===============
Jenkins CI CD
===============

1) Build & Deployment process

2) Challenges with Manual build & deployment

3) Jenkins Introduction

4) Jenkins Setup

5) Jenkins CI CD Pipeline

6) Git + Maven + Docker + Jenkins


=============================
What is Build & Deployment
=============================

1) Take latest source code from git hub repo

2) Compile Source Code

3) Execute Unit Test cases

4) Package our application (jar/war)

5) Build Docker image

6) Create Docker container

========================================
Challenges in Manual build & deployment
========================================

1) Every day we need to deploy latest code 

2) Deploy code in multiple environments

		Ex: DEV, SIT, UAT and PROD

3) Takes lot of time

4) Repeated Work

5) Error Prone

==================
What is Jenkins ?
==================

1) Jenkins is free & open source software

2) Jenkins developed using Java language

3) Jenkins is used to automate Build & Deployment process

4) Using Jenkins we can implement CI CD


=> CI CD means continuous integration and continous deployment.

===============
Jenkins Setup
===============

https://github.com/ashokitschool/DevOps-Documents/blob/main/04-Jenkins-Docker-Project.md

======================
Jenkins Pipeline
======================

=> Jenkins pipeline contains set of steps to automate project build and deployment process.

=> We can create jenkins pipeline in 2 ways

		1) Declarative pipeline

		2) Scripted Pipeline (groovy)

=====================================
Jenkins Declarative Pipeline Syntax
=====================================		

pipeline {
	
	agent any 

	stages {
		stage('Hello'){
			steps{
				// logic
			}
		}
	}
}


============================================
Git + Maven + Docker + Jenkins Integration
============================================

## Git Hub Repo :: https://github.com/ashokitschool/maven-web-app


1) Configure maven as global tool in jenkins

		Global Tool Name : Maven-3.9.9

2) install docker in jenkins vm

3) Create CI CD pipeline in jenkins

		Stage-1 : Git Clone

		Stage-2 : Maven Build

		Stage-3 : Build Docker Image

		Stage-4 : Deployment

4) Execute CI CD pipeline & observe console output

5) Enable host port in ec2 vm security group inbound rules

6) Access our application in browser

		URL : http://public-ip:host-port/maven-web-app/


================ Final CI CD Pipleline ===========================

pipeline {
    agent any
    
    tools{
        maven "Maven-3.9.9"
    }

    stages {
        stage('Git Clone') {
            steps {
                git 'https://github.com/ashokitschool/maven-web-app.git'
            }
        }
        
        stage('Maven Build'){
            steps{
                sh 'mvn clean package'
            }
        }
        
        stage('Build Docker Image'){
            steps{
                sh 'docker build -t ashokitapp .'
            }
        }
        
        stage('Deployment'){
            steps{
                sh 'docker run -d -p 9090:8080 --name ashokitapp ashokitapp'
            }
        }
    }
}




====================
Real-Time workflow
====================

=> DevOps team will setup Jenkins server in linux vm

=> DevOps team will manage  users in jenkins server 
		(role based access)

=> For Development team members, only jobs read & execute access will be available.

=> Development team will send request to DevOps team to create jenkins pipeline for the project.

=> Based on Dev Team request, DevOps team will create CI CD pipeline for the project.

=> Dev Team  members can run CI CD pipeline for project build & deployment process.

Note: If CI CD job execution got failed then we need to check job execution logs (console output).