介绍
官方文档https://kubernetes.io/zh/docs/tutorials/stateful-application/zookeeper/
在部署之前,你需要熟悉以下Kubernetes概念
根据官方要求,zookeeper部署在Kubernetes集群需要具备如下要求
-
- node节点资源至少四个节点的集群,每个节点至少 2 CPUs 和 4 GiB 内存
如果在云平台部署zookeeper集群,需要学习相关云厂商的持久化存储,如何与Kubernetes集群融合
配置过程
整个部署分为以下几个步骤(为了细化官方文档部署过程,以下具体的分段),官方文档给出的example.yaml有缺少遗漏的部分,在下文一一指出,如下
- 创建StorageClass
- 创建PersistentVolumeClaim
- 创建Headless Service
- 创建PodDisruptionBudget
- 创建StatefulSets
具体配置
- 配置文件
apiVersion: v1 kind: Service metadata: name: zk-hs namespace: prod 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 namespace: prod labels: app: zk spec: ports: - port: 2181 name: client selector: app: zk --- apiVersion: policy/v1beta1 kind: PodDisruptionBudget metadata: name: zk-pdb namespace: prod spec: selector: matchLabels: app: zk maxUnavailable: 1 --- apiVersion: apps/v1 kind: StatefulSet metadata: name: prod-zk namespace: prod spec: selector: matchLabels: app: zk serviceName: zk-hs replicas: 3 updateStrategy: type: RollingUpdate podManagementPolicy: OrderedReady template: metadata: labels: app: zk spec: tolerations: - operator: Exists affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/resource operator: In values: - prod-data podAntiAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchExpressions: - key: "app" operator: In values: - zk topologyKey: "kubernetes.io/hostname" containers: - name: prod-zk imagePullPolicy: Always image: "k8s.gcr.io/kubernetes-zookeeper:1.0-3.4.10" resources: requests: memory: "1Gi" cpu: "0.5" limits: cpu: "1" memory: "2Gi" 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 # 如果是简单的测试sattefulSet安装zookeeper集群,使用临时存储即可 # StatefulSet 控制器为 StatefulSet 中的每个 Pod 生成一个 PersistentVolumeClaim #volumes: #- name: datadir # emptyDir: {} securityContext: runAsUser: 1000 fsGroup: 1000 # 正式环境,需要部署持久化存储 volumeClaimTemplates: - metadata: name: datadir annotations: volume.alpha.kubernetes.io/storage-class: anything spec: accessModes: [ "ReadWriteOnce" ] resources: requests: storage: 20Gi storageClassName: alicloud-disk-essd
- 修改时区(lens编辑)
# 时区调整 volumeMounts: ... - name: localtime mountPath: /etc/localtime --------------------------------------------------- volumes: - name: localtime hostPath: path: /etc/localtime type: ''