Adds storage class for Zookeeper, with sample manifests

This reverts commit efb1019.

README.md

@@ -27,6 +27,12 @@ The goal is to provide [Bootstrap servers](http://kafka.apache.org/documentation
 
 Zookeeper at `zookeeper.kafka.svc.cluster.local:2181`.
 
+## Prepare storage classes
+
+For Minikube run `kubectl create -f configure-minikube/`.
+
+There's a similar setup for GKE, in `configure-gke` of course. You might want to tweak it before creating.
+
 ## Start Zookeeper
 
 The [Kafka book](https://www.confluent.io/resources/kafka-definitive-guide-preview-edition/) recommends that Kafka has its own Zookeeper cluster with at least 5 instances.

configure-gke/storageclass-zookeeper-gke.yml

@@ -0,0 +1,7 @@
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: kafka-zookeeper
+provisioner: kubernetes.io/gce-pd
+parameters:
+  type: pd-ssd

configure-minikube/storageclass-zookeeper-minikube.yml

@@ -0,0 +1,5 @@
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: kafka-zookeeper
+provisioner: k8s.io/minikube-hostpath

zookeeper/50pzoo.yml

@@ -61,8 +61,10 @@ spec:
   volumeClaimTemplates:
   - metadata:
       name: data
+      annotations:
+        volume.beta.kubernetes.io/storage-class: kafka-zookeeper
     spec:
       accessModes: [ "ReadWriteOnce" ]
       resources:
         requests:
-          storage: 10Gi
+          storage: 1Gi