build image

docker build -t charlie/nodejs_k8s .

Re-build the image and notice Docker re-using previous layers:

docker run --rm -d -p 3000:3000 charlie/nodejs_k8s

Stop the container:

docker stop CONTAINER_ID

Push the image to DockerHub:

docker push charlie/nodejs_k8s

ref: https://www.digitalocean.com/community/tech-talks/how-to-deploy-a-resilient-node-js-application-on-kubernetes-from-scratch

Kubernetes

Get worker nodes:

kubectl get nodes

Create a deployment:

kubectl create deployment --image charlie/nodejs_k8s node-app

Scale up to 3 replicas:

kubectl scale deployment node-app --replicas 3

Expose the deployment as a NodePort replica:

 kubectl expose deployment node-app --type=NodePort --port 3000

Look at the newly created service (and the assigned port):

kubectl get services

Grab the public IP of one of the worker nodes:

kubectl get nodes -o wide

Browse to IP:port to test the service Edit the service:

kubectl edit service node-app

Replace port: 3000 with port: 80

Replace type: NodePort with type: LoadBalancer

Verify that the service was updated:

kubectl get service

Run the above command every few seconds until you get the external IP address of the Load Balancer Browse to the IP of the Load Balancer