How do I build a CI/CD pipeline for Docker basics using Jenkins?

Building a CI/CD pipeline for Docker using Jenkins involves several steps, enabling automated testing and deployment of your applications. Below is a basic guide to help you set up this pipeline.

Firstly, ensure that you have Jenkins installed and running, along with Docker on the same server or machine where Jenkins is hosted.

Steps to Build a CI/CD Pipeline for Docker Basics Using Jenkins

1. Install Required Plugins: Install the Docker and Pipeline plugins through the Jenkins Plugin Manager to enhance Jenkins with Docker capabilities.
2. Create a Jenkins Pipeline Job: Create a new pipeline job by clicking on "New Item" in Jenkins and selecting "Pipeline".
3. Configure Pipeline Script: Write a Jenkinsfile that defines the pipeline stages. An example pipeline is shown below.
4. Setup Docker: Ensure your Jenkins can communicate with the Docker daemon. You may need to add the Jenkins user to the Docker group.
5. Run the Pipeline: Trigger the pipeline build to test if everything is set correctly. Jenkins will execute the stages defined in the Jenkinsfile.

The pipeline might include stages like building a Docker image, running tests, and deploying the image to a remote server.

Here is an example of a simple Jenkins pipeline script:

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                script {
                    docker.build('myapp:${GIT_COMMIT}')
                }
            }
        }
        stage('Test') {
            steps {
                script {
                    docker.image('myapp:${GIT_COMMIT}').inside {
                        sh 'npm test'
                    }
                }
            }
        }
        stage('Deploy') {
            steps {
                script {
                    docker.image('myapp:${GIT_COMMIT}').push('latest')
                }
            }
        }
    }
}