Carpet Showdown is a very simple project that demonstrates the usage of Docker to deploy a web-app on the Google Cloud Platform.

Thanks to Docker layer of abstraction, it's easy to deploy the same application on App Engine, Compute Engine or Container Engine.

Each solution has its advantages. Most od the time they can even be combined. For instance, we'll use the App Engine's Cloud DataStore from all three. We will even demonstrate how to connect to the DataStore from another Cloud (heroku).

Run the web-app locally:

mvn clean verify -DskipTests
java -DPROD_MODE=true -jar target/carpet.jar

Run locally with Docker:

docker build -t dgageot/devoxxcarpet .
docker run --rm -ti -p 8080:8080 dgageot/devoxxcarpet

Run locally with Docker using the CloudDataStore:

docker run --rm -ti -e DATASTORE=true -p 8080:8080 dgageot/devoxxcarpet

Run on GCE with docker machine:

docker-machine create --driver google --google-project devoxxcarpet --google-zone europe-west1-d --google-machine-type n1-standard-1 carpet02
docker $(docker-machine config carpet02) ps
docker $(docker-machine config carpet02) build -t dgageot/devoxxcarpet .
docker $(docker-machine config carpet02) run --rm -ti -e DATASTORE=false -p 80:8080 dgageot/devoxxcarpet

Create a docker machine with more scope:

docker-machine create --driver google --google-project devoxxcarpet --google-zone europe-west1-d --google-machine-type n1-standard-1 --google-scopes "https://www.googleapis.com/auth/compute,https://www.googleapis.com/auth/devstorage.read_write,https://www.googleapis.com/auth/datastore,https://www.googleapis.com/auth/logging.write,https://www.googleapis.com/auth/cloud-platform" carpet03

Deploy on App Engine Managed Vms:

gcloud preview app modules delete default --version java
gcloud preview app deploy --version=java .

Run node version:

npm install
npm start

Run node version with appengine dev mode:

npm install
gcloud preview app run .

Deploy node version on App Engine Managed Vms:

mv Dockerfile Dockerfile.java
mv Dockerfile.node Dockerfile

npm install
gcloud preview app modules delete default --version node
gcloud preview app deploy --version=node .

mv Dockerfile Dockerfile.node
mv Dockerfile.java Dockerfile

Push docker image in Google Container registry

docker build -t dgageot/devoxxcarpet .
docker tag -f dgageot/devoxxcarpet gcr.io/devoxxcarpet/java
gcloud preview docker push gcr.io/devoxxcarpet/java

Deploy on Kubernetes

cd kube

gcloud alpha container kubectl create -f web-controller.json
gcloud alpha container kubectl get pods

gcloud alpha container kubectl create -f web-service.json
gcloud alpha container kubectl get services

gcloud compute firewall-rules create devoxxcarpet-80 --allow=tcp:80 --target-tags k8s-cluster-node

gcloud alpha container kubectl resize --replicas=2 rc web-controller

Cleanup Kubernetes Cluster

gcloud alpha container kubectl delete pod devoxxcarpet
gcloud alpha container kubectl get pods

Deploy on Heroku

(Don't forget to commit the private key before pushing to Heroku.

heroku create
heroku buildpack:set https://github.com/heroku/heroku-buildpack-java
git push heroku master
heroku ps:scale web=1
heroku open

heroku config:set DATASTORE=true