Jenkins 2019 in Docker(3)Blue Ocean and Pipeline

Jenkins 2019 in Docker(3)Blue Ocean and Pipeline
Enable Blue Ocean
‘Manage Jenkins’ -> ‘Manage Plugins’ -> ‘Available’ -> Check ‘Blue Ocean’ and ‘Download now and install after restart'
Restart Jenkins when installation is complete and no jobs are running.
Click the Button ‘Open Blue Ocean’ to go to new UI or directly visit
http://server/blue
Follow the UI to create a new pipeline
In GitHub.com in the Settings-> Developer Settings -> Personal Access Tokens -> Generate new token
133ad445xxxxxxxxxa6cf9cff2
In jenkins, Credentials -> System -> Global credentials -> Secret Text
Put the token in Secret, Give an ID as Jenkins
More Examples
https://jenkins.io/doc/pipeline/examples/
https://github.com/jenkinsci/pipeline-examples
Cache the maven libraries
https://jenkins.io/doc/book/pipeline/docker/
Currently, I am using the simplest configuration file Jenkinsfile
pipeline {
  agent {
    docker {
      image 'maven:3.6.0-jdk-11'
      args '-v $HOME/.m2:/root/.m2'
    }
  }
  stages {
    stage('Clone Code') {
      steps {
        git(url: 'https://github.com/sillycat/NetsuiteConnector', branch: 'master', changelog: true, poll: true, credentialsId: 'yiyikang')
      }
    }
    stage('Compile Build') {
      steps {
        sh 'mvn clean'
        sh 'mvn install -DskipTests=true'
      }
    }
    stage('Unit Test') {
      steps {
        sh 'mvn test'
      }
    }
  }
}
Agent Docs to build with Dockerfile
https://jenkins.io/doc/book/pipeline/syntax/#agent
Use docker ENV to build the application, Dockerfile.build
FROM maven:3.6.0-jdk-11    
MAINTAINER  Yiyi Kang <[e-mail]>
RUN apt-get -qq update
RUN apt-get -qqy dist-upgrade
RUN curl -fsSL https://get.docker.com | sh
Jenkinsfile
pipeline {
  options {
    buildDiscarder(logRotator(numToKeepStr: '10'))
  }
  agent {
    dockerfile {
      filename 'Dockerfile.build'
      args '-v $HOME/.m2:/root/.m2 -v /var/run/docker.sock:/var/run/docker.sock'
    }
  }
  stages {
    stage('Clone Code') {
      steps {
        git(url: 'https://github.com/sillycat/NetsuiteConnector', branch: 'master', changelog: true, poll: true, credentialsId: 'yiyikang')
      }
    }
    stage('Compile Build') {
      steps {
        sh 'mvn clean'
        sh 'mvn install -DskipTests=true'
      }
    }
    stage('Unit Test') {
      steps {
        sh 'mvn test'
      }
    }
    stage('Docker Image') {
      steps {
        sh 'docker build -t sillycat/public:sillycat-netsuite .'
      }
    }
  }
}
It will build the building ENV in Dockerfile.build, then Jenkinsfile will use that ENV to build.
References:
https://jenkins.io/zh/doc/book/blueocean/getting-started/
https://blog.csdn.net/neven7/article/details/53645215
https://jenkins.io/zh/doc/pipeline/tour/hello-world/
https://github.com/jenkinsci/pipeline-examples
https://medium.com/@gustavo.guss/jenkins-building-docker-image-and-sending-to-registry-64b84ea45ee9
https://jenkins.io/doc/book/pipeline/docker/
https://stackoverflow.com/questions/39542485/how-to-write-pipeline-to-discard-old-builds