• Prerequisites
  • Cluster
  • Ingress controller
  • TLS certificates
  • Metrics
  • Configure Domain Name Services
• Installing the GitLab Operator
• Recommended next steps
• Uninstall the GitLab Operator
  • Uninstall an instance of GitLab
  • Uninstall the GitLab Operator
• Troubleshoot the GitLab Operator

Installation

This document describes how to deploy the GitLab Operator via manifests in your Kubernetes or OpenShift cluster.

If using OpenShift, these steps are typically handled by the Operator Lifecycle Manager (OLM) once an operator bundle is published. However, to test the most recent operator images, users may need to install the operator using the deployment manifests available in the operator repository.

Prerequisites

1. Create or use an existing Kubernetes or OpenShift cluster
2. Install pre-requisite services and software
   • Ingress controller
   • cert-manager
   • Metrics server
3. Configure Domain Name Services

Cluster

Cluster nodes must use the x86-64 architecture. Support for multiple architectures, including AArch64/ARM64, is under active development. See issue 2899 for more information.

Ingress controller

An Ingress controller is required to provide external access to the application and secure communication between components.

The GitLab Operator deploys our forked NGINX chart from the GitLab Helm Chart by default.

If you prefer to use an external Ingress controller, use NGINX Ingress by the Kubernetes community to deploy an Ingress Controller. Follow the relevant instructions in the link based on your platform and preferred tooling. Take note of the Ingress class value for later (it typically defaults to nginx). When configuring the GitLab CR, be sure to set nginx-ingress.enabled=false to disable the NGINX objects from the GitLab Helm Chart.

TLS certificates

To create a certificate for the operator’s Kubernetes webhook, cert-manager is used. You should use cert-manager for the GitLab certificates as well.

Because the operator needs a certificate for the Kubernetes webhook, you can’t use the cert-manager bundled with the GitLab Chart. Instead, install cert-manager before you install the operator.

To install cert-manager, see the installation documentation for your platform and tooling.

Our codebase targets cert-manager 1.6.1.

Metrics

Configure Domain Name Services

You need an internet-accessible domain to which you can add a DNS record.

See our networking and DNS documentation for more details on connecting your domain to the GitLab components. You use the configuration mentioned in this section when defining your GitLab custom resource (CR).

Ingress in OpenShift requires extra consideration. See our notes on OpenShift Ingress for more information.

Installing the GitLab Operator

1. Deploy the GitLab Operator.

   GL_OPERATOR_VERSION=<your_desired_version> # https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/releases
   PLATFORM=kubernetes # or "openshift"
   kubectl create namespace gitlab-system
   kubectl apply -f https://gitlab.com/api/v4/projects/18899486/packages/generic/gitlab-operator/${GL_OPERATOR_VERSION}/gitlab-operator-${PLATFORM}-${GL_OPERATOR_VERSION}.yaml
   

   This command first deploys the service accounts, roles and role bindings used by the operator, and then the operator itself.

   By default, the Operator watches the namespace where it is deployed. To instead watch at the cluster scope, remove the WATCH_NAMESPACE environment variable from the Deployment in the manifest under: spec.template.spec.containers[0].env and re-run the kubectl apply command above.

   Running the Operator at the cluster scope is considered experimental. See issue #100 for more information.

   Experimental: Alternatively, deploy the GitLab Operator via Helm.

   helm repo add gitlab-operator https://gitlab.com/api/v4/projects/18899486/packages/helm/stable
   helm repo update
   helm install gitlab-operator gitlab-operator/gitlab-operator --create-namespace --namespace gitlab-system
   

2. Create a GitLab custom resource (CR).

   Create a new file named something like mygitlab.yaml.

   Here is an example of the content to put in this file:

   apiVersion: apps.gitlab.com/v1beta1
   kind: GitLab
   metadata:
     name: gitlab
   spec:
     chart:
       version: "X.Y.Z" # https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/blob/0.8.1/CHART_VERSIONS
       values:
         global:
           hosts:
             domain: example.com # use a real domain here
           ingress:
             configureCertmanager: true
         certmanager-issuer:
           email: youremail@example.com # use your real email address here
   

   For more details on configuration options to use under spec.chart.values, see the GitLab Helm Chart documentation.

3. Deploy a GitLab instance using your new GitLab CR.

   kubectl -n gitlab-system apply -f mygitlab.yaml
   

   This command sends your GitLab CR up to the cluster for the GitLab Operator to reconcile. You can watch the progress by tailing the logs from the controller pod:

   kubectl -n gitlab-system logs deployment/gitlab-controller-manager -c manager -f
   

   You can also list GitLab resources and check their status:

   $ kubectl -n gitlab-system get gitlab
   NAME     STATUS   VERSION
   gitlab   Ready    5.2.4
   

When the CR is reconciled (the status of the GitLab resource is Running), you can access GitLab in your browser at https://gitlab.example.com.

To log in you need to retrieve the initial root password for your deployment. See the Helm Chart documentation for further instructions.

Recommended next steps

After completing your installation, consider taking the recommended next steps, including authentication options and sign-up restrictions.

Uninstall the GitLab Operator

Follow the steps below to remove the GitLab Operator and its associated resources.

Items to note prior to uninstalling the operator:

• The operator does not delete the Persistent Volume Claims or Secrets when a GitLab instance is deleted.
• When deleting the Operator, the namespace where it is installed (gitlab-system by default) is not deleted automatically. This ensures that persistent volumes are not lost unintentionally.

Uninstall an instance of GitLab

kubectl -n gitlab-system delete -f mygitlab.yaml

This removes the GitLab instance, and all associated objects except for Persistent Volume Claims as noted above).

Uninstall the GitLab Operator

GL_OPERATOR_VERSION=<your_installed_version> # https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/releases
PLATFORM=kubernetes # or "openshift"
kubectl delete -f https://gitlab.com/api/v4/projects/18899486/packages/generic/gitlab-operator/${GL_OPERATOR_VERSION}/gitlab-operator-${PLATFORM}-${GL_OPERATOR_VERSION}.yaml

This deletes the Operator’s resources, including the running Deployment of the Operator. This does not delete objects associated with a GitLab instance.

Troubleshoot the GitLab Operator

Troubleshooting the Operator can be found in troubleshooting.md.