Deploy Java MySQL app with CI/CD Pipeline

A complete CI/CD project to build and publish an application by Jenkins to the Kubernetes cluster.

Follow aws branch for AWS cloud deployment steps.

Project Description

Initially, configure a Kubernetes cluster with 1 master node, 1 worker node and a Jenkins server with Docker and Kubectl setup by Ansible playbook. Then automate build and publish of a Java application with MySQL database in Kubernetes cluster using CI/CD pipeline.

Architecture diagram

Project Setup

Pre-requisites

Prepare three virtual machines in RHEL 9 equivalent environment. One of them is for the Kubernetes master node, another one is for the worker node and the third is for the Jenkins server.

Prepare Kubernetes cluster using Ansible

Follow this kubernetes-cluster-setup-playbook to setup Kubernetes cluster by running an Ansible playbook.

Prepare Jenkins server

Install Jenkins, Docker, and Kubectl by Ansible

Follow this jenkins-docker-setup-playbook to install Jenkins server, Docker, Kubectl by running an Ansible playbook.

Plugins and tools setup from Jenkins dashboard

Install Plugins:

• Docker
• Docker Pipeline
• Kubernetes
• Kubernetes CLI

Tools setup:

• JDK - Name: Java_11, JAVA_HOME: /usr/lib/jvm/java-11-openjdk
• Git - Name: Git, Path executable: /usr/bin/git
• Maven - Name: Maven_3, MAVEN_HOME: /usr/share/maven
• Docker - Name: Docker_24, Installation root: /usr/bin/

Credentials setup from Jenkins dashboard

• Kind: 'Username with password', ID: docker_credentials, Username: <username>, Password: <docker_access_token>.
• Kind: 'Secret file', ID: kubeconfig, File: select your kubeconfig.txt file.

Configure new pipeline from Jenkins dashboard

• Create New Item > Enter name (kubernetes-deploy) > Select ‘Pipeline’ type.
• Goto ‘Your pipeline’ > Configure > Select Poll SCM > Set schedule H/2 * * * * > Select Pipeline script from SCM > Repository URL > Select your branch to build > Script Path (Jenkinsfile) > Save.
• Goto ‘Your pipeline’ > Build Now.

Deploy new update with CI/CD pipeline

Creating new commit in the repository will trigger a new build with following stages:

• Git Clone
• Build Artifact
• Build Container Image
• Publish Docker Image
• Deploy App in Kubernetes

Browse the application from a browser

• Visit http://worker-node-address from your local browser.
• Use username 'admin' and password 'admin' to login to the dashboard.