Code from Kubernetes Webinar Series - Kubernetes Architecture 101

https://www.youtube.com/watch?v=zeS6OyDoy78&t=2839s

Narrative for this demo

1. BUILD: build image locally on your laptop: docker build . -t <DOCKER_HUB_USER>/web (then push the image to registry)

2. DEPLOY: run app locally on your laptop: docker-compose up -d

3. DEPLOY: run app on K8s cluster: kubectl create -f

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 Build-Docker
docker build . -t <DOCKER_HUB_USER>/web
docker login
docker push <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 ../Deploy-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>