Demo Jenkins Pipeline Checking Versions

In this guide, you’ll create a Jenkins Pipeline named checking-versions to verify that Jenkins can execute Git, Maven, Docker, and Kubernetes commands. This helps catch any environment issues before running your CI/CD workflows.

Prerequisites
Create the Pipeline
Inspect the Build Results
Configure Kubernetes CLI Plugin
Add the Kubeconfig Credential
Update Pipeline with Kubeconfig
Verify Success
References & Links

Prerequisites

Jenkins (v2.x or later) with Pipeline plugin
Agents that have Git, Maven, Docker, and kubectl installed
Admin access to Jenkins for managing credentials

Create the Pipeline

In Jenkins, click New Item.
Enter checking-versions as the name.
Select Pipeline and click OK.

The image shows a Jenkins interface where a user is creating a new item named "checking-version." Various project options like Freestyle project, Pipeline, and Multibranch Pipeline are listed.

Scroll to the Pipeline section and replace the script with:

pipeline {
    agent any
    stages {
        stage('Git Version') {
            steps {
                sh 'git --version'
            }
        }
        stage('Maven Version') {
            steps {
                sh 'mvn -v'
            }
        }
        stage('Docker Version') {
            steps {
                sh 'docker -v'
            }
        }
        stage('Kubernetes Version') {
            steps {
                sh 'kubectl version --short'
            }
        }
    }
}

Save and click Build Now.

Inspect the Build Results

Once the job runs, the Pipeline view will display four stages. The first three should pass, but the Kubernetes stage may fail due to missing cluster credentials:

The image shows a Jenkins dashboard displaying a pipeline named "checking-versions" with a stage view of different version checks, including Git, Maven, Docker, and Kubernetes. The sidebar includes options like "Build Now" and "Configure," and there's a build history section at the bottom.

Open the console output:

[Pipeline] stage
[Pipeline] { (Git Version)
[Pipeline] sh
+ git --version
git version 2.17.1
[Pipeline] }
...
[Pipeline] stage
[Pipeline] { (Kubernetes Version)
+ kubectl version --short
Client Version: v1.21.0
Error from server (Forbidden): <html>…authentication required…

Note

The Kubernetes CLI ran locally but failed to authenticate with the API server.

Configure Kubernetes CLI Plugin

To inject a kubeconfig into your build, install and use the Kubernetes CLI Plugin.

The image shows a webpage from the Jenkins documentation, specifically about the Kubernetes CLI Jenkins plugin, detailing supported credentials and usage parameters. There is also a browser window with multiple tabs open at the top.

Scripted Pipeline example:

node {
  stage('List Pods') {
    withKubeConfig([credentialsId: 'user1', serverUrl: 'https://api.k8s.my-company.com']) {
      sh 'kubectl get pods'
    }
  }
}

Add the Kubeconfig Credential

Go to Manage Jenkins → Manage Credentials.
Under Global, click Add Credentials.
For Kind, select Secret file and upload your local kubeconfig.
Set ID to kubeconfig, add a description, then OK.

The image shows a Jenkins interface for adding new credentials, with options to choose a secret file, set the scope, and provide an ID and description. A person is visible in a small video call window at the top right corner.

Confirm the credential appears in the list:

The image shows a Jenkins interface displaying global credentials, specifically a kubeconfig file listed as a secret file. The browser tabs and address bar are visible at the top.

Update Pipeline with Kubeconfig

Edit the checking-versions Pipeline script. Wrap the Kubernetes stage with withKubeConfig:

pipeline {
    agent any
    stages {
        stage('Git Version') {
            steps { sh 'git --version' }
        }
        stage('Maven Version') {
            steps { sh 'mvn -v' }
        }
        stage('Docker Version') {
            steps { sh 'docker -v' }
        }
        stage('Kubernetes Version') {
            steps {
                withKubeConfig([credentialsId: 'kubeconfig']) {
                    sh 'kubectl version --short'
                }
            }
        }
    }
}

Save and Build Now again.

Verify Success

Now all four stages—including both Kubernetes client and server checks—should pass:

+ kubectl version --short
Client Version: v1.21.0
Server Version: v1.21.0

Warning

For production, avoid using a cluster-admin kubeconfig. Instead, create a ServiceAccount with minimal RBAC permissions for Jenkins.

Demo Jenkins Pipeline Checking Versions

Table of Contents