pipeline-with-containers-example.groovy

podTemplate(name: 'some-slave', label: 'some-slave', cloud: 'openshift', serviceAccount: 'jenkins',
    containers: [
        // This adds the custom slave container to the pod. Must be first with name 'jnlp'
        containerTemplate(name: 'jnlp', 
            image: '172.30.1.1:5000/continuous-infra/jenkins-continuous-infra-slave:latest', 
            ttyEnabled: false, 
            args: '${computer.jnlpmac} ${computer.name}', 
            command: '', 
            workingDir: '/tmp'),
            
        // This adds the rpmbuild container to the pod.
        containerTemplate(name: 'rpmbuild', 
            image: '172.30.1.1:5000/ci-containers/rpmbuild', 
            ttyEnabled: false, 
            command: '', 
            workingDir: '/tmp'),
            
    ], 
        // This mounts a volume that is accessible from containers
        volumes: [emptyDirVolume(memory: false, mountPath: '/results')]) {
    
    node('some-slave') {
        // This variable will be available in the container
        stage = "rpmbuild"
        // This variable will contain a return string from
        // the container execution
        containerReturnValue = ""
        stage(stage) {
            sh 'ls -l /results'
            container('rpmbuild') {
                // Here is the variable being passed in...
                // and we add it to a file that will be available
                // after we are done with container.
                sh '/bin/echo stage:' + stage + ' > /results/1.txt'
                // The shell step captures some output and assigns it
                // to a variable
                containerReturnValue = sh(script: 'id -u', returnStdout: true).trim()
            }
            echo "containerReturnValue: " + containerReturnValue
            sh 'ls -l /results'
            // We should see stage:rpmbuild here in 1.txt
            sh 'cat /results/1.txt'
        }
    }
}

Resulting log

[Pipeline] podTemplate
[Pipeline] {
[Pipeline] node
Running on some-slave-42583a802ba545e993e591c2b629bb06-9c40cd82e5f3 in /tmp/workspace/inline-podTemplate
[Pipeline] {
[Pipeline] stage
[Pipeline] { (rpmbuild)
[Pipeline] sh
[inline-podTemplate] Running shell script
+ ls -l /results
total 0
[Pipeline] container
[Pipeline] {
[Pipeline] sh
[inline-podTemplate] Running shell script
Executing shell script inside container [rpmbuild] of pod [some-slave-42583a802ba545e993e591c2b629bb06-9c40cd82e5f3]
+ /bin/echo stage:rpmbuild
[Pipeline] sh
[inline-podTemplate] Running shell script
Executing shell script inside container [rpmbuild] of pod [some-slave-42583a802ba545e993e591c2b629bb06-9c40cd82e5f3]
+ id -u
[Pipeline] }
[Pipeline] // container
[Pipeline] echo
containerReturnValue: 1000060000
[Pipeline] sh
[inline-podTemplate] Running shell script
+ ls -l /results
total 4
-rw-r--r-- 1 default 1000060000 15 Jul 26 17:32 1.txt
[Pipeline] sh
[inline-podTemplate] Running shell script
+ cat /results/1.txt
stage:rpmbuild
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] }
[Pipeline] // podTemplate
[Pipeline] End of Pipeline
Finished: SUCCESS