DevOps Classroomnotes 03/Mar/2023

Declarative Pipelines

• Jenkins has a DSL (Domain Specific Language) for creating Declarative Pipeines
• Jenkins Pipeline Syntax official docs Refer Here
  
• Lets build a game of life declrative pipeline

pipeline {
    agent { label 'MAVEN_JDK8' }
    stages {
        stage('vcs') {
            steps {
                git url: 'https://github.com/khajadevopsmarch23/game-of-life.git',
                    branch: 'declarative'
            }
        }
        stage('package') {
            steps {
                sh 'mvn package'
            }
        }
        stage('post build') {
            steps {
                archiveArtifacts artifacts: '**/target/gameoflife.war',
                                 onlyIfSuccessful: true
                junit testResults: '**/surefire-reports/TEST-*.xml'
            }
        }
    }
}

• Refer Here
• Build the project and view the results
  
• Exercise: Create a pipeline with 3 stages
  • vcs:
    • run the command git --version
    • should run on agent with label ‘git’
  • build
    • run the command mvn --version
    • should run on agent with label ‘maven’ or ‘maven-jdk8’
  • deploy
    • run the command kubectl --version
    • should run on agent with label ‘k8s’ and ‘developer’
• Solution

pipeline {
    agent none
    stages {
        stage('vcs') {
            agent { label 'GIT' }
            steps { 
                sh 'git --version'
            }
        }
        stage('build') {
            agent { label 'MAVEN || MAVEN_JDK8' }
            steps {
                sh 'mvn --version'
        }
        stage('deploy') {
            agent { label 'k8s && developer' }
            steps {
                sh 'kubectl --version'
            }
        }
    }

}