Overview

This tutorial demonstrates how you can run a simple application that reads through a pubsub topic from within your kubernetes cluster, with minimal set-up.

Steps

Set-up assumptions

We will assume that you already have a cluster set-up, with service-catalog, and that you have created a pubsub service instance.

Building the app

You should probably skip this step and use the published image as shown below.

If you want to modify the app, you can build it with

docker build -t ${your_registry}/echo .

And push it to your project registry:

gcloud docker push ${your_registry}/echo

You'll also need to use that location in echo.yaml.

Basic echo

We have a basic echo application that receives HTTP queries, and pushes the body of those queries into the pubsub configured with the service-catalog.

kubectl apply -f echo.yaml

Binding the pubsub with our application

XXX: Create the binding

Pushing data through our application

The following command will connect to our application, which will push "Hello service!" inside the pubsub topic:

kubectl run --rm=true --restart=Never -i -t --image=tutum/curl curl -- curl echo -d "Hello service!"

Make sure it works

Once the data has been pushed to the pubsub, we can verify that it has been received by running this command:

gcloud beta pubsub subscriptions pull echo --auto-ack

Conclusion

Service-catalog is awesome, and let's you seamlessly connect to other GCP services from within your Kubernetes cluster.

Incomplete parts

I'm not sure how to create the bindings yet, and I definitely don't read the proper values from the secret, as I don't have a running example of the service-catalog.