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Install Maven

  1. Start by updating the package index

    sudo apt update

  2. Next, install Maven by typing the following command

    sudo apt install maven

  3. Verify the installation

    mvn -version

The output should look something like this:

  Apache Maven 3.6.0
  Maven home: /usr/share/maven
  Java version: 11.0.6, vendor: Ubuntu, runtime: /usr/lib/jvm/java-11-openjdk-amd64
  Default locale: en, platform encoding: UTF-8
  OS name: "linux", version: "4.15.0-1057-aws", arch: "amd64", family: "unix"
  root@ip-172-31-91-171:/home/ubuntu/qwerty/kubernetes#

Build with Maven

mvn package

Create Dockerfile

Create file

   vi Dockerfile

Write dockerfile commands script

   FROM openjdk:8-jdk-alpine
   VOLUME /tmp
   ADD target/gs-spring-boot-docker-0.1.0.jar app.jar
   ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

FROM directive defines the base image to use to start the build process.

VOLUME command is used to enable access from your container to a directory on the host machine

ADD command gets two arguments: a source and a destination. It basically copies the files from the source on the host into the container’s own filesystem at the set destinationv

ENTRYPOINT argument sets the concrete default application that is used every time a container is created using the image.

Containerize

  1. Build a docker image using Dockerfile:

    docker build -t web-app .

  2. Run docker image locally

    docker run --rm -p 8080:8080 web-app

  3. Then you can access the web app at http://localhost:8080 in browser.

Or you can pull this sample from my Docker Hub. https://hub.docker.com/repository/docker/tigranabovyan/sample-java-web-app

Deploy to K8S

  1. Create Deployment.(You can change resources limits and requests)
       kubectl create -f deploy.yaml
  1. Create load balancer service.
       kubectl create -f service.yaml
  1. Create Horizontal Pod Autoscaler (you can set your own utilization percentages )
       kubectl create -f hpa.yaml

Then you can access the web app at http://EXTERNAL-IP-OF-LOAD-BALANCER:8080 in browser

To get EXTERNAL-IP of your load balancer service run following command

   kubectl get svc web-app-svc

To monitor your deployment average cpu and memory usage, replicas run following command

   kubectl get hpa web-app-hpa