ZooKeeper 服务
服务类型: 无头服务（clusterIP: None），这是 StatefulSet（有状态集）必需的配置。
端口:
2181 (客户端): 用于客户端连接。
2888 (跟随者): 用于 ZooKeeper 服务器之间的连接。
3888 (领导者): 用于领导者选举。
选择器: 选择带有 app: zookeeper 标签的 Pod。
ZooKeeper 有状态集 (StatefulSet)
副本数: 3（用于 ZooKeeper 的法定人数，保证集群可用性）。
服务名称: zookeeper（关联到上面的无头服务）。
环境变量:
ZOO_MY_ID: 根据 Pod 名称动态分配，例如 zookeeper-0、zookeeper-1、zookeeper-2。
ZOO_SERVERS: 定义集群中的服务器，确保它们可以相互通信。
数据卷挂载:
将 data 卷挂载到 /data 目录，存储 ZooKeeper 的数据。
持久化存储
PersistentVolume: 虽然配置中没有显示，但通常会通过 PersistentVolume 或动态存储供应配置持久存储。
VolumeClaimTemplates: 每个 ZooKeeper Pod 都有自己的 10Gi 存储，确保在 Pod 重启时数据不会丢失。
额外注意事项:
高可用性: 这个配置设计用于生产环境，具备高可用性和数据持久性。
动态 DNS: StatefulSet 中的 Pod 会有稳定的 DNS 名称，例如 zookeeper-0.zookeeper、zookeeper-1.zookeeper、zookeeper-2.zookeeper。

拉取镜像

docker pull registry.cn-hangzhou.aliyuncs.com/qiluo-images/zookeeper:latest

vi zookeeper-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: zookeeper
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: zookeeper
  template:
    metadata:
      labels:
        app: zookeeper
    spec:
      containers:
      - name: zookeeper
        image: registry.cn-hangzhou.aliyuncs.com/qiluo-images/zookeeper:latest
        ports:
        - containerPort: 2181
        env:
        - name: ZOOKEEPER_SERVER_ID
          value: "1"
        - name: ZOOKEEPER_CLIENT_PORT
          value: "2181"
        - name: ZOOKEEPER_DATA_DIR
          value: "/data"
        volumeMounts:
        - name: zookeeper-data
          mountPath: /data
      volumes:
      - name: zookeeper-data
        emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
  name: zookeeper
  namespace: default
spec:
  ports:
  - port: 2181
    targetPort: 2181
  selector:
    app: zookeeper

创建 zookeeper-pv.yaml

vi zookeeper-pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: zookeeper-pv
spec:
  accessModes:
    - ReadWriteOnce
  capacity:
    storage: 10Gi
  hostPath:
    path: /mnt/data/zookeeper
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: zookeeper-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi

创建 zookeeper-statefulset.yaml

vi zookeeper-statefulset.yaml

apiVersion: v1
kind: Service
metadata:
  name: zookeeper
  labels:
    app: zookeeper
spec:
  ports:
    - port: 2181
      name: client
    - port: 2888
      name: follower
    - port: 3888
      name: leader
  clusterIP: None
  selector:
    app: zookeeper
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zookeeper
spec:
  serviceName: zookeeper
  replicas: 3
  selector:
    matchLabels:
      app: zookeeper
  template:
    metadata:
      labels:
        app: zookeeper
    spec:
      containers:
      - name: zookeeper
        image: registry.cn-hangzhou.aliyuncs.com/qiluo-images/zookeeper:latest
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: follower
        - containerPort: 3888
          name: leader
        env:
        - name: ZOO_MY_ID
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: ZOO_SERVERS
          value: "server.1=zookeeper-0.zookeeper:2888:3888;2181 server.2=zookeeper-1.zookeeper:2888:3888;2181 server.3=zookeeper-2.zookeeper:2888:3888;2181"
        volumeMounts:
        - name: data
          mountPath: /data
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 10Gi

第二种方法
PersistentVolume 和 PersistentVolumeClaim
首先，定义 PersistentVolume 和 PersistentVolumeClaim，这样 ZooKeeper 的数据可以持久化。

vi  zookeeper-pv-pvc.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: zookeeper-pv
spec:
  accessModes:
    - ReadWriteOnce
  capacity:
    storage: 10Gi
  hostPath:
    path: /mnt/data/zookeeper
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: zookeeper-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi

vi zookeeper-deployment.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zookeeper
  namespace: default
spec:
  serviceName: "zookeeper"
  replicas: 3
  selector:
    matchLabels:
      app: zookeeper
  template:
    metadata:
      labels:
        app: zookeeper
    spec:
      containers:
      - name: zookeeper
        image: registry.cn-hangzhou.aliyuncs.com/qiluo-images/zookeeper:latest
        ports:
        - containerPort: 2181
        - containerPort: 2888
        - containerPort: 3888
        env:
        - name: ZOO_MY_ID
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: ZOO_SERVERS
          value: "zookeeper-0.zookeeper:2888:3888,zookeeper-1.zookeeper:2888:3888,zookeeper-2.zookeeper:2888:3888"
        volumeMounts:
        - name: zookeeper-data
          mountPath: /data
      volumeClaimTemplates:
      - metadata:
          name: zookeeper-data
        spec:
          accessModes: ["ReadWriteOnce"]
          resources:
            requests:
              storage: 10Gi
---
apiVersion: v1
kind: Service
metadata:
  name: zookeeper
  namespace: default
spec:
  ports:
  - port: 2181
    targetPort: 2181
  - port: 2888
    targetPort: 2888
  - port: 3888
    targetPort: 3888
  clusterIP: None
  selector:
    app: zookeeper

kubectl apply -f zookeeper-deployment.yaml

kubectl apply -f zookeeper-pv-pvc.yaml

这样命令简单了许多。