Building Docker Image for voting Worker app

build_image_manually_voting_worker_app.md

Clone Repository for Java Worker Process

git clone https://github.com/schoolofdevops/voting-app-worker.git

Launch a intermediate container to install worker app

Create a Container with schoolofdevops/voteapp-mvn:v0.1.0 image

docker run -idt --name interim schoolofdevops/voteapp-mvn:v0.1.0  sh

Copy over the Source Code

cd voting-app-worker 
docker container cp .  interim:/code

Connect to container to compile and package the code

docker exec -it interim sh 

mvn package

Verify jarfile has been built

ls target/

Commit container to an image

• Exit from the container shell
• Note container ID

     
  docker container commit interim  <docker_hub_id>/vote-worker:v0.1.0

Test before pushing by launching container with the packaged app

  docker run -idt  --name test-worker  <docker hub user id >/vote-worker:v0.1.0 java -jar target/worker-jar-with-dependencies.jar

Push Image to registry

Before you push the image, you need to be logged in to the registry, with the docker hub id created earlier. Login using the following command,

docker login 

To push the image, first list it,

docker image ls

[Sample Output]

REPOSITORY                   TAG                 IMAGE ID            CREATED             SIZE
initcron/vote-worker         v0.2.0              90cbeb6539df        18 minutes ago      194MB
initcron/vote-worker         v0.1.0              c0199f782489        34 minutes ago      189MB

To push the image,

docker push initcron/vote-worker:v0.1.0