NodeJS Hello World application with Docker and Kubernetes

Building and running Docker image

Create the docker image

Excute the below command from the root directory to create the docker image.

$ docker build -t ocel12356/nodejs-helloworld .

Note: With -t tag, I have specified the name of the image which also contains the name of my Docker hub ID. This is one of the best practice to follow when tagging images.

Run the image to verify its working

To run the application, execute the below command:

docker run -p 3000:3000 IMAGE-ID

Push the image to docker hub

docker push ocel12356/nodejs-helloworld

Create a pod in Kubernetes

kubectl create -f pod-nodejs-docker-hw.yml

To access the application on K8s

kubectl port-forward nodejs-docker-hw 8081:3000

curl http://localhost:8081

To access the application on K8s via service

kubectl expose pod nodejs-docker-hw --type=NodePort --name nodejs-hw-service
kubectl describe service nodejs-hw-service

Look for the port number defined for NodePort.