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Create a Docker Image With Our Application

Now our application is ready to be used as a result of successful Package job run. In this chapter, we are going to...

  • Copy the artifact from the package job
  • Build a Docker image with our application in it.

Pre-requisites

(Note: Visit hub.docker.com and create a DockerHub account if you don't have one already.)

Requisite 1 - Install Copy Artifacts Plugin

  • Before creating this job, please install copy artifacts plugin which is also a prerequisite.

plugin

Requisite 2 - Install CloudBees Docker Plugin

  • Install CloudBees Docker Build and Publish Plugin

docker

Requisite 3 - Set up Docker Environment for Jenkins

  • After installing that plugin, go to `Credentials => global(global domain) => Add credentials => fill in the details

creds

creds

creds

creds

  • Now go back to Jenkins Main Page

Requisite 4 - Fork the docker repository

  • Fork the following repository.
https://github.com/initcron/CI-Vertx.git

  • This repository consists of one Dockerfile which you need to update.

  • Let us see what this Dockerfile does,

Requisite 5 - The Dockerfile

  • The Dockerfile is very simple and has only three steps.
FROM tomcat:latest
ADD target/CMADSession*.war /usr/local/tomcat/webapps/cmad.war
ADD setenv.sh /usr/local/tomcat/bin/setenv.sh

Line 1

FROM tomcat:latest

We are building our image with official tomcat image as a Base image.

Line 2

ADD CMADSession*.war.war /usr/local/tomcat/webapps/cmad.war

Here we copy our application from the host to container.

Line 3

ADD setenv.sh /usr/local/tomcat/bin/setenv.sh

Like the previous step, we add a script inside the image. The purpose of this script is to decrease the launch time of the application. The script has following contents.

# Fast up the server boot process
export JAVA_OPTS="$JAVA_OPTS -Djava.security.egd=file:/dev/./urandom"

Docker-Image Job

  • This time create a freestyle project named Docker-Image.

  • In Source Code Management step, add the following git repository.

https://github.com/initcron/CI-Vertx.git
  • In Build Trigger, add Package as a trigger.

repo

  • Click on apply project for now.

Build Environment

clear

This job requires workspace to be cleared before it runs. So,

  • In Build Environment step, Select Delete workspace before build starts then click on Advanced.

  • In Patterns for files to be deleted section, click on Add.

  • In the second field add target/*.war as a pattern.

Copy the artifact from Package

last

  • In Build Step, Copy artifacts from another project from the drop down list.

  • In Project name, Type Package.

  • Select Latest successful build in the next section.

  • In artifacts to copy section, type target/*.war

  • This will copy our application from Package job to Docker-Image job.

Let's Build the Image

  • This job has one Build step.

  • Select Docker Build and Publish from the Build step

docker-plugin

  • Add the following details in the fields.

docker-plugin

  • Then click on Save.

  • Now you can run the Docker-Image job

If everything goes well, this job will create a Docker image and push it to DockerHub registry.

👈Prev Chapter 13: Deploy Application to Tomcat

👉 Next Chapter 15: Deploy application Using Docker Compose