This blog is about 90dayofdevops day 22 of assignment

What is Jenkins?

Jenkins is an open source continuous integration-continuous delivery and deployment (CI/CD) automation software DevOps tool written in the Java programming language. It is used to implement CI/CD workflows, called pipelines.
Jenkins is a tool that is used for automation, and it is an open-source server that allows all the developers to build, test and deploy software. It works or runs on java as it is written in java. By using Jenkins we can make a continuous integration of projects(jobs) or end-to-endpoint automation.
Jenkins achieves Continuous Integration with the help of plugins. Plugins allow 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.

Let us do discuss the necessity of this tool before going ahead to the procedural part for installation:

Nowadays, humans are becoming lazy😴 day by day so even having digital screens and just one click button in front of us then also need some automation.
Here, I’m referring to that part of automation where we need not have to look upon a process(here called a job) for completion and after it doing another job. For that, we have Jenkins with us.

Tasks:

1. What you understood in Jenkin, write a small article in your own words

Answer:

Jenkins is an open source automation tool written in Java programming language that allows continuous integration.

Jenkins builds and tests our software projects which 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 us to continuously deliver our software by integrating with a large number of testing and deployment technologies.

Jenkins offers a straightforward way to set up a continuous integration or continuous delivery environment for almost any combination of languages and source code repositories using pipelines, as well as automating other routine development tasks.

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

2.Create a freestyle pipeline to print "Hello World!!

Step 1: Create an instances

Step 2: Install java in your server

$ sudo apt update
$ sudo apt install openjdk-11-jre
$ java -version
openjdk version "11.0.12" 2021-07-20
OpenJDK Runtime Environment (build 11.0.12+7-post-Debian-2)
OpenJDK 64-Bit Server VM (build 11.0.12+7-post-Debian-2, mixed mode, sharing)

Step 3: Install Jenkins in your server by seeing the official website weekly release

curl -fsSL https://pkg.jenkins.io/debian/jenkins.io-2023.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
sudo apt-get update
sudo apt-get install jenkins

check whether Jenkins is installed or not by typing the command

systemctl status jenkins

Step 4: Open port 8080 in the instances security group because Jenkins runs on port 8080

Step 5: Copy your IP address

Step 6: Paste your IP address in google chrome and add ":8080" to the IP address

Step 7: Now you should see the page like this

Step 8: Now you should unlock Jenkins by adding Administrator password. To get this password run the cammand in your terminal

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Step 9: Copy that password and paste it their and press continue

Step 10: Install suggested plugins

Step 11: Now create your account in Jenkins and press save and finish

Step 12: Now click on start using Jenkins

Step 13: Now you directed to this page and click on create job

Step 14: Now type simple-test or any name you prefer and select freestyle project then click on "OK"

Step 15: Add description and in Build Steps select Execute shell

Step 16: Now you will see this area

Step 17: In this area write this command

echo "Hello World!!!"

Step 18: Now simply click on Build now

Step 19: Now you can see the progress here and click on #1

Step 20: You see this page and click on console output

Step 21: Here you can see our task has been completed

Thanyou for reading this blog and if any query or if any correction to be done in this blog please let me know.

Day-22 : Getting Started with Jenkins 😃

Table of contents

What is Jenkins?

Tasks: