Jenkins: A Groovy repository from skulasekar

Create your cluster

Use your favorite cloud provider!

Install and Configure Tools

kubectl

https://kubernetes.io/docs/tasks/tools/install-kubectl/

Helm

https://helm.sh/docs/intro/install/

Tiller

helm init

Create Kubernetes Resources

Create the Jenkins namespace

kubectl create ns jenkins

Create the CasC ConfigMap

kubectl create configmap casc -n jenkins --from-file casc

Create Secret for Storage

kubectl create secret generic <secretName> --from-file=<secretFile> -n jenkins

Installing Jenkins

helm install jenkins        \       
    stable/jenkins          \
    -n jenkins              \
    -f jenkins.yaml         \
    --set master.adminUser=<admin username>,master.adminPassword=<admin password>

Upgrading Jenkins

Update the configuration files in casc
Update the ConfigMap kubectl create configmap casc -n jenkins --from-file casc -o yaml --dry-run | kubectl replace -f -
Apply the upgrade

helm upgrade jenkins        \
    stable/jenkins          \
    -n jenkins              \
    -f jenkins.yaml

Reload the configuration Manage Jenkins > Configuration as Code > Reload Existing Configuration

Development Notes

Things to think about:

using the --atomic or --cleanup-on-fail flags during helm deployments
configmap only takes the root level directory - no subdirectories
we need to consider how to clean up after merges
- delete namespace (includes service account and app), as well as cluster role binding for the service account
- need to implement cleanup for backup data
blue green deployment? need to think it through
known error: helm marks deployment as successfull before waiting for pods to be ready
- if CasC fails, Jenkins will stop (failed deploy) but Helm shows success
check for apply configmap

skulasekar/Jenkins