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kubernetes-101

Tutorial to build and deploy a simple Python app in Kubernetes. The walkthrough is available here.

Make sure that you have access to a Kubernetes cluster.

Build a Docker image from existing Python source code and push it to Docker Hub. Replace DOCKER_HUB_USER with your Docker Hub username.

cd Docker
docker build -t <DOCKER_HUB_USER>/web .
docker push <DOCKER_HUB_USER>/web

Change the Docker composition to use your image

Edit and replace docker-compose.yml to <DOCKER_HUB_USER>/web

Launch the app with Docker Compose

docker-compose up -d

Test the app

curl localhost:3000

Deploy the app to Kubernetes

cd ../Kubernetes
kubectl create -f db-pod.yml
kubectl create -f db-svc.yml
kubectl create -f web-pod.yml
kubectl create -f web-svc.yml
kubectl create -f web-rc.yml

Check that the Pods and Services are created

kubectl get pods
kubectl get svc

Get the NodePort for the web Service. Make a note of the port.

kubectl describe svc web

Test the app by accessing the NodePort of one of the nodes.

kubectl get nodes
curl <NODE_IP>:<NODEPORT>