GitLab CI comparison in Jenkins - Commands & Configuration

Introduction

When teams want to automate software building, testing, and deployment, they use tools called CI/CD systems. GitLab CI and Jenkins are two popular tools that help run these automated steps. Comparing them helps you pick the right tool for your project.

When you want a CI/CD tool tightly integrated with your Git repository and issue tracking.

When you need a highly customizable automation server that supports many plugins.

When you want to run simple pipelines without managing your own servers.

When you want to use a tool that supports many programming languages and environments.

When you want to easily visualize pipeline status and history in your code hosting platform.

Commands

Check the installed Jenkins version to confirm Jenkins is available on your system.

Terminal

jenkins --version

Expected Output

2.387.1

Check the installed GitLab Runner version to confirm GitLab CI runner is available.

Terminal

gitlab-runner --version

Expected Output

Version:      16.0.0

Git revision: 123abc456def

Git branch:   main

Go version:   go1.20.5

Built:        2024-05-15T12:00:00Z

OS/Arch:      linux/amd64

List all Jenkins jobs configured on the Jenkins server to see existing pipelines.

Terminal

jenkins-cli.jar -s http://localhost:8080 list-jobs

Expected Output

example-pipeline

build-and-test

deploy-to-prod

List all registered GitLab runners to see which runners are available for GitLab CI jobs.

Terminal

gitlab-runner list

Expected Output

Listing configured runners

Runner ID: 1, Description: my-runner, Active: true, Tags: docker,linux

Key Concept

If you remember nothing else, remember: Jenkins is a standalone automation server with many plugins, while GitLab CI is tightly integrated with GitLab and uses runners to execute jobs.

Common Mistakes

Trying to use Jenkins pipeline syntax directly in GitLab CI configuration.

Jenkins and GitLab CI use different pipeline syntax and configuration files, so they are not interchangeable.

Write separate pipeline configurations: Jenkinsfile for Jenkins and .gitlab-ci.yml for GitLab CI.

Assuming GitLab CI does not require any server setup.

GitLab CI requires GitLab Runner to be installed and registered to execute jobs, which is a separate setup step.

Install and register GitLab Runner properly before running GitLab CI pipelines.

Summary

Jenkins is a flexible automation server with many plugins and requires managing its own server.

GitLab CI is integrated with GitLab and uses runners to execute pipeline jobs.

Both tools automate building, testing, and deploying software but differ in setup and configuration.