Jenkins 管道：在 docker 容器内构建 docker

Question

I'm trying to do the following

1. Checkout the code
2. Do some prechecks using some other docker images (don't want to install these on Jenkins node)
3. Build jar using docker image maven:3.6-jdk-8
4. Then run Dockerfile to build app image
5. Push the image to repository

Now, I don't want to install anything apart from Docker on Jenkins node. I want to run the full pipeline in Docker container to achieve this. What I'm struggling is how to build the 4th step from within the container.

I wrote the Jenkinsfile as below

pipeline {

    agent none
    
    stages {
        stage('Maven build') {
            agent {
                docker {
                    image 'maven:3.6-jdk-8'
                    args '-u root:root'
                }
            }
            steps {
                checkout(
                    [
                        $class: 'GitSCM',
                        branches: [
                            [name: '*/master']
                        ],
                        doGenerateSubmoduleConfigurations: false, 
                        extensions: [], 
                        submoduleCfg: [], 
                        userRemoteConfigs: [
                            [
                                credentialsId: '<cred-id>',
                                url: '<github-url>']
                            ]
                        ])
                        
                sh '''
                    set -eux pipefail

                    mvn -e clean install
                '''
            }
        }
        stage('Build docker image') {
             // Which docker image to use?
        }
    }
}

But I'm not sure how to build a docker image within container. The search didn't help that much. I tried using the Jenkins node for the docker image building but it seems I cannot mix and match. I totally understand this is quite an open question but I think it would be helpful to know the straightforward answer(s).

Answer 1

Have a look at this Jenkins Plugin: https://docs.cloudbees.com/docs/admin-resources/latest/plugins/docker-workflow