jenkins-config-as-code

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• Using the project
  • Integration with Kubernetes
  • Jenkins Kubernetes cloud configuration
  • Sample Pipeline that relies on Kubernetes Plugin

The purpose is to locally spin up a pre-configured Jenkins instance that uses Jenkins Kubernetes Plugin to dynamically create containers on specific namespaces for CI builds.

Using the project

• Dockerfile is used to handle the installation of all the required Plugins.
• Instructions below are for building on Kontainer8 Worker node

vagrant ssh worker

git clone https://github.com/theJaxon/jenkins-config-as-code.git

cd jenkins-config-as-code

# Create new image with plugins specified in Dockerfile pre-installed
podman build --tag jenkins-local .

# Save the image into tar file
podman save jenkins-local -o jenkins-local.tar

# Use ctr to import the image 
sudo ctr -n=k8s.io images import jenkins-local.tar

# Apply resources inside Deployment directory via Kustomize 
kustomize build Manifests | kubectl apply -f -

# Login username and password are admin

---

Integration with Kubernetes

• The current cluster setup is the same as Kontainter8 project setup
• To give Jenkins access to Spin up pods in any namespace there's a service account created, this SA gets tied to the cluster role cluster-admin
• All this is handled via kustomization.yaml
• Kustomize generates a configMap from JCasC.yaml file then the file gets mounted at /var/jenkins_home/casc_configs/JCasC.yaml
• Configuration as code file is loaded via the environment variable CASC_JENKINS_CONFIG
• Persistent Volume is created Via local-path provisioner with is the default storage class for Kontainer8

---

Jenkins Kubernetes cloud configuration

• The connection between dynamic pods and jenkins is handled via jnlp-slave
• For this a Pod template is created where the container name is jnlp, when the name changed it caused errors so it's kept as jnlp and the Pod template name is also jnlp
• The template is pre-configured via jcasc

---

Sample Pipeline that relies on Kubernetes Plugin

podTemplate(containers: [
    containerTemplate(name: 'buildah', image: 'quay.io/buildah/stable', command: 'sleep', args: '99d', privileged: true),
    containerTemplate(name: 'maven', image: 'maven:3.8.6-jdk-11', command: 'sleep', args: '99d')]
    ) {
   node(POD_LABEL) {
     stage('Compile') {
       container('maven') {
         git url: 'https://github.com/quarkusio/quarkus-quickstarts.git', branch: 'main'
           dir("getting-started"){
             sh "mvn package"
            }
          }
        }

        stage('Image Build'){
          container('buildah'){
            // https://github.com/quarkusio/quarkus-quickstarts/tree/main/getting-started
            dir("getting-started"){
              sh"""
              container=\$(buildah from --name "quarkus-container" docker.io/amazoncorretto:11)
              buildah copy \$container target/quarkus-app/lib/ /deployments/lib/
              buildah copy \$container target/quarkus-app/*.jar /deployments/
              buildah copy \$container target/quarkus-app/app/ /deployments/app/
              buildah copy \$container target/quarkus-app/quarkus/ /deployments/quarkus/
              buildah config --entrypoint "java -jar /deployments/quarkus-run.jar -Dquarkus.http.host=0.0.0.0" \$container
              buildah commit \$container 723178642448.dkr.ecr.us-east-1.amazonaws.com/quarkus:latest
              buildah images
              buildah login -u AWS -p ${LOGIN_TOKEN} 723178642448.dkr.ecr.us-east-1.amazonaws.com
              buildah push 723178642448.dkr.ecr.us-east-1.amazonaws.com/quarkus:latest
              """
            }
          }
        }
   }
}