Build a Jenkins Pipeline | DevOps CI/CD Training

Jenkins Pipeline (or simply "Pipeline" with a capital "P") is a suite of plugins which supports implementing and integrating continuous delivery pipelines into Jenkins. Jenkins for Continuous Integration and Continuous Deployment which make it easier for developers to integrate changes to the application, and to schedule various jobs that are supposed to run on a nightly batch. 

Jenkins is an open source automation tool written in Java with plugins built for Continuous Integration purpose. Jenkins is used to build and test your software projects continuously making it easier for developers to integrate changes to the project, and making it easier for users to obtain a fresh build.

What is Jenkins?

Jenkins is an open source automation tool written in Java with plugins built for Continuous Integration purpose. Jenkins is used to build and test your software projects continuously making it easier for developers to integrate changes to the project, and making it easier for users to obtain a fresh build. It also allows you to continuously deliver your software by integrating with a large number of testing and deployment technologies.

With Jenkins, organizations can accelerate the software development process through automation. Jenkins integrates development life-cycle processes of all kinds, including build, document, test, package, stage, deploy, static analysis and much more.

Jenkins achieves Continuous Integration with the help of plugins. Plugins allows the integration of Various DevOps stages. If you want to integrate a particular tool, you need to install the plugins for that tool. For example: Git, Maven 2 project, Amazon EC2, HTML publisher etc.

The image below depicts that Jenkins is integrating various DevOps stages:

Edureka Lecture:

What is continuous integration?

Why we need continuous integration?

Continuous integration tools

Before Continuous Integration	After Continuous Integration
The entire source code was built and then tested Developers have to wait for tests results No feedback	Every commit made in the source code is built and tested Developers know the test result of every commit made of every commit made in the source code on the run Feedback is present

Installation: manage Jenkins>>manage plugins>>

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This may also be found at: C:\Users\ramu1\.jenkins\secrets\initialAdminPassword

https://www.youtube.com/watch?v=8ExK0jPq_vM: jenkins installation

1. go to jenkins-ci.org
2. Select long term support release which is a stable build.
3. Click on the link .war
4. Then in Terminal cd to that path where you downloaded
5. Run this command: java -jar jenkins.war

Why we need continuous delivery (CD)?

These problems are solved using CD Pipeline

Pipeline (formerly known as Workflow) was built with the community’s requirements for a flexible, extensible, and script-based CD pipeline capability for Jenkins in mind. To that end, Pipeline:

• Can support complex, real-world, CD Pipeline requirements: pipelines can fork/join, loop, parallel, to name a few
• Is Resilient: pipeline executions can survive master restarts
• Is Pausable: pipelines can pause and wait for human input/approval
• Is Efficient: pipelines can restart from saved checkpoints
• Is Visualized: Pipeline StageView provides status at-a-glance dashboards including trending

mvn verify

mvn compile

mvn clean install

• clean: deletes the /target folder. So, the same result for both commands.
• package: Converts your .java source code into a .jar/.war file and puts it into the /target folder.
• install: First, it does a package(!). Then it takes that .jar/.war file and puts it into your local Maven repository, which lives in ~/.m2/repository.
• Example:
  When you call mvn deploy, mvn will also execute every lifecycle phase before deploy, in order: validate, compile, test, package, verify, install.
  Same for verify: validate, compile, test, package. Same for all other phases.
  And as clean is not part of Maven’s default lifecycle, you end up with commands like mvn clean install or mvn clean package. Install or package will trigger all preceding phases, but you need to specify clean in addition.

Install a Jenkins on your local machine. It defaults run on http://localhost:8080/ 

Jenkins is a self contained, open source automation server which can be used to automate all sorts of tasks such as building , testing, and deploying software. Jenkins is a continuous integration tools.

Pre-requisite - Java, Jenkins war file

Supporting tools: Maven, Nunit, Nuget, Git

Apache Maven is a popular build tool, that takes your project’s Java source code, compiles it, tests it and converts it into an executable Java program: either a .jar or a .war file. 

mvn clean install is the command to do just that.

1. You are calling the mvn executable.  which means you need Maven installed on your machine.

2. You are using the clean command, which will delete all previously compiled Java sources and resources (like .properties) in your project. Your build will start from a clean slate.

3. Install will then compile, test & package your Java project and even install/copy your built .jar/.war file into your local Maven repository

Maven build lifecycle: phases

Lets check our project is compiles well or not.

Open command Prompt. Then go to maven project location . Then type following commands and see result:

mvn

mvn clean

mvn compile (--compile project...once build success..then

mvn verify

mvn clean ins

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Instillation of Jenkins:

are two ways of installing Jenkins on your machine. One you can directly install on your machine and run it. Another download the jenkins file and run from command prompt.

Run Jenkins on Local machine from command prompt: 

To run Jenkin from local machine, go to command prompt: and  type: java -jar jenkins.war (jenkins war file.. jenkins.war)

Another way Go to download Jenkins file  and war file. Then type: cmd . Command prompt opens and  type java -jar (path of war file). Then copy paste password from cmmand promt. Then go to http://localhost:8080/ and put a password which wass on cmnd promt

Note: Install a Jenkins on your local machine. It defaults run on http://localhost:8080/ 

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Installation process click here: JENKINS INSTALLION FROM WINDOWS

........................IMPORTANT........................

1. go to command and type : mvn

2. go to your frmawork pom file and copy path and  type cd  "path of frmaework"and paste: eg: "C:\Users\Manoj Adhikari\Documents\workspace-spring-tool-suite-4-4.4.2.RELEASE\modularFrameWorkSaurabTutorial"

3. type: mvn clean

4.  move demo @anotation file from src/main/java to scr/test/java - then only build success and test runs.

5. mvn test - first compiles and testing 

and write a xml file source which you want to run

for jenkins 

http://localhost:8080/

then login....

Jenkin command

command 1: Execute Windows batch command

c:cd "C:\Users\Manoj Adhikari\eclipse-workspace\ModularFramework8142019"mvn clean

command 2: Execute Windows batch command

c:cd "C:\Users\Manoj Adhikari\eclipse-workspace\ModularFramework8142019"mvn test

........................... or downoad generic java war file..download donload apche otmcat...

.........................how to create on http://localhost:8080/

create new then write name of project and freestyle project. 

How to plugin github to jenkins?

http://localhost:8080/pluginManager/available

go to jenkin

click Manage Jenkins

click plugin Manager

and check on available and click on github integration plugin

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please enter on google what is my client ip and put that ip address on localhost and it works

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Step of integration GitHub or bit bucket to Jenkins

- Go to Jenkins  http://localhost:8080/

- write a project name and select freestyle project

- Provide project location from github url or bitbucket project url or local project path.

- If you are providing from github or bitbucket, then go to to the project, setting, manage webhooks. and make a dynamic setting for your web.

For  Bitbucket project and  go to setting and add webhooks http://47.187.34.61:8080/github-webhook/

-content type : application/jason. 

We can setup our project from Bitbucket server, Git or local and integrate with the Jenkins pipeline for CD. Some examples are below.

Jenkins Project Setup. Blue color - is project is successfully proceed on . Red is project fail.

Jenkins PipeLine Selenium - Script for FreeStyle Project

Jenkins Pipeline script for API Karate-Framework

How to integrate postman collection to Jenkins......

Download postman jason file and install https://nodejs.org/en/ node js on your machine. 

Then go to command prompt: node -v .

Then cmd : npm -v

For Newman install: npm install -g newman

Type : newman run D:\postman\POSTMAN.json

Then before create a freestyle project on  Jenkins and go to command prompt and type:

cd C:\Users\Manoj Adhikari\AppData\Roaming\npm\node_modules\newman\binnode newman

 run D:\postman\PracticePostmanUdemy.json

Postman collection Jenkin integration:

Cucumber Plugin with Jenkins:

Jenkins setup - Pipeline sript.

cd "C:\Dev\modular-framework-texas-practice-saurab"

mvn clean install

How to send email notification form Jenkins

Go to manage Jenkins, > config jenkins