Jenkins

  • Agents in Jenkins
    • An agent is a machine or a container that connects to Jenkins controller and execute tasks as directed by the controller.
    • Controller administrate the connections and tooling for the container or agent.
    • Agent can be bare metal, virtual or can be on cloud.
    • Any machine that can run Java can be an agent for Jenkins controller.
    • Agents provide more security and better performance.
  • Create Agent Node in Jenkins.
    • To create an Agent node In Jenkins, go to manage Jenkins and click on nodes.
    • Click on new node.
    • Give it a name, description, and root directory.
    • Add labels based on your usage.
    • Add launch methods and its credentials.
    • Host key verification strategy
      • JDK and port options
    • Number of executors of an agent is based on CPU’s Available on your machine.
    • For non verifying verification strategy as Host Key verification strategy we just need credentials for launching agents via SSH.
    • Using SSH keyfile for launching agents via ssh.
      • We use known hosts file strategy as Host key verification strategy here.
      • Create the following Directory
        • mkdir -p /var/lib/jenkins/.ssh
      • Copy entries for your ssh host in the known_hosts directory
        • ssh-keyscan -H hostname >> /var/lib/jenkins/.ssh/known_hosts
      • Change the ownership of .ssh folder to jenkins user
        • chown -R jenkins /var/lib/jenkins/.ssh
  • Creating pipeline In Jenkins.
    • We create, a pipeline Jenkins to define a series of steps To perform an action Like, pulling the files from git Repository And performing operations using them.
    • To create a pipeline Select new item and then pipeline from the Jenkins dashboard.


    • Provide its definition either in text format or From SCM, like git repository.
    • Change the BRANCH and give path to script file If given from repository.


    • Create credentials in Jenkins for the PostgresDB For example, in the Given repository We are executing scripts from flyway

      • You will use the id of these in pipline
    • Create a database with name, flyway and run the pipeline.

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