L11-Publish_docker_image.md

Build and Publish a Docker image

1. Write and add dockerfile in the source code

   	FROM openjdk:8
   	ADD jarstaging/com/valaxy/demo-workshop/2.0.2/demo-workshop-2.0.2.jar demo-workshop.jar
   	ENTRYPOINT ["java", "-jar", "demo-workshop.jar"]

   Check-point: version number in pom.xml and dockerfile should match

2. Create a docker repository in the Jfrog
   repository name: valaxy-docker

3. Install docker pipeline plugin

4. Update Jenkins file with the below stages

      def imageName = 'valaxy01.jfrog.io/valaxy-docker/ttrend'
      def version   = '2.0.2'
       stage(" Docker Build ") {
         steps {
           script {
              echo '<--------------- Docker Build Started --------------->'
              app = docker.build(imageName+":"+version)
              echo '<--------------- Docker Build Ends --------------->'
           }
         }
       }
   
               stage (" Docker Publish "){
           steps {
               script {
                  echo '<--------------- Docker Publish Started --------------->'  
                   docker.withRegistry(registry, 'artifactory_token'){
                       app.push()
                   }    
                  echo '<--------------- Docker Publish Ended --------------->'  
               }
           }
       }

Check-point:

1. Provide jfrog repo URL in the place of valaxy01.jfrog.io/valaxy-docker in def imageName = 'valaxy01.jfrog.io/valaxy-docker/ttrend'
2. Match version number in def version = '2.0.2' with pom.xml version number
3. Ensure you have updated credentials in the field of artifactory_token in docker.withRegistry(registry, 'artifactory_token'){

Note: make sure docker service is running on the slave system, and docker should have permissions to /var/run/docker.sock