100-Days-Of-DevOps-Challenge-KodeKloud

Set Up Jenkins Server

The DevOps team at xFusionCorp Industries is initiating the setup of CI/CD pipelines and has decided to utilize Jenkins as their server. Execute the task according to the provided requirements:

1. Install Jenkins on the jenkins server using the yum utility only, and start its service.
   • If you face a timeout issue while starting the Jenkins service, refer to this.
2. Jenkin’s admin user name should be theadmin, password should be Adm!n321, full name should be John and email should be john@jenkins.stratos.xfusioncorp.com.

Note:

1. To access the jenkins server, connect from the jump host using the root user with the password S3curePass.

2. After Jenkins server installation, click the Jenkins button on the top bar to access the Jenkins UI and follow on-screen instructions to create an admin user.

Steps

1. Login into jenkins server and find operating system

    ssh root@jenkins
   

     cat /etc/os-release 
    NAME="CentOS Stream"
    VERSION="9"
    ID="centos"
    ID_LIKE="rhel fedora"
    VERSION_ID="9"
    PLATFORM_ID="platform:el9"
    PRETTY_NAME="CentOS Stream 9"
    ANSI_COLOR="0;31"
    LOGO="fedora-logo-icon"
    CPE_NAME="cpe:/o:centos:centos:9"
    HOME_URL="https://centos.org/"
    BUG_REPORT_URL="https://issues.redhat.com/"
    REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux 9"
    REDHAT_SUPPORT_PRODUCT_VERSION="CentOS Stream"
   

   We can see its’ centos 9 os based server

2. Run the following command to update packages:

    yum update -y
    yum install -y wget
   

3. We will install jenkins for fedora with stable version, following this [Documentation]

    sudo wget -O /etc/yum.repos.d/jenkins.repo \
    https://pkg.jenkins.io/redhat-stable/jenkins.repo
    sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key
    sudo dnf upgrade -y
    # Add required dependencies for the jenkins package
    sudo dnf install fontconfig java-21-openjdk -y
    sudo dnf install jenkins -y
    sudo systemctl daemon-reload
   

4. Start Jenkins server

    sudo systemctl enable --now jenkins
   

5. Copy the password:

    cat /var/lib/jenkins/secrets/initialAdminPassword
   

6. Login into Jenkins UI and Setup Jenkins

   • Paste the initial password
   • Install suggested plugins (it will take some time)
   • Continue (skil retry)
   • set: username, password, confirm password, full name and email
   • Save and Continue > Save and Finish
   • Start Jenkins
   • Done

Good to Know?

Jenkins Fundamentals

• CI/CD: Continuous Integration and Continuous Deployment
• Automation: Automate build, test, and deployment processes
• Pipeline: Series of automated steps for software delivery
• Plugins: Extend functionality with thousands of plugins

Jenkins Architecture

• Master Node: Coordinates builds and manages configuration
• Agent Nodes: Execute build jobs (slaves)
• Jobs: Individual tasks or projects
• Builds: Execution instances of jobs

Key Features

• Pipeline as Code: Define pipelines in Jenkinsfile
• Distributed Builds: Scale across multiple machines
• Plugin Ecosystem: Integrate with various tools
• Web Interface: User-friendly management console

Installation Components

• Java Runtime: Required for Jenkins execution
• Web Server: Built-in Jetty server
• User Management: Authentication and authorization
• Initial Setup: Security configuration and plugin installation

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