Simple Web App in K8s Demo

Here is a simple node.js web application along with the required yaml files for deploying it to a Kind Kubernetes cluster. I am using Docker Hub to publish the sample app image and pulling it for all future deployments in my Kind Kubernetes cluster.

build the new image

docker build -t mywebapp:v1.0.0 -f DockerFile .

Verify image

docker scout quickview

Upload the image into the docker hub registry

• docker logout
• docker login -u <<DOCKER_HUB_USER_NAME>>
• docker tag mywebapp:v1.0.0 <<DOCKER_HUB_USER_NAME>>/mywebapp:latest
• docker push <<DOCKER_HUB_USER_NAME>>/mywebapp
• replace the <<DOCKER_HUB_USER_NAME>> with your Docker Hub User Name
• similar steps for Amazon ECR (Elastic Container Registry)
• final image is available at https://hub.docker.com/repository/docker/linuxdock/mywebapp

Test this on a Kind K8s cluster

• kind create cluster -n mywebapp-demo

Deploy the mywebapp

• kubectl apply -f k8s/mywebapp.yaml

Port forward to the app

• kubectl -n staging port-forward svc/mywebapp 8080:8080

Final tests

• curl -XGET http://localhost
• curl -XGET http://localhost/hi
• curl -XGET http://localhost/hello

I hope this will be helpful for someone starting their K8s journey! Cheers,

Matt