Containerize Java micro-services using CircleCI

Command to test maven project:

## Test Java WebApplication 
mvn test
## Test and build Java WebApplication  
mvn clean install

Command to build docker image and push it to docker registry:

• Build docker image: docker build -t $DOCKER_REGISTRY/java-webapp .
• Run docker container: docker run -d -p 8080:8080 $DOCKER_REGISTRY/java-webapp
• Test container accessing application in browser http://localhost:8080/
• Login to Artifactory docker registry: docker login -u $USER -p $PASSWORD $DOCKER_REGISTRY
• Push docker image: docker push $DOCKER_REGISTRY/java-webapp

Steps to build docker images using CircleCI and push it to docker registry.

Step 1:

copy .circleci/config.yml to your project

Step 2:

Add your project in Circle CI.

Step 3:

add Environment Variables $DOCKER_REGISTRY, USER, PASSWORD in Environment Variables settings of Circle CI.

$DOCKER_REGISTRY ->  Docker Registry URL 
e.g  $DOCKER_REGISTRY -> https://mycompany.docker.io/
USER -> Docker Registry User which has permission to deploy artifacts.
e.g USER -> admin
PASSWORD -> Password for Docker Registry User.
e.g PASSWORD -> password

Steps to build helm chart and deploy Java Webapp to Kubernetes using helm:

Prerequisites Details

• Kubernetes 1.8+
• helm 2.8+

Step 1: Package helm chart:

helm package java-webapp

Step 2: Deploy Java Webapp to Kubernetes:

helm install --name java-webapp  java-webapp-1.0.0.tgz

Step 3: Check status of helm deployment

helm status java-webapp

Setp 4: Access Java Webapp

export SERVICE_IP=$(kubectl get svc --namespace default java-webapp -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
echo http://$SERVICE_IP:80

Congratulation You have just containerize Java micro-services and deployed it to Kubernetes.