Sbhalsing0 / docker-java-sample-webapp

A simple java webapp + docker + docker-compose + kubernetes exploration project

docker-java-sample-webapp

Getting started

• Build the java app

mvn clean install

• Take the war file from target & put it into src/main/docker directory.

Docker commands approach

• Go into src/main/docker directory

• Build the docker image

docker build -t tomcat:1 .

• Run the image inside a container

docker container run -p 8080:8080 tomcat:1

• Go to http://localhost:8080/docker-java-sample-webapp-1.0-SNAPSHOT?name=World & see the app running in docker

• List all containers

docker container ls

• Stop container

docker container kill <container-id>

• Remove container

docker rm <container-id>

• List all images

docker images

• Remove image

docker rmi tomcat:1

• Remove base image

docker rmi bitnami/tomcat:latest

Docker compose approach

• Go into src/main/docker directory

• Execute the command

docker-compose up

• When it is stopped, the corresponding containers are deleted also. But images remain. They have to be deleted using commands.

Kubernetes approach

• Use docker edge channel. It has inbuilt kubernetes support.

• To get kubernetes dashboard running

• kubectl cluster-info

• kubectl -n kube-system edit service kubernetes-dashboard

• You should see yaml representation of the service. Change type: ClusterIP to type: NodePort and save file. If it's already changed go to next step.

• kubectl -n kube-system get service kubernetes-dashboard

• Now deploy the war

• Use helm 2.8.2

• helm.exe install .

• To delete entire deployment

• kubectl delete deployment kissing-fish-java-sample-webapp

Extras

• Log into the container

docker exec -it [container-id] bash