Jenkinsfile-CD

// JENKINS CD PIPELINE
// Here the image stored in Dockerhub will be deployed using K8s
// IMP NOTE: Store your EC2 instance username & key in Jenkins credentials

pipeline {
    agent any
    // DECLARE THE VARIABLES HERE:
    environment {
    NODE_IP = '<Node_Server_Private_IP>'   // paste your Node-Server private IP here
    EC2_NAME = "ec2-user"                  // enter your AWS EC2 username
    PIPELINE_NAME = "CI-PIPELINE"          // enter your pipeline name here 
    PROJECT_NAME = "DevopsProject1"        // enter your Devops project name here
    }

    stages {
        stage("1. Pull Files") {
            // Copy K8s manifest files from Master-Server workspace to Node-server
            steps {
              sshagent(['my_ec2_creds']) {         // install 'ssh agent' plugin & generate 'ssh-agent' pipeline syntax generator 
                sh "ssh -o StrictHostKeyChecking=no ${EC2_NAME}@${NODE_IP}"   // enter your Node Server's private IP here
                sh "scp /var/lib/jenkins/workspace/${PIPELINE_NAME}/${PROJECT_NAME}/deployment.yaml ${EC2_NAME}@${NODE_IP}:/home/ec2-user/"
                sh "scp /var/lib/jenkins/workspace/${PIPELINE_NAME}/${PROJECT_NAME}/service.yaml ${EC2_NAME}@${NODE_IP}:/home/ec2-user/"
              }
            }
        }

        stage('2. Approval') {
          // If 'manual approval' is required, then it is called 'Continuous Delivery'
          // If it is totally automated, then it is called 'Continuous Deployment'
            steps {
                input message: 'Approve deployment?'
            }
        }

        stage("3. Deployment") {
          // K8s Deployment using Ansible
            // i. Ensure to establish passwordless connection between Master & Node first
           // ii. Your deployment.yaml file must contain the Dockerhub image within the container block
            steps {
              sshagent(['my_ec2_creds']) {          // store EC2 username & pem-key in Jenkins credentials
                sh "ssh -o StrictHostKeyChecking=no ${EC2_NAME}@${NODE_IP}"   // enter your Node-Server private IP here
                sh "ssh -o StrictHostKeyChecking=no ${EC2_NAME}@${NODE_IP} kubectl apply -f deployment.yaml"
                sh "ssh -o StrictHostKeyChecking=no ${EC2_NAME}@${NODE_IP} kubectl apply -f service.yaml"
                sh "ssh -o StrictHostKeyChecking=no ${EC2_NAME}@${NODE_IP} kubectl rollout restart deploy"
                sh "ssh -o StrictHostKeyChecking=no ${EC2_NAME}@${NODE_IP} kubectl get service"
              }
            }
        }
    }
}