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01.Intro to Jenkins.md

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01.Intro to Jenkins.md

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Jenkins

  • The most popular automation tool used worldwide for continuous integration and continuous delivery.

  • Jenkins is a free and open-source automation server that enables developers to build, integrate and test code automatically as soon as it is committed to the source repository.

Challenges faced by developers :

When working on a project with different teams, developers often face issues with different teams using different CI tools, version management, and other tools.

Setting up a CI/CD toolchain for each new project will lead to certain challenges like:

  • Slower releases

  • Manual Builds

  • Non repeatable processes

  • No automations

Features of Jenkins

  • Automated Builds

  • Automated tests

  • Automated CI/CD pipelines

  • Automated deployments

  • Ability to install jenkins locally

  • Jenkins support and plugins

Installing Jenkins in a VM and getting started

  • SSH into the server

  • Install the prerequisite - JAVA

    sudo apt install openjdk-11-jdk

  • Add the jenkins repository key to the system

    wget -q -0 - https://pkg.jenkins.io/debian-stable sudo apt-key add -

  • Append the jenkins respository to server source list (add it to package manager)

    sudo sh -c 'echo deb http://pkg.jenkins.io/debain/etc/apt/sources.list.d/jenkins.list'

  • Update all packages so that jenkins is embedded into it

    sudo apt update -y

  • Install jenkins

    sudo apt install jenkins

  • Start jenkins

    sudo systemctl start jenkins

  • To check status of jenkins

    systemctl status jenkins

  • To open up firewall in order to interact with Jenkins from UI (open port 8080)

    sudo ufw allow 8080

  • Add password to the server in order to unlock jenkins from UI - copy paste the result (admin password) in UI.

    sudo cat /var/lib/jenkins/secrets/initailAdminPassword

    Server is now officially up and running

  • Create First Admin User and config

  • You'll be logged into the jenkins portal successfully.

Jenkins CLI

  • Built in CLI that allows users and administrators to access Jenkins from a script or shell environment.

  • convinient for scripting of routine tasks, bulk updates, troubleshooting

  • can be accessed over SSH/ Jenkins CLI client

DOCUMENTATION : jenkins - CLI