1 node(s) had taints that the pod didn't tolerate.
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集群中有个节点被污染了，查看节点信息，发现其中一个节点没有起来，导致只能启动2个pod
2 PV和PVC上的坑
一个zk.yaml中需要创建3个zookeeper，根据zookeeper集群的特性，三个zookeeper需要三个不同的数据目录（如果再添加日志目录也是一样），集群才会正常起来
创建PV的时候需要创建三个不同的PV
在一个zk.yaml中，PVC需要关联到后端不同的三个PVC，如果按照传统的创建PVC，并在zk.yaml中指定PVC的名字，只能指定一个名字，这样是办不到关联到三个不同的PV，于是需要volumeClaimTemplates（PVC模板），模板accessModes需要ReadWriteOnce,ReadWriteMany会关联失败。
volumeClaimTemplates: - metadata: name: datadir spec: accessModes: [ "ReadWriteOnce" ] resources: requests: storage: 1Gi
如果是用动态pvc供给，也是一样需要创建PVC模板
3 zookeeper提供给外部访问
zookeeper由于是使用statefulSet部署，使用到了无头服务，如果提供给外部访问呢？办法就是增加一个专门为外部访问的service。
1 在192.168.0.11上创建安装nfs，并配置启动nfs
2 在每个node节点上下载nfs
3 在matser节点创建zk使用的PV
apiVersion: v1 kind: PersistentVolume metadata: name: zk-data1 spec: capacity: storage: 1Gi accessModes: - ReadWriteOnce nfs: server: 192.168.0.11 path: /data/zk/data1 --- apiVersion: v1 kind: PersistentVolume metadata: name: zk-data2 spec: capacity: storage: 1Gi accessModes: - ReadWriteOnce nfs: server: 192.168.0.11 path: /data/zk/data2 --- apiVersion: v1 kind: PersistentVolume metadata: name: zk-data3 spec: capacity: storage: 1Gi accessModes: - ReadWriteOnce nfs: server: 192.168.0.11 path: /data/zk/data3
4 在master节点上创建zookeeper的创建pod的yaml文件
参考官方文档：https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/
官方文档中的镜像地址为国外地址，我这里网上找了一个可用的地址，跟官方镜像一样
[root@localhost zk]# cat 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: type: NodePort ports: - port: 2181 targetPort: 2181 name: client nodePort: 2181 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: zok spec: serviceName: zk-hs replicas: 3 selector: matchLabels: app: zk 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 image: leolee32/kubernetes-library:kubernetes-zookeeper1.0-3.4.10 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 volumeClaimTemplates: - metadata: name: datadir spec: accessModes: [ "ReadWriteOnce" ] resources: requests: storage: 1Gi
5 查看集群状态
for i in 0 1 2; do kubectl exec zok-$i zkServer.sh status; done
6 外部访问zookeeper集群（使用本机电脑访问）
