Introduction to Jenkins: What You Need to Know

Hey there! 🎉 Ready to dive into Jenkins? Whether you're new to CI/CD or just need a refresher, this guide will help you get started with Jenkins. Let's go! 🚀

Introduction to Jenkins 🚀

• What is Jenkins? 🤔

  • Jenkins is an open-source automation server.

  • It helps automate the parts of software development related to building, testing, and deploying, facilitating continuous integration and continuous delivery (CI/CD).

  • Jenkins is an open-source automation for CI-CD

  • Jenkins tools developed using java

  • Jenkins is part of Hudson Project

Initially it is called as Hudson then later it renamed to Jenkins

🎬About CI CD

• CI and CD are two most frequently used terms in modern development practices and DevOps practices

• CI stands for continuous Integration. It is fundamental DevOps best practices where developers frequently merge code changes to central repository where automated builds and tests runs.

• CD means Continuous Delivery or Continuous Deployment.

Jenkins is a self-contained, open-source automation server which can be used to automate all sorts of tasks related to building, testing, and deploying software.

🌐🔍Build and deployment Process

1. Take latest source code from Repository

2. Compile source code

3. Execute Unit tests (Junit)

4. Perform code Review

5. Package code as a war file

6. Deploy the war file into server

Note : All the above builds and deployment tasks can be automated using Jenkins tool.

Key Features of Jenkins 🔑

• Extensible: Supports a wide range of plugins for integration with various tools and services.

• Distributed Builds: Can distribute builds and tests across multiple machines for faster execution.

• User-Friendly: Provides a simple and intuitive web-based interface.

• Scalable: Easily scales up for large projects and teams.

Community Support: Boasts a large and active community, providing a wealth of plugins, tutorials, and help.

Why Use Jenkins? 🛠️

• Automation: Reduces manual efforts by automating repetitive tasks.

• Consistency: Ensures consistent build and deployment processes.

• Speed: Accelerates development and deployment cycles.

• Quality: Enhances code quality by running automated tests.

• Integration: Seamlessly integrates with other tools and services.

Prerequisite (Step 1 )

• Jenkins installation on AWS EC2

• Create an EC2 instance with ubuntu Linux AMI

• Connect to your EC2 instance

• Update all packages by following command :

$sudo apt update -y

• Install java by following command :

sudo apt install openjdk-17-jdk -y
#choose version and install version accoding to official document which support jenkins

Step 2

Jenkins installation on AWS EC2 Using apt

Add Jenkins to your apt Repository using following command

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

Import a key file from Jenkins -CI to enable installation from the package

sudo wget -O /usr/share/keyrings/jenkins-keyring.asc \
  https://pkg.jenkins.io/debian/jenkins.io-2023.key
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

Start and Enable Jenkins Service

$sudo systemctl start Jenkins 
$sudo systemctl enable jenkins 
$sudo systemctl status jenkins

Get the initial administration password

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

step 3

Open your EC2 instance public IP (https://<public_IP>:8080/) along with port 8080 in your favorite browser. And provide the administration password obtained during the installation.

Note: Make sure you enable 8080 port in Security Group Inbound Rules.

Provided password which we have copied to unlock Jenkins.

Select "Install Suggested Plugins" Card (It will install those plugins )

🛤️ Creating Your First Job

1. New Item:

   • Click on New Item in the Jenkins dashboard.

2. Name Your Job:

   • Enter a name for your job and select Freestyle project.

3. Configure Your Job:

   • Source Code Management: Link your job to a version control system like Git.

   • Build Triggers: Set when the job should run (e.g., after a commit).Give Build Tigger Periodically

     * * * * *

   • Build: Define the build steps, such as compiling code or running tests.

4. Save and Build:

   • Save your job and click Build Now to run it.

Note: 5 * stars represents every minute Jenkins Job Should Execute

Configure Below Script as a Build Script

echo "Hello Guys, Divya Here" 
touch divya.txt
echo "Hello Guys, Welcome to learnwithdivya.online" >> divya.txt
echo "Done ..!!"

🚀 Tips and Best Practices

• Backup Regularly: Ensure you have backups of your Jenkins configuration and jobs.

• Use Pipelines: Pipelines provide a powerful way to define your build process as code.

• Keep Jenkins Updated: Regular updates bring new features and security improvements.

🎉 Conclusion

Jenkins is a powerful tool that can supercharge your development workflow. By automating builds, tests, and deployments, it frees up your time and helps you focus on what really matters – writing awesome code! 🧑‍💻💪

Happy building with Jenkins! 🚀✨

Here my POC Results for you :

CLI output Jenkins Started

Creation 1st job

Console Output

Build got succuss