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03-setup-jenkins.md

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Set up Jenkins

Deploy Jenkins

Create a new project

oc new-project ${GUID}-jenkins --display-name "Shared Jenkins"

Create a new persistent Jenkins instance with the following requirements:

  • A persistent persistent volume claim of 4 GB.
  • Set the parameter DISABLE_ADMINISTRATIVE_MONITORS=true to turn of update checking of Jenkins plugins.
  • Set the CPU request to 500m and CPU limit to 2 cores.
  • Set the memory request to 1Gi and memory limit to 2Gi.
oc new-app jenkins-persistent --param ENABLE_OAUTH=true --param MEMORY_LIMIT=2Gi --param VOLUME_CAPACITY=4Gi --param DISABLE_ADMINISTRATIVE_MONITORS=true --as-deployment-config

oc set resources dc jenkins --limits=memory=2Gi,cpu=2 --requests=memory=1Gi,cpu=500m

Test Jenkins

To test the Jenkins deployment you will create a simple pipeline using the default maven slave. Login into Jenkins instamce via SSO using your OpenShift credentials. To get the route type

oc get route -n ${GUID}-jenkins

Check the maven agent pod configuration

Check the maven pod template with preinstalled Java and Maven, which is used to create a Jenkins slave where the sample application will be built.

  • From the Jenkins home screen, select Manage Jenkins.
  • Dismiss all warnings
  • Select Manage Nodes and Clouds → Configure Clouds
  • Select Pod Templates, next maven → Pod Template details...
  • Check that following values are set
    • Name: maven
    • Namespace: <empty>
    • Labels: maven
    • Usage: Only build jobs with label expressions matching this node
    • The name of the pod template to inherit from: <empty>
    • Containers → Container Template
      • Name: jnlp
      • Docker image: image-registry.openshift-image-registry.svc:5000/openshift/jenkins-agent-maven:latest
      • Always pull image: <Checked>
      • Working directory: /tmp
      • Command to run: <empty>
      • Arguments to pass to the command: ${computer.jnlpmac} ${computer.name}
      • Allocate pseudo-TTY: <Unchecked>
    • Near the bottom of the pod template definition (just above Delete Template).
      • Service Account: jenkins

You can also ser here the memory and cpu limits

  • Click Advanced… to open the advanced container template settings.
    • Request CPU: 1
    • Request Memory: 1Gi
    • Limit CPU: 2
    • Limit Memory: 2Gi

Maven Pod Template 1 Maven Pod Template 2

Test the maven agent pod

Using a simple pipeline, you can now test that the agent pod is working properly

  • Create a new Jenkins job Test Agent of type Pipeline and use this test pipeline:

    • Make sure the label you request matches the label from the agent definition.

      node('maven') {
  stage('Test skopeo') {
    sh("mvn -v")
    sh("java -version")
    sh("oc whoami")
  }
}
  • Run the pipeline (click Build Now)

    • In the console output you should see the output of maven and java. You can see OpenJDK 11 is used as default JDK

      + java -version
openjdk version "11.0.8" 2020-07-14 LTS

    • The openshift-tasks application requires JDK 8. To change the version go to the maven agent pod definition, next EnvVars: → Add Environment Variable

      • Key: USE_JAVA_VERSION
      • Value: java-1.8.0

      Run the pipeline again. You can see OpenJDK 8 is used now

      + java -version
openjdk version "1.8.0_262"