(Day 18) Task : Jenkins and CI/CD Pipeline Project Part 1 with Setup Environment :-

Welcome back to Day 18 of my #90DaysOfDevOps journey! Today, we are taking our first step into setting up a complete CI/CD pipeline using Jenkins. In this post, we’ll focus on preparing our local Mac environment by installing and configuring the key tools required: Java, Maven, Git, and Jenkins.

Why CI/CD and Jenkins?

CI/CD (Continuous Integration and Continuous Deployment) is the backbone of modern DevOps practices. Jenkins is one of the most widely used automation tools to implement CI/CD pipelines, making it an essential part of any DevOps toolkit.

Objectives of Part 1:

1. Install and verify Java (required for Jenkins and Maven).

2. Install Apache Maven for building Java applications.

3. Install Git for version control.

4. Install and set up Jenkins as a service.

5. Verify the entire environment is correctly configured.

Platform: macOS

We’re using macOS for this setup. Most of these tools are easily installed using Homebrew, a popular package manager for macOS.

Step 1 : Install Git

Git is essential for version control and integration with repositories like GitHub or GitLab.

Commands:

brew install git "Or" Download & Install git bash for mac

Verify & Config Git:

# verify:
        git --version
# Config:
        git config --global user.name "Aditya Sharma"
        git config --global user.email "adityabrahman.1990@gmail.com"
# Listing:
        git config --global --list

Step 2 : Install Java (OpenJDK)

Jenkins and Maven both require Java to run. Let’s install the latest version of OpenJDK 17.

Commands:

brew install openjdk@17 "Or" download latest armg64 dmg insaller for mac from oracle java

Configure Java:

After installation, link it properly:

# To find Path of file :
                        /usr/libexec/java_home -V 
# Export path of JAVA_HOME in our bash(old devices filename)/Zsh(new devices filename)rcfile
# Open .zshrc file using "open .zshrc" & paste it inside the file :
export JAVA_HOME=$(/usr/libexec/java_home -v <version>) 
export PATH=$JAVA_HOME/bin:$PATH

# To Load file into terminal:
source.zshrc

Verify & check java set or not :

# Verify:
        java -version
# check java set or not:
        echo $JAVA_HOME        --> Gives Location of JAVA_HOME

Step 3 : Install Apache Maven

Maven is a build automation tool primarily used for Java projects.

Commands:

install maven

Configure Java:

After installation, link it properly:

# To find Path of file :
                        /usr/libexec/maven_home -V 

# Open .zshrc file using "open .zshrc" & paste given below paths inside the file :
export MAVEN_HOME=$HOME/apache-maven-3.9.9
export PATH=$MAVEN_HOME/bin:$PATH

Verify Maven:

mvn -version

Step 4: Install Jenkins

Now that Java is ready, let’s install Jenkins.

Commands:

brew install jenkins-lts

Start Jenkins:

brew services start jenkins-lts

This will start Jenkins as a background service.

Check Jenkins Status:

brew services list

Access Jenkins:

Open your browser and go to:

localhost:8080

You’ll see the initial Jenkins setup page.

Final Setup in UI :

1. Install suggested plugins (recommended).

2. Create your admin user.

3. Configure Jenkins instance URL (use http://localhost:8080).

4. Jenkins is ready to use!

What’s Next?

In Part 2, we’ll:

• Connect Jenkins to GitHub.

• Create a Maven-based Java project.

• Build and test it using a Jenkins job.

• Understand how to define a CI pipeline using a Jenkins file.