199 lines
11 KiB
Markdown
199 lines
11 KiB
Markdown
# GitLab-Omnibus Helm Chart
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> **Note:**.
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* This chart has been tested on Google Kubernetes Engine and Azure Container Service.
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**[This chart is beta](#limitations), and is the best way to install GitLab on Kubernetes today.** A new [cloud native GitLab chart](index.md#cloud-native-gitlab-chart) is in development with increased scalability and resilience, among other benefits. Once available, the cloud native chart will be the recommended installation method for Kubernetes, and this chart will be deprecated.
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For more information on available GitLab Helm Charts, please see our [overview](index.md#chart-overview).
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This work is based partially on: https://github.com/lwolf/kubernetes-gitlab/. GitLab would like to thank Sergey Nuzhdin for his work.
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## Introduction
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This chart provides an easy way to get started with GitLab, provisioning an installation with nearly all functionality enabled. SSL is automatically provisioned via [Let's Encrypt](https://letsencrypt.org/).
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This Helm chart is in beta, and is suited for small to medium deployments. It will be deprecated by the [cloud native GitLab chart](https://gitlab.com/charts/helm.gitlab.io/blob/master/README.md) once available. Due to the significant architectural changes, migrating will require backing up data out of this instance and importing it into the new deployment.
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The deployment includes:
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- A [GitLab Omnibus](https://docs.gitlab.com/omnibus/) Pod, including Mattermost, Container Registry, and Prometheus
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- An auto-scaling [GitLab Runner](https://docs.gitlab.com/runner/) using the Kubernetes executor
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- [Redis](https://github.com/kubernetes/charts/tree/master/stable/redis)
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- [PostgreSQL](https://github.com/kubernetes/charts/tree/master/stable/postgresql)
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- [NGINX Ingress](https://github.com/kubernetes/charts/tree/master/stable/nginx-ingress)
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- Persistent Volume Claims for Data, Registry, Postgres, and Redis
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### Limitations
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* This chart is in beta, and suited for small to medium size deployments. [High Availability](https://docs.gitlab.com/ee/administration/high_availability/) and [Geo](https://docs.gitlab.com/ee/gitlab-geo/README.html) are not supported.
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* A new generation [cloud native GitLab chart](index.md#cloud-native-gitlab-chart) is in development, and will deprecate this chart. Due to the difficulty in supporting upgrades to the new architecture, migrating will require exporting data out of this instance and importing it into the new deployment. We plan to release the new chart in beta by the end of 2017.
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For more information on available GitLab Helm Charts, please see our [overview](index.md#chart-overview).
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## Prerequisites
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- _At least_ 4 GB of RAM available on your cluster. 41GB of storage and 2 CPU are also required.
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- Kubernetes 1.4+ with Beta APIs enabled
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- [Persistent Volume](https://kubernetes.io/docs/concepts/storage/persistent-volumes/) provisioner support in the underlying infrastructure
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- A [wildcard DNS entry](#networking-prerequisites), which resolves to the external IP address
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- The `kubectl` CLI installed locally and authenticated for the cluster
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- The [Helm client](https://github.com/kubernetes/helm/blob/master/docs/quickstart.md) installed locally on your machine
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### Networking Prerequisites
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This chart configures a GitLab server and Kubernetes cluster which can support dynamic [Review Apps](https://docs.gitlab.com/ee/ci/review_apps/index.html), as well as services like the integrated [Container Registry](https://docs.gitlab.com/ee/user/project/container_registry.html) and [Mattermost](https://docs.gitlab.com/omnibus/gitlab-mattermost/).
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To support the GitLab services and dynamic environments, a wildcard DNS entry is required which resolves to the [Load Balancer](#load-balancer-ip) or [External IP](#external-ip). Configuration of the DNS entry will depend upon the DNS service being used.
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#### External IP (Recommended)
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To provision an external IP on GCP and Azure, simply request a new address from the Networking section. Ensure that the region matches the region your container cluster is created in. Note, it is important that the IP is not assigned at this point in time. It will be automatically assigned once the Helm chart is installed, and assigned to the Load Balancer.
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Now that an external IP address has been allocated, ensure that the wildcard DNS entry you would like to use resolves to this IP. Please consult the documentation for your DNS service for more information on creating DNS records.
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Finally, set the `baseIP` setting to this IP address when [deploying GitLab](#configuring-and-installing-gitlab).
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#### Load Balancer IP
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If you do not specify a `baseIP`, an IP will be assigned to the Load Balancer or Ingress. You can retrieve this IP by running the following command *after* deploying GitLab:
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`kubectl get svc -w --namespace nginx-ingress nginx`
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The IP address will be displayed in the `EXTERNAL-IP` field, and should be used to configure the Wildcard DNS entry. For more information on creating a wildcard DNS entry, consult the documentation for the DNS server you are using.
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For production deployments of GitLab, we strongly recommend using an [External IP](#external-ip).
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## Configuring and Installing GitLab
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For most installations, only two parameters are required:
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- `baseDomain`: the [base domain](#networking-prerequisites) of the wildcard host entry. For example, `mycompany.io` if the wild card entry is `*.mycompany.io`.
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- `legoEmail`: Email address to use when requesting new SSL certificates from Let's Encrypt.
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Other common configuration options:
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- `baseIP`: the desired [external IP address](#external-ip-recommended)
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- `gitlab`: Choose the [desired edition](https://about.gitlab.com/products), either `ee` or `ce`. `ce` is the default.
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- `gitlabEELicense`: For Enterprise Edition, the [license](https://docs.gitlab.com/ee/user/admin_area/license.html) can be installed directly via the Chart
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- `provider`: Optimizes the deployment for a cloud provider. The default is `gke` for [Google Kubernetes Engine](https://cloud.google.com/kubernetes-engine/), with `acs` also supported for the [Azure Container Service](https://azure.microsoft.com/en-us/services/container-service/).
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For additional configuration options, consult the [values.yaml](https://gitlab.com/charts/charts.gitlab.io/blob/master/charts/gitlab-omnibus/values.yaml).
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### Choosing a different GitLab release version
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The version of GitLab installed is based on the `gitlab` setting (see [section](#choosing-gitlab-edition) above), and
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the value of the corresponding helm setting: `gitlabCEImage` or `gitabEEImage`.
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```yaml
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gitlab: CE
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gitlabCEImage: gitlab/gitlab-ce:9.5.2-ce.0
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gitlabEEImage: gitlab/gitlab-ee:9.5.2-ee.0
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```
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The different images can be found in the [gitlab-ce](https://hub.docker.com/r/gitlab/gitlab-ce/tags/) and [gitlab-ee](https://hub.docker.com/r/gitlab/gitlab-ee/tags/)
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repositories on Docker Hub.
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### Persistent storage
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> **Note:**
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If you are using a machine type with support for less than 4 attached disks, like an Azure trial, you should disable dedicated storage for Postgres and Redis.
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By default, persistent storage is enabled for GitLab and the charts it depends
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on (Redis and PostgreSQL).
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Components can have their claim size set from your `values.yaml`, along with whether to provision separate storage for Postgres and Redis.
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Basic configuration:
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```yaml
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redisImage: redis:3.2.10
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redisDedicatedStorage: true
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redisStorageSize: 5Gi
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postgresImage: postgres:9.6.3
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# If you disable postgresDedicatedStorage, you should consider bumping up gitlabRailsStorageSize
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postgresDedicatedStorage: true
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postgresStorageSize: 30Gi
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gitlabRailsStorageSize: 30Gi
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gitlabRegistryStorageSize: 30Gi
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gitlabConfigStorageSize: 1Gi
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```
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### Routing and SSL
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Ingress routing and SSL are automatically configured within this Chart. An NGINX ingress is provisioned and configured, and will route traffic to any service. SSL certificates are automatically created and configured by [kube-lego](https://github.com/kubernetes/charts/tree/master/stable/kube-lego).
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> **Note:**
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Let's Encrypt limits a single TLD to five certificate requests within a single week. This means that common DNS wildcard services like [xip.io](http://xip.io) and [nip.io](http://nip.io) are unlikely to work.
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## Installing GitLab using the Helm Chart
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> **Note:**
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You may see a temporary error message `SchedulerPredicates failed due to PersistentVolumeClaim is not bound` while storage provisions. Once the storage provisions, the pods will automatically start. This may take a couple minutes depending on your cloud provider. If the error persists, please review the [prerequisites](#prerequisites) to ensure you have enough RAM, CPU, and storage.
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Add the GitLab Helm repository and initialize Helm:
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```bash
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helm repo add gitlab https://charts.gitlab.io
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helm init
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```
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Once you have reviewed the [configuration settings](#configuring-and-installing-gitlab) you can install the chart. We recommending saving your configuration options in a `values.yaml` file for easier upgrades in the future.
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For example:
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```bash
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helm install --name gitlab -f values.yaml gitlab/gitlab-omnibus
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```
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or passing them on the command line:
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```bash
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helm install --name gitlab --set baseDomain=gitlab.io,baseIP=1.1.1.1,gitlab=ee,gitlabEELicense=$LICENSE,legoEmail=email@gitlab.com gitlab/gitlab-omnibus
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```
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## Updating GitLab using the Helm Chart
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>**Note**: If you are upgrading from a previous version to 0.1.35 or above, you will need to change the access mode values for GitLab's storage. To do this, set the following in `values.yaml` or on the CLI:
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```
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gitlabDataAccessMode=ReadWriteMany
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gitlabRegistryAccessMode=ReadWriteMany
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gitlabConfigAccessMode=ReadWriteMany
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```
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Once your GitLab Chart is installed, configuration changes and chart updates
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should be done using `helm upgrade`:
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```bash
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helm upgrade -f values.yaml gitlab gitlab/gitlab-omnibus
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```
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## Upgrading from CE to EE using the Helm Chart
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If you have installed the Community Edition using this chart, upgrading to Enterprise Edition is easy.
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If you are using a `values.yaml` file to specify the configuration options, edit the file and set `gitlab=ee`. If you would like to run a specific version of GitLab EE, set `gitlabEEImage` to be the desired GitLab [docker image](https://hub.docker.com/r/gitlab/gitlab-ee/tags/). Then you can use `helm upgrade` to update your GitLab instance to EE:
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```bash
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helm upgrade -f values.yaml gitlab gitlab/gitlab-omnibus
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```
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You can also upgrade and specify these options via the command line:
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```bash
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helm upgrade gitlab --set gitlab=ee,gitlabEEImage=gitlab/gitlab-ee:9.5.5-ee.0 gitlab/gitlab-omnibus
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```
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## Uninstalling GitLab using the Helm Chart
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To uninstall the GitLab Chart, run the following:
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```bash
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helm delete gitlab
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```
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## Troubleshooting
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### Storage errors when updating `gitlab-omnibus` versions prior to 0.1.35
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Users upgrading `gitlab-omnibus` from a version prior to 0.1.35, may see an error like: `Error: UPGRADE FAILED: PersistentVolumeClaim "gitlab-gitlab-config-storage" is invalid: spec: Forbidden: field is immutable after creation`.
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This is due to a change in the access mode for GitLab storage in version 0.1.35. To successfully upgrade, the access mode flags must be set to `ReadWriteMany` as detailed in the [update section](#updating-gitlab-using-the-helm-chart).
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[kube-srv]: https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services---service-types
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[storageclass]: https://kubernetes.io/docs/concepts/storage/persistent-volumes/#storageclasses
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