified at `registry_key_path` gets populated with the
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content specified by `internal_key`, each time reconfigure is executed. If
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no file is specified, omnibus-gitlab will default it to
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`/var/opt/gitlab/gitlab-rails/etc/gitlab-registry.key` and will populate
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it.
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1. Save the file and [reconfigure GitLab][] 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`, and edit the configuration settings under `registry`:
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```
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## Container Registry
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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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path: /var/opt/gitlab/gitlab-rails/shared/registry
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key: /var/opt/gitlab/gitlab-rails/certificate.key
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issuer: omnibus-gitlab-issuer
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```
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1. Save the file and [restart GitLab][] for the changes to take effect.
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## Storage limitations
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Currently, there is no storage limitation, which means a user can upload an
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infinite amount of Docker images with arbitrary sizes. This setting will be
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configurable in future releases.
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## Configure Container Registry notifications
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You can configure the Container Registry to send webhook notifications in
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response to events happening within the registry.
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Read more about the Container Registry notifications config options in the
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[Docker Registry notifications documentation][notifications-config].
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>**Note:**
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Multiple endpoints can be configured for the Container Registry.
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|
|
**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][] for the changes to take effect.
|
|
|
|
---
|
|
|
|
**Installations from source**
|
|
|
|
Configuring the notification endpoint is done in your registry config YML file created
|
|
when you [deployed your docker registry][registry-deploy].
|
|
|
|
Example:
|
|
|
|
```
|
|
notifications:
|
|
endpoints:
|
|
- name: alistener
|
|
disabled: false
|
|
url: https://my.listener.com/event
|
|
headers: <http.Header>
|
|
timeout: 500
|
|
threshold: 5
|
|
backoff: 1000
|
|
```
|
|
|
|
## 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:
|
|
|
|
```
|
|
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 if you follow
|
|
[Docker's documentation][docker-insecure-self-signed]. You may find some additional
|
|
information in [issue 18239][ce-18239].
|
|
|
|
## Troubleshooting
|
|
|
|
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:
|
|
|
|
```
|
|
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][] 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][] for the changes to take effect.
|
|
|
|
[ce-18239]: https://gitlab.com/gitlab-org/gitlab-ce/issues/18239
|
|
[docker-insecure-self-signed]: https://docs.docker.com/registry/insecure/#use-self-signed-certificates
|
|
[reconfigure gitlab]: restart_gitlab.md#omnibus-gitlab-reconfigure
|
|
[restart gitlab]: restart_gitlab.md#installations-from-source
|
|
[wildcard certificate]: https://en.wikipedia.org/wiki/Wildcard_certificate
|
|
[ce-4040]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4040
|
|
[docker-insecure]: https://docs.docker.com/registry/insecure/
|
|
[registry-deploy]: https://docs.docker.com/registry/deploying/
|
|
[storage-config]: https://docs.docker.com/registry/configuration/#storage
|
|
[registry-http-config]: https://docs.docker.com/registry/configuration/#http
|
|
[registry-auth]: https://docs.docker.com/registry/configuration/#auth
|
|
[token-config]: https://docs.docker.com/registry/configuration/#token
|
|
[8-8-docs]: https://gitlab.com/gitlab-org/gitlab-ce/blob/8-8-stable/doc/administration/container_registry.md
|
|
[registry-ssl]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/support/nginx/registry-ssl
|
|
[existing-domain]: #configure-container-registry-under-an-existing-gitlab-domain
|
|
[new-domain]: #configure-container-registry-under-its-own-domain
|
|
[notifications-config]: https://docs.docker.com/registry/notifications/
|
|
[registry-notifications-config]: https://docs.docker.com/registry/configuration/#notifications
|