k8s 上使用 StatefulSet 部署 zookeeper 集群

目录

• StatefulSet 部署 zookeeper 集群
  • 创建pv
  • StatefulSet
  • 测试

StatefulSet 部署 zookeeper 集群

参考 k8s官网zookeeper集群的部署，数据挂着方式改成通过本地方式创建的pv； https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/

本次共享存储使用的是 NFS；

创建pv

[root@node01 zk-cluster]# cat zk-pv.yaml 
apiVersion: v1
kind: PersistentVolume
metadata: 
  name: zk-01
  labels:
    name: zk-cluster
    type: nfs
spec:
  nfs:
    path: /data/zk-cluster/zk-01
    server: 192.168.1.91
  accessModes: 
  - "ReadWriteOnce"
  capacity:
    storage: 5Gi
  persistentVolumeReclaimPolicy: Recycle
---
apiVersion: v1
kind: PersistentVolume
metadata: 
  name: zk-02
  labels:
    name: zk-cluster
    type: nfs
spec:
  nfs:
    path: /data/zk-cluster/zk-02
    server: 192.168.1.91
  accessModes: 
  - "ReadWriteOnce"
  capacity:
    storage: 5Gi
  persistentVolumeReclaimPolicy: Recycle
---
apiVersion: v1
kind: PersistentVolume
metadata: 
  name: zk-03
  labels:
    name: zk-cluster
    type: nfs
spec:
  nfs:
    path: /data/zk-cluster/zk-03
    server: 192.168.1.91
  accessModes: 
  - "ReadWriteOnce"
  capacity:
    storage: 5Gi
  persistentVolumeReclaimPolicy: Recycle

StatefulSet

[root@node01 zk-cluster]# cat statefulset-zk.yaml 
apiVersion: v1
kind: Service
metadata:
  name: zk-hs
  labels:
    app: zk
spec:
  ports:
  - port: 2888
    name: server
  - port: 3888
    name: leader-election
  clusterIP: None
  selector:
    app: zk
---
apiVersion: v1
kind: Service
metadata:
  name: zk-cs
  labels:
    app: zk
spec:
  ports:
  - port: 2181
    name: client
  selector:
    app: zk
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
  name: zk-pdb
spec:
  selector:
    matchLabels:
      app: zk
  maxUnavailable: 1
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zk
spec:
  selector:
    matchLabels:
      app: zk
  serviceName: zk-hs
  replicas: 3
  updateStrategy:
    type: RollingUpdate
  podManagementPolicy: OrderedReady
  template:
    metadata:
      labels:
        app: zk
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - zk
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: kubernetes-zookeeper
        #imagePullPolicy: Always
        imagePullPolicy: ifNotPresent
        image: "registry.k8s.com/test/zookeeper:1.0-3.4.10"
        resources:
          requests:
            memory: "1Gi"
            cpu: "0.5"
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: server
        - containerPort: 3888
          name: leader-election
        command:
        - sh
        - -c
        - "start-zookeeper 
          --servers=3 
          --data_dir=/var/lib/zookeeper/data 
          --data_log_dir=/var/lib/zookeeper/data/log 
          --conf_dir=/opt/zookeeper/conf 
          --client_port=2181 
          --election_port=3888 
          --server_port=2888 
          --tick_time=2000 
          --init_limit=10 
          --sync_limit=5 
          --heap=512M 
          --max_client_cnxns=60 
          --snap_retain_count=3 
          --purge_interval=12 
          --max_session_timeout=40000 
          --min_session_timeout=4000 
          --log_level=INFO"
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        volumeMounts:
        - name: datadir
          mountPath: /var/lib/zookeeper
      securityContext:
        # runAsUser: 1000
        fsGroup: 1000
  volumeClaimTemplates:
  - metadata:
      name: datadir
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 5Gi

测试

查看每台机器的myid

[root@node01 zk-cluster]# for i in 0 1 2; do echo "myid zk-$i";kubectl exec zk-$i -- cat /var/lib/zookeeper/data/myid; done
myid zk-0
1
myid zk-1
2
myid zk-2
3

要获取zkStatefulSet 中每个Pod的完全合格域名（FQDN），请使用以下命令

[root@node01 zk-cluster]# for i in 0 1 2; do kubectl exec zk-$i -- hostname -f; done
zk-0.zk-hs.default.svc.cluster.local
zk-1.zk-hs.default.svc.cluster.local
zk-2.zk-hs.default.svc.cluster.local