How to integrate Jenkins with Docker?

Short answer

Integrate Jenkins with Docker by running builds inside Docker containers or using Docker agents. This ensures a clean, consistent environment for every build.

Steps

1. Install the Docker Pipeline plugin.
2. Define a Docker agent in the Jenkinsfile.
3. Mount the Docker socket for Docker-in-Docker if needed.

Example

pipeline {
    agent {
        docker {
            image 'node:18'
            args '-v /var/run/docker.sock:/var/run/docker.sock'
        }
    }
    stages {
        stage('Build') {
            steps {
                sh 'npm ci'
                sh 'docker build -t myapp .'
            }
        }
    }
}

Tips

• Use specific image tags for reproducibility.
• Cache layers with BuildKit in CI.
• Clean up containers after builds.

Common issues

• Docker socket access is a security risk.
• Container permissions may mismatch the host.
• Large images slow down pipeline startup.