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Gitlab for CI/CD

In this lab we will install Gitlab to the shared cluster via a Helm chart. The following modifications to the default chart values need to be made:

  • Use Contour Ingress
  • Generate certificate via Let's Encrypt
  • Updated URLs
  • Scaled down Gitlab resources

Gitlab will also be managed via Tanzu Mission Control in a dedicated workspace.

Set environment variables

The following section should be added to or exist in your local params.yaml file:

gitlab:
  namespace: gitlab
  tmc-workspace: gitlab-workspace

Once these are in place and correct, run the following to export the following into your shell:

export TMC_CLUSTER_GROUP=$(yq r params.yaml tmc.cluster-group)
export GITLAB_NAMESPACE=$(yq r params.yaml gitlab.namespace)
export GITLAB_TMC_WORKSPACE=$TMC_CLUSTER_GROUP-$(yq r params.yaml gitlab.tmc-workspace)
export CLUSTER_NAME=$(yq r params.yaml shared-services-cluster.name)
export IAAS=$(yq r params.yaml iaas)
export VMWARE_ID=$(yq r params.yaml vmware-id)

Create Gitlab namespace and prepare deployment file

In order to deploy the Helm chart for Gitlab to a dedicated namespace, we need to create it first. To do this, we can use Tanzu Mission Control, as it is already running on our shared services cluster. This will create a "managed namespace", where we can assert additional control over what is deployed.

NOTE: if you want to avoid using TMC, simply create the namespace in the shared-services cluster manually using "kubectl create namespace ${GITLAB_NAMESPACE}"

tmc workspace create -n $GITLAB_TMC_WORKSPACE -d "Workspace for Gitlab"
tmc cluster namespace create -c $VMWARE_ID-$CLUSTER_NAME-$IAAS -n $GITLAB_NAMESPACE -d "Gitlab product installation" -k $GITLAB_TMC_WORKSPACE

Generate the deployment file. This file (generated/tkg-shared/gitlab/values-gitlab.yaml) will contain oeverrides to the default chart values.

./scripts/generate-gitlab.sh

Add helm repo and install Gitlab

Add the repository to helm and use the generated deployment file to deploy the chart.

helm repo add gitlab https://charts.gitlab.io/
helm repo update
helm upgrade --install gitlab gitlab/gitlab -f generated/tkg-shared/gitlab/values-gitlab.yaml -n $GITLAB_NAMESPACE

Validation Step

Check to see if the pods, ingresses, and PVCs are up and running:

kubectl get pod,pvc,ing,cert -n gitlab
kubectl get -n gitlab secret gitlab-gitlab-initial-root-password -ojsonpath='{.data.password}' | base64 --decode ; echo

Go to the browser and use the FQDN for Gitlab to test it out.