CI-CD with Jenkins

This is the playground for setting up CI-CD pipeline with Jenkins and deploy on Pivotal Web Services

We are leveraging ngrok - secure introspectable tunnels to localhost to publish webhook events running on local jenkins.

Important Pieces for this Pipe-line

1. Jenkins File
2. Manifest File

Jenkinsfile

pipeline {
    agent any

    stages {
        stage('Build') {
            steps {
                withMaven(maven: 'my_maven_3.6.1') {
                    sh 'mvn clean package'
                }
            }
        }

        stage('Deploy') {
            steps {
                withCredentials([[$class          : 'UsernamePasswordMultiBinding',
                                  credentialsId   : 'PIVOTAL_CLOUD_FOUNDRY',
                                  usernameVariable: 'USERNAME',
                                  passwordVariable: 'PASSWORD']]) {

                    sh '/usr/local/bin/cf login -a http://api.run.pivotal.io -u $USERNAME -p $PASSWORD'
                    sh '/usr/local/bin/cf push'
                }
            }
        }
    }
}

Manifest File (To do the deployment in Pivotal WebServices using cloud foundry cli)

---
applications:
- name: ci-cd-with-jenkins
  instances: 1
  memory: 800m
  path: target/ci-cd-with-jenkins-0.0.1-SNAPSHOT.jar

Plugin used inside Jenkins

1. Pipeline Maven Plugin
2. Embeddable Build Status Plugin

BLUE GREEN Deployment on Cloud Foundry

• In order to do blue-green deployment, create 2 artifacts one with ci-cd-blue and another ci-cd-green

Following Steps will deploy Blue/Green war file to Cloud Foundry

1) Login to Cloud Foundry ==> cf login
2) Check which apps are running ==> cf apps
3) Deploy app in cloud foundry ==> cf push -f manifest-blue.yml/manifest-green.yml

Let's map a generic route https://ci-cd-production.cfapps.io/version to these blue and green

 cf map-route ci-cd-green cfapps.io --hostname ci-cd-production
 cf map-route ci-cd-blue cfapps.io --hostname ci-cd-production

• Now both blue and green instance are being pointed out by ci-cd-production and since Cloud Foundry GO Router implements Software Load balancer and uses RoundRobin out of the box to distribute load. So we see output from blue and green interchangeably

Now since our Green features are good to go in production for all set of users, let's just remove blue mapping altogether from ci-cd-production route.

cf unmap-route ci-cd-blue cfapps.io --hostname ci-cd-production

Now production only points to green instance, We have successfully deployed new App version with No downtime required, using Blue-Green Deployment strategy.