Jenkins learnings

Build Orchestration Tool - Jenkins

Jay Kasundra's photo
Jay Kasundra
·

3 min read

  • Jenkins is a open source build orchestration tool.

  • Used to automate application builds and deployments

Other similar tools

  • gitlab-ci

  • bamboo

  • Azure Pipelines

  • AWS Code Pipeline

Jenkins Architecture

  • Jenkins is based on Master-Slave architecture.

    • Jenkins_Master Node(VM)

      • Install jdk,jenkins,git.

      • Used to Create the CI/CD Pipeline Projects and schedule to run in slave nodes.

    • Jenkins_Slave Node(VM)

      • To Execute the Application Build.

      • Perform Application Build - Compile, Unit Test, Create Artifacts

      • Build is a process of Compiling the Source Code and Creating Artifacts(Binaries/Executables - .exec/.dll/.jar/.war)

  • Scenario 1 : When projects are created using Java.

    • Jenkins_Master Node(VM)

      • Install jdk,jenkins,git. Install Build Tools like maven

    • No need of slave node

  • Scenario 2 : When projects are created using multiple programming languages like Java, Dotnet, python etc

    • Jenkins_Master Node(VM)

      • Create the CI/CD Pipeline Projects and schedule to run in slave nodes.

    • Jenkins_Slave Nodes(VM)

      • Jenkins_Slave_Node1(VM) - Java Application Build maven

      • Jenkins_Slave_Node2(VM) - Python Application Build

      • Jenkins_Slave_Node3(VM) - .Net Application Build

  • CI/CD Workflow

    • SCM_Checkout

    • Application Build

    • Unit Testing

    • Create Artifacts

    • Promote the Application to Test Environments

    • Notify

    • Deploy to Prod

Working with Jenkins

  • Developers Perspective :

    • Developers are just the consumer of Jenkins project

    • Developers can execute/cancel/read the Jenkins job output

  • DevOps Perspective :

    • DevOps team are the administrator of the Jenkins.

Roles & Responsibilies of DevOps Team :

  • Jenkins Administration

    • Installation of Jenkins

    • Plugins Management

    • Global System Configurations

    • Tools Management

    • User Management

    • Security Management

    • Credential Management

    • Master/Slave Node Configurations

    • Creation CICD Pipeline Projects

    • Onboard Applications to use Jenkins CICD Projects

    • Periodic Upgrade of Jenkins and its plugins

    • Periodic Backup

    • Troubleshooting the Issues!

Installation of Jenkins

  • Install & Configure Jenkins Server :

  1. Install the pre-requisites :

    • Install Jdk:

    • sudo -i

    • sudo apt update -y

    • sudo apt install git -y # To install git if required

    • sudo apt install openjdk-17-jre -y # previous version java -version

  2. Install the Actual tool :

    • Install Jenkins:

    •   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 -y

  3. Perform Post_Installation Activities :::

    • jenkins --version

    • systemctl status jenkins

    • systemctl stop jenkins

    • systemctl start jenkins

    • systemctl restart jenkins

    • systemctl enable jenkins

  • /var/lib/jenkins - Default Installation Dir of Jenkin on Linux Box

  1. Open web browser :

    • http://<Public_IP_Address>:8080/

  2. cat /var/lib/jenkins/secrets/initialAdminPassword - to get password

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