Jenkins

Example

Jenkinsfile to pull from git, build and deploy to kubernetes

pipeline {
    agent any   
    stages {
        stage('Git') {
            steps {
                git branch: 'main', url: 'https://git-repo-url'
            }
        }

        stage('Build image') {
            steps {
                script {
                    docker.build('my-app', './app')
                    //sh 'docker build -t helloworld .'
                }
            }
        }

        stage('Test') {
            steps {
                script {
                    docker.image('my-app').inside {
                        sh 'npm install'
                        sh 'npm test'
                    }
                }
            }
        }

        stage('Push') {
            steps {
                sh 'docker push my-app'
            }
        }

        stage('Deploy') {
            steps {
                // Update kubernetes manifest
                // Kubernetes credential
                sh 'kubectl apply -f helloworld.yaml'
            }
        }
    }
}

Key Component of Jenkinsfile

• pipeline: Define the pipeline itself
• agent: Where the pipeline run
• stage: Different phase of pipeline, like build, test, deploy
• step: Task to be perform in each stage

Why use Jenkinsfile

• Pipeline as code
• Consistency and version control
• Automation
• Reusability