simple-java-maven-app

This repository is for the Build a Java app with Maven tutorial in the Jenkins User Documentation.

The repository contains a simple Java application which outputs the string "Hello world!" and is accompanied by a couple of unit tests to check that the main application works as expected. The results of these tests are saved to a JUnit XML report.

The jenkins directory contains an example of the Jenkinsfile (i.e. Pipeline) you'll be creating yourself during the tutorial and the scripts subdirectory contains a shell script with commands that are executed when Jenkins processes the "Deliver" stage of your Pipeline.

Docker in Docker

stop all docker images running on port 8080 or change the port number

1.Go to your cmd run this command

docker run -p 8080:8080 -v /var/run/docker.sock:/var/run/docker.sock --name jenkins jenkins/jenkins:lts

we will get an initial admin password do the jenkins installation steps

After completion of jenkins installation

2.To enter into your docker image run this command

docker exec -it -u root jenkins bash

3.install docker in docker

apt-get update && \
apt-get -y install apt-transport-https \
     ca-certificates \
     curl \
     gnupg2 \
     software-properties-common && \
curl -fsSL https://download.docker.com/linux/$(. /etc/os-release; echo "$ID")/gpg > /tmp/dkey; apt-key add /tmp/dkey && \
add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") \
   $(lsb_release -cs) \
   stable" && \
apt-get update && \
apt-get -y install docker-ce

now you will be inside your docker and run '''docker ps''' you will get something like this

root@cf1fd5908a1c:/# docker ps
CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                               NAMES
cf1fd5908a1c        jenkins/jenkins:lts   "/sbin/tini -- /usr/…"   2 hours ago         Up 12 minutes       0.0.0.0:8080->8080/tcp, 50000/tcp   jenkins
root@cf1fd5908a1c:/#   

this means you have succesfully created the image

Now to give jenkins actions access to all users for that run this command

chmod 777 /var/run/docker.sock

run your jenkins pipeline

pipeline{
  agent {
    docker {
      image 'maven:3-alpine'
      args '-v /root/.m2:/root/.m2'
    }
  }
  stages {
    stage('Build'){
      steps{
        sh 'mvn -B -DskipTests clean package'
      }
     }
    stage('Test'){
      steps{
        sh 'mvn test'
      }
      
  }
  }
}

jenkins console output

[INFO] Surefire report directory: /var/jenkins_home/workspace/maven-pipeline/target/surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.mycompany.app.AppTest
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.033 sec

Results :

Tests run: 2, Failures: 0, Errors: 0, Skipped: 0

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.143 s
[INFO] Finished at: 2021-02-12T09:28:29Z
[INFO] Final Memory: 9M/171M
[INFO] ------------------------------------------------------------------------
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
$ docker stop --time=1 89e4dc8d03b3087474e8c6e6b0911d5c7d5b18138c32d6b371a4123487c42cec
$ docker rm -f 89e4dc8d03b3087474e8c6e6b0911d5c7d5b18138c32d6b371a4123487c42cec
[Pipeline] // withDockerContainer
[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS