DevOps Classroom Series 13/Feb/2021

Maven contd..

• Maven Parent POM (Super POM) is used to structure the project to avoid duplicate configurations
• When developing a complex project we might create multiple sub projects
  • In the parent pom we would be mentioning the packaging type as pom
  • In the child pom you would specify the parent structure
  • Now to build this project all the childs will be built
• Now lets integrate maven to run on jenkins server
• The job fails as maven is not installed on this machine
• Now install maven on the server where jenkins is installed

sudo apt install maven -y

Jenkins Free Style Project

• Free Style is a legacy jenkins project type.
• This project has six sections
  • General:
    • This section has basic description about project
  • Source Code Management:
    • This section defines the source code management or version control of the project code
    • By default jenkins will have git plugin installed, so we will see two options none and Git.
    • If you require other VCS systems
      • install vcs on the node
      • install vcs plugin on jenkins ui
  • Build Triggers:
    • Basically focused on when to build a project
  • Build Environment
  • Build
  • Post Build Actions
• Lets try to create a jenkins free style project to build spring petclinic
  • every time developer submits the code to git
  • Show the test results
  • Give an option to download the package
• Solution:
  • Try to fork spring petclinic from Refer Here to your account
  • Create a free style project with any name
  • Now specify the git source code details
  • Now lets go to the build section and use invoke top level maven targets
  • Now lets navigate to the build triggers section and use poll scm
  • Now lets save the project and create a dummy push in the github repo
  • Now the build will be triggered
  • Now lets configure this project to show the unit test results. Navigate to Post build actions => Publish Junit test results
  • Now build the project and observe the project page after build is finished
  • Now lets give an option to show the projects primary artifact (project packaging format). Navigate to Post Build actions => Archive the artifacts
  • Now save and build the project

Configuring Jenkins

• In this section we will learn some basic jenkins administration tasks
  • Jenkins Plugin Management
  • User Management in Jenkins
  • Performing backup/restore in Jenkins

Jenkins Plugin Manager

• Jenkins plugins are pieces of software that upon installation will enhance the jenkins functionality
• To view the Jenkins Plugins
• To install the plugin navigate to available section and search for plugins and install them
• Manually Installing a Jenkins Plugin
  • Jenkins plugin will be in the format of .hpi (hudson plugin interface) or .jpi(jenkins plugin interface)
• Plugin might require jenkins restart to work. Jenkins Plugin adds the functionality.
• Plugins might add functionality in the
  • Jenkins Job Configurations
  • Jenkins Management Configurations

Jenkins Backup and Restore

• In Jenkins all the configuration is stored in Jenkins Home directory.
• If we want to backup jenkins just take the backup of Jenkins home directory
• We can apply various approaches for taking the backup of jenkins home directory (/var/lib/jenkins)
  • write a cron job to take the backup of jenkins periodically
  • Use rsync
  • Use Jenkins Periodic Backup Plugin
• Install Jenkins periodic backup plugin
• Navigate to Manage Jenkins => Periodic Backup Manager
• Now configure the settings and create backup
• Once backups are available, we can restore from backups