yaml
container
- multiple containerTemplate with resource limits

[!TIP|label:reference:]

kubernetes

Kubernetes plugin

kubernetes sample code

pipeline

casc

yaml

#!/usr/bin/env groovy

import groovy.transform.Field

@Field final String CLUSTER = 'DevOps Kubernetes'
@Field final String NAMESPACE = 'devops'
String label = env.BUILD_TAG

ansiColor('xterm') { timestamps {
  podTemplate(
    label: label ,
    cloud: CLUSTER ,
    namespace: NAMESPACE ,
    showRawYaml: true,
    yaml: """
      apiVersion: v1
      kind: Pod
      metadata:
        labels:
          jenkins: jnlp-inbound-agent
      spec:
        hostNetwork: true
        nodeSelector:
          <label_name>: "<value>"
        containers:
        - name: jnlp
          image: jenkins/inbound-agent:latest
          workingDir: /home/jenkins
          tty: true
    """
  ) { node (label) { container(name:'jnlp', shell:'/bin/bash') {
      stage('prepare') {
        sh """
          whoami
          pwd
          realpath ${WORKSPACE}
        """
      } // stage
  }}} // container | node | podTemplate
}} // timestamp | ansiColor

// vim: ft=Jenkinsfile ts=2 sts=2 sw=2 et

with resources

#!/usr/bin/env groovy

import groovy.transform.Field

@Field final String CLUSTER = 'Jenkins Kubernetes'
@Field final String NAMESPACE = 'jenkins'
String label = env.BUILD_TAG

ansiColor('xterm') { timestamps {
  podTemplate(
    label: label ,
    cloud: CLUSTER ,
    namespace: NAMESPACE ,
    showRawYaml: true,
    yaml: """
      apiVersion: v1
      kind: Pod
      metadata:
        labels:
          jenkins: jnlp-inbound-agent
      spec:
        hostNetwork: true
        nodeSelector:
          <label_name>: "<value>"
        containers:
        - name: jnlp
          image: jenkins/inbound-agent:latest
          workingDir: /home/jenkins
          tty: true
          resources:
            limits:
              memory: 1Gi
              cpu: 1
            requests:
              memory: 500Mi
              cpu: 0.5
    """
  ) { node (label) { container(name:'jnlp', shell:'/bin/bash') {
      stage('prepare') {
        sh """
          whoami
          pwd
        """
      } // stage
  }}} // container | node | podTemplate
}} // timestamp | ansiColor

// vim: ft=Jenkinsfile ts=2 sts=2 sw=2 et

with `POD_LABEL`

#!/usr/bin/env groovy

import groovy.transform.Field

@Field final String CLUSTER = 'Jenkins Kubernetes'
@Field final String NAMESPACE = 'jenkins'

ansiColor('xterm') { timestamps {
  podTemplate(
    cloud: CLUSTER ,
    namespace: NAMESPACE ,
    showRawYaml: true,
    yaml: """
      apiVersion: v1
      kind: Pod
      metadata:
        labels:
          jenkins: jnlp-inbound-agent
      spec:
        hostNetwork: true
        nodeSelector:
          <label_name>: "<value>"
        containers:
        - name: jnlp
          image: jenkins/inbound-agent:latest
          workingDir: /home/jenkins
          tty: true
          resources:
            limits:
              memory: 1Gi
              cpu: 1
            requests:
              memory: 500Mi
              cpu: 0.5
    """
  ) { node (POD_LABEL) { container(name:'jnlp', shell:'/bin/bash') {
      stage('prepare') {
        sh """
          whoami
          pwd
          ls -Altrh /home/
          ls -Altrh /home/jenkins/
          touch a.txt
          realpath ${WORKSPACE}
          realpath a.txt
        """
      } // stage
  }}} // container | node | podTemplate
}} // timestamp | ansiColor

// vim: ft=Jenkinsfile ts=2 sts=2 sw=2 et

default yaml

podTemplate(cloud: 'DevOps Kubernetes') {
  node(POD_LABEL) {
    stage('Run shell') {
      sh 'echo hello world'
    }
  }
}

windows (kubernetes)

/*
 * Runs a build on a Windows pod.
 * Tested in EKS: https://docs.aws.amazon.com/eks/latest/userguide/windows-support.html
 */
podTemplate(yaml: '''
apiVersion: v1
kind: Pod
spec:
  containers:
  - name: jnlp
    image: jenkins/inbound-agent:windowsservercore-1809
  - name: shell
    image: mcr.microsoft.com/powershell:preview-windowsservercore-1809
    command:
    - powershell
    args:
    - Start-Sleep
    - 999999
  nodeSelector:
    kubernetes.io/os: windows
''') {
    node(POD_LABEL) {
        container('shell') {
            powershell 'Get-ChildItem Env: | Sort Name'
        }
    }
}

maven (kubernetes)

// Build a Maven project using the standard image and Scripted syntax.
// Rather than inline YAML, you could use: yaml: readTrusted('jenkins-pod.yaml')
// Or, to avoid YAML: containers: [containerTemplate(name: 'maven', image: 'maven:3.6.3-jdk-8', command: 'sleep', args: 'infinity')]
podTemplate(yaml: '''
apiVersion: v1
kind: Pod
spec:
  containers:
  - name: maven
    image: maven:3.6.3-jdk-8
    command:
    - sleep
    args:
    - infinity
''') {
    node(POD_LABEL) {
        // or, for example: git 'https://github.com/jglick/simple-maven-project-with-tests'
        writeFile file: 'pom.xml', text: '''
<project xmlns="http://maven.apache.org/POM/4.0.0">
    <modelVersion>4.0.0</modelVersion>
    <groupId>sample</groupId>
    <artifactId>sample</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.18.1</version>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
</project>
        '''
        writeFile file: 'src/test/java/sample/SomeTest.java', text: '''
package sample;
public class SomeTest {
    @org.junit.Test
    public void checks() {}
}
        '''
        container('maven') {
            sh 'mvn -B -ntp -Dmaven.test.failure.ignore verify'
        }
        junit '**/target/surefire-reports/TEST-*.xml'
        archiveArtifacts '**/target/*.jar'
    }
}

container

podTemplate(cloud: 'DevOps Kubernetes', containers: [
  containerTemplate(
    name: 'jnlp',
    image: 'jenkins/inbound-agent:latest',
    ttyEnabled: true,
    privileged: false,
    alwaysPullImage: false,
    workingDir: '/home/jenkins'
  )
]) { node(POD_LABEL) {
    stage ('run') {
      echo 'yes!'
      sh """
        id
        whoami
        echo ${WORKSPACE}
        realpath ${WORKSPACE}
      """
    }
}}

multiple containerTemplate with resource limits

[!NOTE|label:add memory and cpu resources in containerTemplate:]

Changing container memory and cpu limits
zh jenkins-kubernetes-plugin
Kubernetes plugin

TIPS

the jnlp container template will be enabled by default, however it contains only requests:

---
apiVersion: "v1"
kind: "Pod"
metadata:
  annotations:
    buildUrl: "https://jenkins.domain.com/job/devops/job/demo/job/container/7/"
    runUrl: "job/devops/job/demo/job/container/7/"
  labels:
    jenkins: "slave"
    jenkins/label-digest: "a170798a479a410811c24bd8c3bacac0dd709dff"
    jenkins/label: "devops_demo_container_7-7gfwb"
  name: "devops-demo-container-7-7gfwb-tjkzm-kfn2m"
  namespace: "marslo-test"
spec:
  containers:
  - command:
    - "cat"
    image: "maven:3.3.9-jdk-8-alpine"
    imagePullPolicy: "IfNotPresent"
    name: "maven"
    resources:
      limits:
        memory: "1024Mi"
        cpu: "512m"
      requests:
        memory: "512Mi"
        cpu: "256m"
    tty: true
    volumeMounts:
    - mountPath: "/home/jenkins/agent"
      name: "workspace-volume"
      readOnly: false
  - command:
    - "cat"
    image: "golang:1.8.0"
    imagePullPolicy: "IfNotPresent"
    name: "golang"
    resources:
      limits:
        memory: "1024Mi"
        cpu: "512m"
      requests:
        memory: "512Mi"
        cpu: "256m"
    tty: true
    volumeMounts:
    - mountPath: "/home/jenkins/agent"
      name: "workspace-volume"
      readOnly: false
  - env:
    - name: "JENKINS_SECRET"
      value: "********"
    - name: "JENKINS_AGENT_NAME"
      value: "devops-demo-container-7-7gfwb-tjkzm-kfn2m"
    - name: "JENKINS_WEB_SOCKET"
      value: "true"
    - name: "JENKINS_NAME"
      value: "devops-demo-container-7-7gfwb-tjkzm-kfn2m"
    - name: "JENKINS_AGENT_WORKDIR"
      value: "/home/jenkins/agent"
    - name: "JENKINS_URL"
      value: "https://jenkins.domain.com/"
    image: "jenkins/inbound-agent:3206.vb_15dcf73f6a_9-2"
    name: "jnlp"
    resources:
      requests:
        memory: "256Mi"
        cpu: "100m"
    volumeMounts:
    - mountPath: "/home/jenkins/agent"
      name: "workspace-volume"
      readOnly: false
  nodeSelector:
    jenkins.builder/loc: "dc5"
  restartPolicy: "Never"
  volumes:
  - emptyDir:
      medium: ""
    name: "workspace-volume"

podTemplate( cloud: 'DevOps Kubernetes',
             namespace: 'devops',
             nodeSelector: 'jenkins.builder/loc=dc5',
             containers: [
               containerTemplate(
                 name: 'maven',
                 image: 'maven:3.3.9-jdk-8-alpine',
                 ttyEnabled: true,
                 command: 'cat',
                 resourceRequestCpu: '256m',
                 resourceLimitCpu: '512m',
                 resourceRequestMemory: '512Mi',
                 resourceLimitMemory: '1024Mi'
               ),
               containerTemplate(
                 name: 'golang',
                 image: 'golang:1.8.0',
                 ttyEnabled: true,
                 command: 'cat',
                 resourceRequestCpu: '256m',
                 resourceLimitCpu: '512m',
                 resourceRequestMemory: '512Mi',
                 resourceLimitMemory: '1024Mi'
               ),
               containerTemplate(
                 name: 'jnlp',
                 image: 'jenkins/inbound-agent',
                 ttyEnabled: true,
                 resourceRequestCpu: '256m',
                 resourceLimitCpu: '512m',
                 resourceRequestMemory: '512Mi',
                 resourceLimitMemory: '1024Mi'
               )
             ]
) {
    node(POD_LABEL) {
      stage('maven') {
        container('maven') {
          sh """ which -a mvn """
        }
      }
      stage('golang') {
        container('golang') {
          sh """ which -a go """
        }
      }
    }
}

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