OpenShift Origin template for GitLab Runner

his is a template for easy deployment of GitLab Runner CI into OpenShift cluster

• uses official GitLab Runner image from gitlab docker repo
• caching is implemented via official Minio Cloud Storage image from minio docker repo
• provides sane default options and simple configurator
• containers are runnning with anyuid SCC (allows to create new docker containers for CI and run them as root)
• autoupdate is enabled
• partially is based on kubernetes configs
  
  • https://docs.gitlab.com/runner/install/kubernetes.html
  • https://gitlab.com/gitlab-org/omnibus-gitlab/blob/ux-demo/docker/openshift-ci-template.json
  • http://blog.lwolf.org/post/how-to-easily-deploy-gitlab-on-kubernetes/
  • https://github.com/lwolf/kubernetes-gitlab/tree/master/minio

Prerequisites

• GitLab Runner's local token, from /etc/gitlab-runner/config.toml. That file is created after installation and registration of GitLab Runner and after running of
  

    sudo gitlab-ci-multi-runner register

  there will be file /etc/gitlab-runner/config.toml with token
  

  [[runners]]
  ...
  token = "..."
  

• OpenShift Origin (The template is tested with All-in-one cluster binary, thought it might work with Red Hat OpenShift as well
• admin access to server for setting rights for service account

Installation

1. Create new project/namespace
   

   oc login -u developer
   oc new-project prj-gitlab-runner

2. Import template
   

   oc create -f https://gitlab.com/oprudkyi/openshift-templates/raw/master/gitlab-runner/gitlab-runner.yaml -n prj-gitlab-runner

3. Setup Security Context Constraints (SCC) for service accounts used for running containers (anyuid means commands inside containers can run as root)
   

   oc login -u system:admin
   oc adm policy add-scc-to-user anyuid -z sa-gitlab-runner -n prj-gitlab-runner
   oc adm policy add-scc-to-user anyuid -z sa-minio -n prj-gitlab-runner

4. Go to web console https://MASTER-IP:8443/console/project/prj-gitlab-runner/overview (where MASTER-IP is IP where cluster is bound) and press "Add to Project" and select "gitlab-runner" template
5. Fill required fields
   
   • GitLab Runner Token : one from /etc/gitlab-runner/config.toml
   • GitLab Runners Namespace : prj-gitlab-runner
6. As well there are some additional options you may configure - docker hub tags for GitLab-Runner and Minio, login/password for Minio etc, though defaults will work as well
7. After pressing update the deployment will start, it may take few minutes to download required images and preconfigure them
8. In your Gitlab Project check "Runners" page to have runner activated
9. Run some CI job , there will be something like
   

   Waiting for pod prj-gitlab-runner/runner-86251ae3-project-1142978-concurrent-0uzqax to be running, status is Pending
   

   in log output of CI

Persistent cache in directory of your host (optional)

Minio server is not attached to any permanent storage and uses an ephemeral storage - emptyDir. When Minio Service/Pod is stopped or restarted all data will be deleted. Though, while Minio is running, cache is available locally via some path like '/var/lib/origin/openshift.local.volumes/pods/de1d0ff7-d2bb-11e6-8d5b-74d02b8fa488/volumes/kubernetes.io~empty-dir/vol-minio-data-store'
So, you may need to point vol-minio-data-store volume to persistent storage or periodically backup data.
While you can use any storage - NFC/Ceph RDB/GlusterFS and more, for simple cluster setup (with small number of nodes) host path is the simplest. Though if you have more then one Node you should mantain cleanup/sync between nodes by self.
Next steps allow to use local directory /cache/gitlab-runner as storage for Minio

1. Setup Security Context Constraints (SCC) for Minio container to access Node's filesystem
   

   oc login -u system:admin
   oc adm policy add-scc-to-user hostmount-anyuid -z sa-minio -n prj-gitlab-runner

2. Edit dc-minio-service deployment config via OpenSift Web console at https://MASTER-IP:8443/console/project/prj-gitlab-runner/edit/yaml?kind=DeploymentConfig&name=dc-minio-service or from console
   

   oc project prj-gitlab-runner
   oc edit dc/dc-minio-service

   Replace
   

       volumes:
       - emptyDir: {}
         name: vol-minio-data-store
   

   with
   

       volumes:
       - hostPath: 
           path: /cache/gitlab-runner
         name: vol-minio-data-store
   

   After saving, Minio server will be automatically restarted and you can access cache via Minio Web console http://minio-service.prj-gitlab-runner.svc.cluster.local/minio/bkt-gitlab-runner/, you can try to upload file and check if it exists at the /cache/gitlab-runner as well you can force new deploy (restart) of minio and see if it keeps files on restart

Management

• You can additionally configure gitlab runner via web console at https://MASTER-IP:8443/console/project/prj-gitlab-runner/browse/config-maps/cm-gitlab-runner , by example count of concurent jobs etc, see all possible options at GitLab Runner docs.
  Alternatively you can use console for editing:
  

  oc project prj-gitlab-runner
  oc edit configmap/cm-gitlab-runner

  After editing you will need to manually "Deploy" gitlab-runner deployment - https://MASTER-IP:8443/console/project/prj-gitlab-runner/browse/dc/dc-gitlab-runner-service or via console
  

  oc project prj-gitlab-runner
  oc deploy dc-gitlab-runner-service --latest --follow=true

• Minio Web console is available at http://minio-service.prj-gitlab-runner.svc.cluster.local/ or just grab IP under https://MASTER-IP:8443/console/project/prj-gitlab-runner/browse/services/minio-service and access/secret keys under https://MASTER-IP:8443/console/project/prj-gitlab-runner/browse/dc/dc-minio-service?tab=environment

Source : https://gitlab.com/oprudkyi/openshift-templates/tree/master/gitlab-runner
Mirror: https://github.com/oprudkyi/openshift-templates/tree/master/gitlab-runner