keegoid / kubernetes-example-voting-app

Deploy Docker's example voting app on Kubernetes

Docker Voting App

The Kubernetes Way

1. voting-app (python)
2. in-memory DB (redis)
3. db (PostgreSQL)
4. worker (.NET)
5. result-app (NodeJS)

The Docker Way

1. in-memory DB (redis)
2. db (PostgreSQL)
3. voting-app (python)
4. result-app (NodeJS)
5. worker (.NET)

The Kubernetes Way

Run kubectl commands on GCP or AWS in the following sequence.

voting-app (python)

kubectl create -f voting-app-pod.yml
kubectl create -f voting-app-service.yml

in-memory DB (redis)

kubectl create -f redis-pod.yml
kubectl create -f redis-service.yml

db (PostgreSQL)

kubectl create -f postgres-pod.yml
kubectl create -f postgres-service.yml

worker (.NET)

No service here because no other components rely on the worker pod.

kubectl create -f worker-app-pod.yml

result-app (NodeJS)

kubectl create -f result-app-pod.yml
kubectl create -f result-app-service.yml

The Docker Way

Run docker commands in the following sequence with --links

in-memory DB (redis)

docker run -d --name=redis redis

db (PostgreSQL)

docker run -d --name-db postgres:9.4

voting-app (python)

docker run -d --name=vote -p 5000:80 --link redis:redis voting-app

result-app (NodeJS)

docker run -d --name=result -p 5001:80 --link db:db result-app

worker (.NET)

docker run -d --name=worker --link db:db --link redis:redis worker