Jenkins CLI to Create and Build job

This project demonstrate how to create and build a Jenkins Jobs using Jenkins CLI. The project has two sample files: a sample Jinja template for jenkins job creation and a sample yaml file for values to be used in creation of jenkins job.

#jenkins #jenkinscli #jenkinsjob #pipelinejob

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Jenkins CLI (In Action)

Table of Contents

• Jenkins CLI to Create and Build job
  • Jenkins CLI (In Action)
  • Table of Contents
  • Using Jenkins CLI for the First Time
    • Requirements
    • Downloading and Configuring
      • Using the CLI over SSH
      • Using the CLI client
  • Usage
  • Example (pipeline.yaml)
  • Example (Jenkinsfile)

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Using Jenkins CLI for the First Time

Requirements

✔ JAVA (OpenJDK 8 or above)

✔ Jenkins (Version 2.204.0 or newer)

✔ Python (Version 3.0 or later)

✔ Pip (pip2 or pip3)

✔ Jinja2 (Latest version) ```snap install j2```

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Downloading and Configuring

The command line interface can be accessed over SSH or with the Jenkins CLI client, a .jar file distributed with Jenkins.

Using the CLI over SSH

• SSH service is disabled by default for new Jenkins installation.
• Go to Manage Jenkins → Configure Global Security. Under SSH Server, set the SSHD Port to Fixed (say 53801) or Random.

• User used for authentication with Jenkins master must have Overall/Read permission in order to access CLI.
• Add SSH public key for the user (which will be used to run Jenkins CLI commands) by navigating to Manage Jenkins → Manage Users → User Settings.

• Execute CLI help command, to check ssh service for CLI:

ssh -l <user> -p <ssh-port> <hostname or ipaddress> help

Example: ssh -l ubuntu -p 53801 localhost help

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Using the CLI client

• Dowload the CLI client jar from jenkins master using url JENKINS_URL/jnlpJars/jenkins-cli.jar
• General syntax for using the CLI client:

java -jar jenkins-cli.jar [-s JENKINS_URL] [global options...] command [command options...] [arguments...]

• There are three basic mode for client connection: -http, -websocket and -ssh
• SSH connection mode syntax:

java -jar jenkins-cli.jar [-s JENKINS_URL] -ssh -user kohsuke command ...

Example: java -jar jenkins-cli.jar -s http://13.xxx.xxx.xxx:8080/ -ssh -user ubuntu help

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Usage

Step 1: Fork or Clone the repository https://github.com/souravatta/Jenkins-CLI.git

Step 2: Download the Jenkins CLI jar inside the cloned repository.

Step 3: Modify the values of pipeline.yaml

Step 4: Run the below command to create a jenkins job using Jenkins CLI.

j2 -f yaml pipeline.j2 pipeline.yaml | java -jar jenkins-cli.jar -s http://13.xxx.xxx.xxx:8080/ -ssh -user ubuntu create-job test6

Step 5: Run the below command to build the jenkins job using Jenkins CLI.

j2 -f yaml pipeline.j2 pipeline.yaml | java -jar jenkins-cli.jar -s http://13.233.173.108:8080/ -ssh -user ubuntu build test6 -f -v

Note: Plugins may also provide CLI commands; in order to determine the full list of commands available in a given Jenkins environment, execute the CLI help command:

ssh -l ubuntu -p 53801 localhost help

OR

java -jar jenkins-cli.jar -s http://13.xxx.xxx.xxx:8080/ -ssh -user ubuntu help

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Example (pipeline.yaml)

pipeline_strategy:
build:
  allow_concurrent: false
  properties:
    days_to_keep: -1
    num_to_keep: 5
  parameters:
    - name: GREET_NAME
      value: Sourav
      description: Name of the person to greet
pipeline:
  git_url: https://github.com/souravatta/Install-Configure.git
  creds_id: github
  branch: master
  script_path: Jenkinsfile

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Example (Jenkinsfile)

pipeline {
    agent any
    stages {
        stage ('Greeting'){
            steps {
                echo "Hello ${env.GREET_NAME}"
            }
        }
    }
}