DevOps Classroom Series – 12/May/2020

Jenkins Distributed Builds

• Current Setup which we have looks as shown below

• On this machine we can build two jobs parallely as we have two build executors.

• What has to be done if i have to build 100 projects/jobs?

  • Increase executors which requires lot of System Resources (CPU, RAM, Storage)
  • Jenkins supports Distributed architecture

• Jenkins has two kinds of servers

  • Master:
    • Java is Installed
    • Jenkins is installed
    • Used for administration and job/project creation
  • Node:
    • Java is Installed
    • Agent is configured
      • SSH
      • JNLP
    • These are machines where the build happens
    • Each node has a label

• Architecture

• Advantages:

  • To increase executors add nodes
  • Different kinds of projects can be built (Java, .net, unix)

Adding a jenkins node with SSH Connectivity

Configure with username and password using SSH

• Create a vm with username and password configuration which can be pinged from jenkins master

• Install JAVA, MAVEN and git

• Navigate to Manage Jenkins => Manage Nodes and Clouds

• Now lets navigate to home directory of jenkins server

• Exercise: Examine Jenkins Workspaces on master and nodes for the jobs configured to be executed on Jenkins Nodes.

Jenkins Multi-Master Setup

Jenkins Backup

• Jenkins Backup is all about taking the backup of JENKINS_HOME directory on Jenkins Master.
• This can be done using conventional rsync approaches
• Can be taken from Jenkins Plugins will be covered in next session

Jenkins Plugins

• Jenkins Plugins are used to extend jenkins functionality mostly on the ui front, To experiment
• Lets Install a simple Plugin called as Green Balls Plugin.
• Navigate to Manage Jenkins => Manage Plugins