Usage

Create a GKE cluster

Create a GKE cluster as per Google Container Engine docs. Pull down the kubeconfig and all credentials.
Setup a separate service account for docker registry and pull down its json key

Install Kubernetes Helm

Build Helm from source, as described in https://github.com/kubernetes/helm
Run

helm init

Create required Kubernetes secrets

Create the three secrets:

kubectl create secret generic gce-key-secret --from-file=keyfile=<PATH TO YOUR DOCKER REGISTRY SERVICE ACCOUNT KEY> --namespace=helm
kubectl create secret generic registry-http-secret --from-literal=secret=<SOME RANDOM STRING OF CHARACTERS> --namespace=helm
kubectl create secret generic kubeconfig-secret --from-file=config=<PATH TO YOUR KUBECONFIG FILE> --namespace=helm

Install registry chart

Install the chart by running

cd pkg/registry_helm
helm install .

Wait for cluster external IP to populate

Run

kubectl get service docker-registry --namespace=helm --watch

and wait for EXTERNAL-IP to fill out.

Make sure your docker daemon can talk to an insecure registry

Create a docker-machine instance with

'--engine-insecure-registry "<EXTERNAL-IP OF REGISTRY SERVICE>:5000"' 

parameter. If you are not using docker machine, just modify your docker daemon setting with the same switch, and restart it.

Build gocd server and agent images and push them to the registry

Go to build/gocd/agent and

docker build -t <EXTERNAL-IP OF REGISTRY SERVICE>:5000/gocd-agent .
docker push <EXTERNAL-IP OF REGISTRY SERVICE>:5000/gocd-agent

Then, go to build/gocd/server and

docker build -t <EXTERNAL-IP OF REGISTRY SERVICE>:5000/gocd-server .
docker push <EXTERNAL-IP OF REGISTRY SERVICE>:5000/gocd-server

Create TOML values for gocd chart

Create a values.toml file somewhere with the following line in it:

NOTE the CLUSTER-IP, not EXTERNAL-IP here

privateRegistry = "<CLUSTER-IP OF REGISTRY SERVICE>:5000"

Deploy gocd chart

cd pkg/gocd_helm
helm install . --values <PATH TO TOML VALUES FILE>

Check out the gocd installation

Once the external ip of gocd kubernetes service populates you should be able to visit

http://<EXTERNAL IP OF GOCD SERVICE>:8153/

and trigger a "pipeline" - which will end up using docker-in-docker to build and tag containers, and kubectl to interact with the kubernetes cluster it is running in.