This repo accompanies GridGain's Kubernetes Workshop, and demonstrates some of the concepts discussed.

The code sets up a relatively minimal GridGain cluster and connects a SpringBoot REST client to it. It should run in pretty much any Kuberenetes environment, including MiniKube and Docker Desktop. See below for some magic incantations that are required for specific versions of Kubernetes.

Create the cluster in the "ignite" namespace with the following commands.

kubectl apply -f ignite-namespace.yaml
kubectl create -f ignite-service.yaml -n ignite
kubectl create -f ignite-serviceaccount.yaml -n ignite
kubectl create configmap ignite-config --from-file=ignite-config.xml -n ignite
kubectl create configmap ignite-licence --from-file=gridgain-license.xml -n ignite
kubectl apply -n ignite -f ignite-credentials.yaml
kubectl apply -f ignite-statefulset.yaml -n ignite

Since the cluster is persistent, you'll need to activate the cluster. The simplest option is to use Control Center. You can also exec into one of the pods and run control.sh.

The client is a SpringBoot/SpringData application that connects to the GridGain servers as a thin-client. After you've built the image and uploaded it to a registry (if necessary), you can run it with the following command.

kubectl apply -f ignite-client.yaml -n ignite

Example calling the client program, using httpie:

$ http POST http://localhost/person/ id=10 name=Jeremy height=180
HTTP/1.1 200 
Connection: keep-alive
Content-Type: application/json
Date: Wed, 07 Jun 2023 16:59:01 GMT
Keep-Alive: timeout=60
Transfer-Encoding: chunked

{
    "height": 180,
    "id": 10,
    "name": "Jeremy"
}


$ http http://localhost/person/10
HTTP/1.1 200 
Connection: keep-alive
Content-Type: application/json
Date: Wed, 07 Jun 2023 16:59:11 GMT
Keep-Alive: timeout=60
Transfer-Encoding: chunked

{
    "height": 180,
    "id": 10,
    "name": "Jeremy"
}

To access the cluster from outside of the Kubernetes (cluster), you'll need to set up a tunnel.

minikube tunnel

The nice thing about MiniKube is that comes with the Kubernetes Dashboard. You can launch it with:

minikube dashboard