Zookeeper StatefulSets from https://github.com/openshift/origin/tree/master/examples/statefulsets/zookeeper

zookeeper.yaml

---
apiVersion: v1
kind: Template
metadata:
  name: zk-cluster
labels:
  template: zk-cluster-template
objects:
- kind: Service
  apiVersion: v1
  metadata:
    annotations:
      service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
    name: zk
    labels:
      app: zk
  spec:
    ports:
    - port: 2888
      name: peer
    - port: 3888
      name: leader-election
    # *.zk.default.svc.cluster.local
    clusterIP: None
    selector:
      app: zk
- kind: StatefulSet
  apiVersion: apps/v1beta1
  metadata:
    name: zoo
  spec:
    serviceName: "zk"
    replicas: 3
    template:
      metadata:
        labels:
          app: zk
        annotations:
          pod.alpha.kubernetes.io/initialized: "true"
          pod.alpha.kubernetes.io/init-containers: '[
              {
                  "name": "install",
                  "image": "gcr.io/google_containers/zookeeper-install:0.1",
                  "imagePullPolicy": "Always",
                  "args": ["--version=3.4.8", "--install-into=/opt", "--work-dir=/work-dir"],
                  "volumeMounts": [
                      {
                          "name": "opt",
                          "mountPath": "/opt/"
                      },
                      {
                          "name": "workdir",
                          "mountPath": "/work-dir"
                      }
                  ]
              },
              {
                  "name": "bootstrap",
                  "image": "java:openjdk-8-jre",
                  "command": ["/work-dir/peer-finder"],
                  "args": ["-on-start=\"/work-dir/on-start.sh\"", "-service=zk"],
                  "env": [
                    {
                        "name": "POD_NAMESPACE",
                        "valueFrom": {
                            "fieldRef": {
                                "apiVersion": "v1",
                                "fieldPath": "metadata.namespace"
                            }
                        }
                     }
                  ],
                  "volumeMounts": [
                      {
                          "name": "opt",
                          "mountPath": "/opt/"
                      },
                      {
                          "name": "workdir",
                          "mountPath": "/work-dir"
                      },
                      {
                          "name": "datadir",
                          "mountPath": "/tmp/zookeeper"
                      }
                  ]
              }
          ]'
      spec:
        containers:
        - name: zk
          image: java:openjdk-8-jre
          ports:
          - containerPort: 2888
            name: peer
          - containerPort: 3888
            name: leader-election
          command:
          - /opt/zookeeper/bin/zkServer.sh
          args:
          - start-foreground
          readinessProbe:
            exec:
              command:
              - sh
              - -c
              - "/opt/zookeeper/bin/zkCli.sh ls /"
            initialDelaySeconds: 15
            timeoutSeconds: 5
          volumeMounts:
          - name: datadir
            mountPath: /tmp/zookeeper
          - name: opt
            mountPath: /opt/
        volumes:
        - name: opt
          emptyDir: {}
        - name: workdir
          emptyDir: {}
    volumeClaimTemplates:
    - metadata:
        name: datadir
        annotations:
          volume.beta.kubernetes.io/storage-class: "default-nfs"
      spec:
        accessModes: [ "ReadWriteOnce" ]
        resources:
          requests:
            storage: 100Mi