===============
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


=> To overcome above challenges we need to automate project build and deployment process.

==================
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('git clone'){
			steps {
				// logic
			}
		}
		stage('mvn build'){
			steps {
				// logic
			}
		}
		stage('build image'){
			steps {
				// logic
			}
		}
	}
}

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

## Source Code Repo :: https://github.com/ashokitschool/maven-web-app

=> Create CI CD pipeline using jenkins with below stages

		Stage-1 : Git Clone

		Stage-2 : Maven Build

		Stage-3 : Build Docker Image

		Stage-4 : Deployment



================ 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('Mvn Build'){
            steps{
                sh 'mvn clean package'
            }
        }
        stage('Build Image'){
            steps{
                sh 'docker build -t ashokit/webapp .'
            }
        }        
        stage('Deployment'){
            steps{
                sh 'docker run -d -p 9090:8080 --name ashokit ashokit/webapp'
            }
        }
    }
}



====================
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.

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