Kubernetes使用StatefulSet部署MySQL高可用集群

MySQL简介

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MySQL是一个关系型数据库管理系统，由瑞典MySQL AB公司开发，属于 Oracle 旗下产品。MySQL 是最流行的关系型数据库管理系统之一，在 WEB 应用方面，MySQL是好的 RDBMS (Relational Database Management System，关系数据库管理系统) 应用软件之一。MySQL是一种关系型数据库管理系统，关系数据库将数据保存在不同的表中，而不是将所有数据放在一个大仓库内，这样就增加了速度并提高了灵活性。MySQL所使用的 SQL 语言是用于访问数据库的最常用标准化语言。MySQL 软件采用了双授权政策，分为社区版和商业版，由于其体积小、速度快、总体拥有成本低，尤其是开放源码这一特点，一般中小型网站的开发都选择 MySQL 作为网站数据库。

MySQL高可用方案

下文介绍的MySQL高可用方案采用“主从复制+读写分离”，即由单一的master和多个slave所构成。其中，客户端通过master对数据库进行写操作，什么叫软文营销？通过slave端进行读操作。master出现问题后，可以将应用切换到slave端。此方案是MySQL官方提供的一种高可用解决方案，节点间的数据同步采用MySQL Replication技术。MySQL Replication从一个MySQL数据库服务器（master）的数据复制到一个或多个MySQL数据库服务器（slave）。在默认情况下，复制是异步的；slave不需要一直接收来自主机的更新。根据配置，可以复制数据库中的所有数据库、选定的数据库，或者特定的表。

预配置storageclass，实现nfs做存储类的动态供给pv

1、安装NFS服务器

#安装NFS服务端，选择k8s集群的master1节点（192.168.56.10）[root@k8s-master01 ~]# yum install nfs-utils -y （在所有节点安装nfs-utils,并在node节点测试挂载）[root@k8s-master01 ~]# systemctl start nfs[root@k8s-master01 ~]# systemctl enable nfs#在master1上创建nfs共享目录[root@k8s-master01 ~]# mkdir -p /data/v1[root@k8s-master01 ~]# chown -R 1000:1000 /data/v1[root@k8s-master01 ~]# vim /etc/exports/data/v1 192.168.56.0/24(rw,no_root_squash)[root@k8s-master01 ~]# exportfs -arv 使配置文件生效[root@k8s-master01 ~]# systemctl restart nfs[root@k8s-master01 data]# showmount -eExport list for k8s-master01:/data/v1 192.168.56.0/24#在node01和node02节点上安装nfs-utils，并测试挂载[root@k8s-node01 ~]# yum install -y nfs-utils[root@k8s-node02 ~]# yum install -y nfs-utils[root@k8s-node01 ~]# mount -t nfs 192.168.56.10:/data/v1 /mnt[root@k8s-node01 ~]# mount......192.168.56.10:/data/v1 on /mnt type nfs4 (rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.56.11,local_lock=none,addr=192.168.56.10)[root@k8s-node01 ~]# umount /mnt/

2、实现nfs做storageclass存储类的动态供给pv

创建运行nfs-provisioner的sa账号

[root@k8s-master01 ~]# mkdir mysql && cd mysql/[root@k8s-master01 mysql]# vim serviceaccount.yamlapiVersion: v1kind: ServiceAccountmetadata: name: nfs-provisioner通过kubectl更新yaml文件 [root@k8s-master01 mysql]# kubectl apply -f serviceaccount.yamlserviceaccount/nfs-provisioner created[root@k8s-master01 mysql]# kubectl get saNAME SECRETS AGEdefault 1 4d18hnfs-provisioner 1 33s

对nfs-provisioner这个sa账号做rbac授权

[root@k8s-master01 mysql]# vim rbac.yamlkind: ClusterRoleapiVersion: rbac.authorization.k8s.io/v1metadata: name: nfs-provisioner-runnerrules: - apiGroups: [""] resources: ["persistentvolumes"] verbs: ["get", "list", "watch", "create", "delete"] - apiGroups: [""] resources: ["persistentvolumeclaims"] verbs: ["get", "list", "watch", "update"] - apiGroups: ["storage.k8s.io"] resources: ["storageclasses"] verbs: ["get", "list", "watch"] - apiGroups: [""] resources: ["events"] verbs: ["create", "update", "patch"] - apiGroups: [""] resources: ["services", "endpoints"] verbs: ["get"] - apiGroups: ["extensions"] resources: ["podsecuritypolicies"] resourceNames: ["nfs-provisioner"] verbs: ["use"]---kind: ClusterRoleBindingapiVersion: rbac.authorization.k8s.io/v1metadata: name: run-nfs-provisionersubjects: - kind: ServiceAccount name: nfs-provisioner namespace: defaultroleRef: kind: ClusterRole name: nfs-provisioner-runner apiGroup: rbac.authorization.k8s.io---kind: RoleapiVersion: rbac.authorization.k8s.io/v1metadata: name: leader-locking-nfs-provisionerrules: - apiGroups: [""] resources: ["endpoints"] verbs: ["get", "list", "watch", "create", "update", "patch"]---kind: RoleBindingapiVersion: rbac.authorization.k8s.io/v1metadata: name: leader-locking-nfs-provisionersubjects: - kind: ServiceAccount name: nfs-provisioner namespace: defaultroleRef: kind: Role name: leader-locking-nfs-provisioner apiGroup: rbac.authorization.k8s.io通过kubectl更新yaml文件 [root@k8s-master01 mysql]# kubectl apply -f rbac.yamlclusterrole.rbac.authorization.k8s.io/nfs-provisioner-runner createdclusterrolebinding.rbac.authorization.k8s.io/run-nfs-provisioner createdrole.rbac.authorization.k8s.io/leader-locking-nfs-provisioner createdrolebinding.rbac.authorization.k8s.io/leader-locking-nfs-provisioner created[root@k8s-master01 mysql]# kubectl get rolebindingsNAME ROLE AGEleader-locking-nfs-provisioner Role/leader-locking-nfs-provisioner 36s

通过deployment创建pod用来运行nfs-provisioner

[root@k8s-master01 mysql]# vim deployment.yamlkind: DeploymentapiVersion: apps/v1metadata: name: nfs-provisionerspec: selector: matchLabels: app: nfs-provisioner replicas: 1 strategy: type: Recreate template: metadata: labels: app: nfs-provisioner spec: serviceAccount: nfs-provisioner containers: - name: nfs-provisioner image: registry.cn-hangzhou.aliyuncs.com/open-ali/nfs-client-provisioner:latest imagePullPolicy: IfNotPresent volumeMounts: - name: nfs-client-root mountPath: /persistentvolumes env: - name: PROVISIONER_NAME value: example.com/nfs - name: NFS_SERVER value: 192.168.56.10 - name: NFS_PATH value: /data/v1 volumes: - name: nfs-client-root nfs: server: 192.168.56.10 path: /data/v1通过kubectl更新yaml文件 [root@k8s-master01 mysql]# kubectl apply -f deployment.yamldeployment.apps/nfs-provisioner created[root@k8s-master01 mysql]# kubectl get podsNAME READY STATUS RESTARTS AGEnfs-provisioner-6dccbfd48f-p4cc4 1/1 Running 0 19s

注：上面yaml文件说明： - name: PROVISIONER_NAME value: example.com/nfs#PROVISIONER_NAME是example.com/nfs#example.com/nfs需要跟后面的storageclass的provisinoer保持一致 - name: NFS_SERVER value: 192.168.56.10 #这个需要写nfs服务端所在的ip地址，大家需要写自己的nfs地址 - name: NFS_PATH value: /data/v1 #这个是nfs服务端共享的目录 volumes: - name: nfs-client-root nfs: server: 192.168.56.10 #nfs服务端ip path:/data/v1 #nfs服务端共享目录

kubectl describe pod nfs-provisioner-6dccbfd48f-p4cc4 查看pod详情kubectl logs -f nfs-provisioner-6dccbfd48f-p4cc4 查看pod日志、排错

创建storageclass存储类

[root@k8s-master01 mysql]# vim storageclass.yamlapiVersion: storage.k8s.io/v1kind: StorageClassmetadata: name: nfsprovisioner: example.com/nfs注意：provisioner:example.com/nfs #该值需要和provisioner配置的保持一致通过kubectl更新yaml文件[root@k8s-master01 mysql]# kubectl apply -f storageclass.yaml storageclass.storage.k8s.io/nfs created[root@k8s-master01 mysql]# kubectl get scNAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGEnfs example.com/nfs Delete Immediate false 6s

MySQL高可用集群部署

1、创建ConfigMap

通过yaml文件创建名为mysql的ConfigMap

[root@k8s-master01 mysql]# vim mysql-configmap.yamlapiVersion: v1kind: ConfigMapmetadata: name: mysql labels: app: mysqldata: master.cnf: | log-bin log_bin_trust_function_creators=1 lower_case_table_names=1 slave.cnf: | super-read-only log_bin_trust_function_creators=1 通过kubectl更新yaml文件[root@k8s-master01 mysql]# kubectl apply -f mysql-configmap.yaml -n kube-publicconfigmap/mysql created[root@k8s-master01 mysql]# kubectl get configmap -n kube-publicNAME DATA AGEcluster-info 2 4d18hmysql 2 11s

2、创建Services

通过yaml文件创建两个service，分别是 mysql 和 mysql-read

[root@k8s-master01 mysql]# vim mysql-service.yamlapiVersion: v1kind: Servicemetadata: name: mysql labels: app: mysqlspec: ports: - name: mysql port: 3306 clusterIP: None selector: app: mysql---apiVersion: v1kind: Servicemetadata: name: mysql-read labels: app: mysqlspec: ports: - name: mysql port: 3306 selector: app: mysql通过kubectl更新yaml文件[root@k8s-master01 mysql]# kubectl apply -f mysql-service.yaml -n kube-publicservice/mysql createdservice/mysql-read created[root@k8s-master01 mysql]# kubectl get svc -n kube-publicNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEmysql ClusterIP None 3306/TCP 6smysql-read ClusterIP 10.96.89.246 3306/TCP 6s

master、node节点下载测试的image镜像docker pull registry.cn-hangzhou.aliyuncs.com/yangb/mysql5.7:latestdocker pull registry.cn-hangzhou.aliyuncs.com/test_k8s/xtrabackup:1.0docker tag registry.cn-hangzhou.aliyuncs.com/yangb/mysql5.7:latest mysql:5.7docker tag registry.cn-hangzhou.aliyuncs.com/test_k8s/xtrabackup:1.0 gcr.io/google-samples/xtrabackup:1.0

3、创建StatefulSet

通过yaml文件创建名为mysql的StatefulSet

[root@k8s-master01 mysql]# vim mysql-statefulset.yamlapiVersion: apps/v1kind: StatefulSetmetadata: name: mysqlspec: selector: matchLabels: app: mysql serviceName: mysql replicas: 3 volumeClaimTemplates: - metadata: name: data annotations: volume.beta.kubernetes.io/storage-class: "nfs" spec: accessModes: [ "ReadWriteOnce" ] resources: requests: storage: 10Gi template: metadata: labels: app: mysql spec: initContainers: - name: init-mysql image: mysql:5.7 command: - bash - "-c" - | set -ex [[ `hostname` =~ -(+)$ ]] || exit 1 ordinal=${BASH_REMATCH} echo >/mnt/conf.d/server-id.cnf echo server-id=$((100 + $ordinal)) >>/mnt/conf.d/server-id.cnf if [[ $ordinal -eq 0 ]]; then cp /mnt/config-map/master.cnf /mnt/conf.d/ else cp /mnt/config-map/slave.cnf /mnt/conf.d/ fi volumeMounts: - name: conf mountPath: /mnt/conf.d - name: config-map mountPath: /mnt/config-map - name: clone-mysql image: gcr.io/google-samples/xtrabackup:1.0 command: - bash - "-c" - | set -ex [[ -d /var/lib/mysql/mysql ]] && exit 0 [[ `hostname` =~ -(+)$ ]] || exit 1 ordinal=${BASH_REMATCH} [[ $ordinal -eq 0 ]] && exit 0 ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql xtrabackup --prepare --target-dir=/var/lib/mysql volumeMounts: - name: data mountPath: /var/lib/mysql subPath: mysql - name: conf mountPath: /etc/mysql/conf.d containers: - name: mysql image: mysql:5.7 env: - name: MYSQL_ALLOW_EMPTY_PASSWORD value: "1" ports: - name: mysql containerPort: 3306 volumeMounts: - name: data mountPath: /var/lib/mysql subPath: mysql - name: conf mountPath: /etc/mysql/conf.d resources: requests: cpu: 500m memory: 1Gi livenessProbe: exec: command: ["mysqladmin", "ping"] initialDelaySeconds: 30 periodSeconds: 10 timeoutSeconds: 5 readinessProbe: exec: command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"] initialDelaySeconds: 5 periodSeconds: 2 timeoutSeconds: 1 - name: xtrabackup image: gcr.io/google-samples/xtrabackup:1.0 ports: - name: xtrabackup containerPort: 3307 command: - bash - "-c" - | set -ex cd /var/lib/mysql if [[ -f xtrabackup_slave_info ]]; then mv xtrabackup_slave_info change_master_to.sql.in rm -f xtrabackup_binlog_info elif [[ -f xtrabackup_binlog_info ]]; then [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[ ]]+(.*?)$ ]] || exit 1 rm xtrabackup_binlog_info echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH}',\ MASTER_LOG_POS=${BASH_REMATCH}" >change_master_to.sql.in fi if [[ -f change_master_to.sql.in ]]; then echo "Waiting for mysqld to be ready (accepting connections)" until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done echo "Initializing replication from clone position" mv change_master_to.sql.in change_master_to.sql.orig mysql -h 127.0.0.1 <

在启动后，应该能够看到如下的信息：[root@k8s-master01 mysql]# kubectl get pods -lapp=mysql --watch -n kube-publicNAME READY STATUS RESTARTS AGEmysql-0 2/2 Running 0 16mmysql-1 2/2 Running 1 15mmysql-2 2/2 Running 1 15m[root@k8s-master01 mysql]# kubectl get pod -o wide -n kube-publicNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESmysql-0 2/2 Running 0 16m 10.244.2.12 k8s-node02 mysql-1 2/2 Running 1 15m 10.244.1.13 k8s-node01 mysql-2 2/2 Running 1 15m 10.244.1.14 k8s-node01

MySQL部署环境验证

1）通过运行一个临时的容器(使用mysql:5.7镜像)，使用 MySQL 客户端发送测试请求给 mysql master 节点（主机名为 mysql-0.mysql；跨命名空间的话，主机名请使用 mysql-0.mysql.kube-public ）

[root@k8s-master01 mysql]# kubectl run mysql-client --image=mysql:5.7 -it --rm --restart=Never -- mysql -h mysql-0.mysql.kube-publicIf you don't see a command prompt, try pressing enter.Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 625Server version: 5.7.16-log MySQL Community Server (GPL)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.在master节点上创建demo数据库，并创建一个只有message字段的demo.messages的表，并为message字段插入hello值。mysql>CREATE DATABASE demo;Query OK, 1 row affected (0.02 sec)mysql>CREATE TABLE demo.messages (message VARCHAR(250));Query OK, 0 rows affected (0.10 sec)mysql>INSERT INTO demo.messages VALUES ('hello');Query OK, 1 row affected (0.02 sec)

2）使用主机名为mysql-read来发送测试请求给服务器（另开窗口）

[root@k8s-master01 mysql]# kubectl run mysql-client1 --image=mysql:5.7 -i -t --rm --restart=Never -- mysql -h mysql-read.kube-publicIf you don't see a command prompt, try pressing enter.Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 608Server version: 5.7.16 MySQL Community Server (GPL)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>show databases;+------------------------+| Database |+------------------------+| information_schema || demo || mysql || performance_schema || sys || xtrabackup_backupfiles |+------------------------+6 rows in set (0.02 sec)mysql>select * from demo.messages;+---------+| message |+---------+| hello |+---------+1 row in set (0.00 sec)

滚动更新、扩展伸缩、更新策略、版本升级

RollingUpdate 更新策略在 StatefulSet 中实现 Pod 的自动滚动更新。当StatefulSet的 .spec.updateStrategy.type 设置为 RollingUpdate 时，默认为：RollingUpdate。StatefulSet 控制器将在 StatefulSet 中删除并重新创建每个 Pod。它将以与 Pod 终止相同的顺序进行（从大的序数到最小的序数），每次更新一个 Pod。在更新其前身之前，它将等待正在更新的 Pod 状态变成正在运行并就绪。

如下操作的滚动更新是有 mysql 2-0的顺序更新。

master、node节点下载测试的image镜像docker pull registry.cn-hangzhou.aliyuncs.com/chad/mysql-5.7.19:latestdocker tag registry.cn-hangzhou.aliyuncs.com/chad/mysql-5.7.19:latest mysql:5.7.19修改mysql image版本mysql:5.7.19[root@k8s-master01 mysql]# cp mysql-statefulset.yaml mysql-5.7.19-statefulset.yaml[root@k8s-master01 mysql]# vim mysql-5.7.19-statefulset.yamlo-v2.yaml..... image: mysql:5.7.19 image: mysql:5.7.19....通过kubectl更新yaml文件[root@k8s-master01 mysql]# kubectl apply -f mysql-5.7.19-statefulset.yaml -n kube-publicstatefulset.apps/mysql configured查看滚动更新的过程[root@k8s-master01 ~]# kubectl get pods -w -n kube-publicNAME READY STATUS RESTARTS AGEmysql-0 2/2 Running 0 64mmysql-1 2/2 Running 1 64mmysql-2 2/2 Running 1 63mmysql-2 2/2 Terminating 1 63mmysql-2 0/2 Terminating 1 64mmysql-2 0/2 Terminating 1 64mmysql-2 0/2 Terminating 1 64mmysql-2 0/2 Pending 0 0smysql-2 0/2 Pending 0 0smysql-2 0/2 Init:0/2 0 0smysql-2 0/2 Init:0/2 0 1smysql-2 0/2 Init:1/2 0 3smysql-2 0/2 PodInitializing 0 4smysql-2 1/2 Running 0 5smysql-2 2/2 Running 0 9smysql-1 2/2 Terminating 1 65mmysql-1 0/2 Terminating 1 65mmysql-1 0/2 Terminating 1 65mmysql-1 0/2 Terminating 1 65mmysql-1 0/2 Pending 0 0smysql-1 0/2 Pending 0 0smysql-1 0/2 Init:0/2 0 0smysql-1 0/2 Init:0/2 0 1smysql-1 0/2 Init:1/2 0 2smysql-1 0/2 PodInitializing 0 3smysql-1 1/2 Running 0 6smysql-1 2/2 Running 0 11smysql-0 2/2 Terminating 0 66mmysql-0 1/2 Terminating 0 66mmysql-0 0/2 Terminating 0 66mmysql-0 0/2 Terminating 0 67mmysql-0 0/2 Terminating 0 67mmysql-0 0/2 Pending 0 0smysql-0 0/2 Pending 0 0smysql-0 0/2 Init:0/2 0 0smysql-0 0/2 Init:0/2 0 1smysql-0 0/2 Init:1/2 0 3smysql-0 0/2 PodInitializing 0 7smysql-0 1/2 Running 0 9smysql-0 2/2 Running 0 13s

[root@k8s-master01 mysql]# kubectl get sts -o wide -n kube-public NAME READY AGE CONTAINERS IMAGESmysql 3/3 77m mysql,xtrabackup mysql:5.7.19,gcr.io/google-samples/xtrabackup:1.0扩容方法1：命令行，进行扩容[root@k8s-master01 mysql]# kubectl scale sts mysql --replicas=4 -n kube-publicstatefulset.apps/mysql scaled方法2：声明式命令方式，直接修改stateful-demo-v2.yaml文件，进行扩容（推荐）[root@k8s-master01 mysql]# vim mysql-5.7.19-statefulset.yaml修改.spec.replicas的值spec: replicas: 4 [root@k8s-master01 mysql]# kubectl apply -f mysql-5.7.19-statefulset.yaml 方法3：补丁式命令方式，直接编辑运行中sts，进行扩容[root@k8s-master01 mysql]# kubectl edit sts mysql -n kube-public修改.spec.replicas的值spec: replicas: 4 方法4：补丁式命令方式，通过打补丁的方式，进行扩容[root@k8s-master01 mysql]# kubectl patch sts mysql -p '{"spec":{"replicas":4}}' -n kube-public 查看mysql pod动态扩容[root@k8s-master01 ~]# kubectl get pods -w -n kube-publicNAME READY STATUS RESTARTS AGEmysql-0 2/2 Running 0 16mmysql-1 2/2 Running 0 17mmysql-2 2/2 Running 0 17mmysql-3 0/2 Pending 0 0smysql-3 0/2 Pending 0 0smysql-3 0/2 Pending 0 2smysql-3 0/2 Init:0/2 0 2smysql-3 0/2 Init:0/2 0 4smysql-3 0/2 Init:1/2 0 5smysql-3 0/2 Init:1/2 0 6smysql-3 0/2 PodInitializing 0 27smysql-3 1/2 Error 0 28smysql-3 1/2 Running 1 29smysql-3 2/2 Running 1 34s查看mysql pod信息[root@k8s-master01 mysql]# kubectl get pod -n kube-public NAME READY STATUS RESTARTS AGEmysql-0 2/2 Running 0 16mmysql-1 2/2 Running 0 17mmysql-2 2/2 Running 0 17mmyapp-3 1/1 Running 0 102s查看pvc[root@k8s-master01 mysql]# kubectl get pvc -n kube-publicNAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGEdata-mysql-0 Bound pvc-fba11f83-cf29-4b76-b66a-3a58f91738a9 10Gi RWO nfs 93mdata-mysql-1 Bound pvc-6c434fb2-1076-4912-80fb-eee6c0e3b957 10Gi RWO nfs 93mdata-mysql-2 Bound pvc-d33d34dd-a80f-41bd-82d0-58f7126fed13 10Gi RWO nfs 92mdata-mysql-3 Bound pvc-202370f2-a2aa-456c-8cb0-81686a4ea39e 10Gi RWO nfs 11m查看pv[root@k8s-master01 mysql]# kubectl get pvNAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGEpvc-202370f2-a2aa-456c-8cb0-81686a4ea39e 10Gi RWO Delete Bound kube-public/data-mysql-3 nfs 11mpvc-6c434fb2-1076-4912-80fb-eee6c0e3b957 10Gi RWO Delete Bound kube-public/data-mysql-1 nfs 92mpvc-d33d34dd-a80f-41bd-82d0-58f7126fed13 10Gi RWO Delete Bound kube-public/data-mysql-2 nfs 92mpvc-fba11f83-cf29-4b76-b66a-3a58f91738a9 10Gi RWO Delete Bound kube-public/data-mysql-0 nfs 93m缩容方法1：命令行，进行缩容[root@k8s-master01 mysql]# kubectl scale sts mysql --replicas=3 -n kube-publicstatefulset.apps/mysql scaled查看mysql pod动态缩容[root@k8s-master01 ~]# kubectl get pods -w -n kube-publicNAME READY STATUS RESTARTS AGEmysql-0 2/2 Running 0 31mmysql-1 2/2 Running 0 32mmysql-2 2/2 Running 0 32mmysql-3 2/2 Running 1 16mmysql-3 2/2 Terminating 1 16mmysql-3 0/2 Terminating 1 16mmysql-3 0/2 Terminating 1 16mmysql-3 0/2 Terminating 1 16m查看mysql pod信息[root@k8s-master01 mysql]# kubectl get pod -n kube-publicNAME READY STATUS RESTARTS AGEmysql-0 2/2 Running 0 33mmysql-1 2/2 Running 0 34mmysql-2 2/2 Running 0 34m查看pvc （pod删除，pv和pvc 关联还在，方便后续动态扩容，自动挂载原pvc和pv）[root@k8s-master01 mysql]# kubectl get pvc -n kube-publicNAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGEdata-mysql-0 Bound pvc-fba11f83-cf29-4b76-b66a-3a58f91738a9 10Gi RWO nfs 100mdata-mysql-1 Bound pvc-6c434fb2-1076-4912-80fb-eee6c0e3b957 10Gi RWO nfs 100mdata-mysql-2 Bound pvc-d33d34dd-a80f-41bd-82d0-58f7126fed13 10Gi RWO nfs 99mdata-mysql-3 Bound pvc-202370f2-a2aa-456c-8cb0-81686a4ea39e 10Gi RWO nfs 18m查看pv （pod删除，pv和pvc 关联还在，方便后续动态扩容，自动挂载原pvc和pv）[root@k8s-master01 mysql]# kubectl get pvNAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGEpvc-202370f2-a2aa-456c-8cb0-81686a4ea39e 10Gi RWO Delete Bound kube-public/data-mysql-3 nfs 18mpvc-6c434fb2-1076-4912-80fb-eee6c0e3b957 10Gi RWO Delete Bound kube-public/data-mysql-1 nfs 100mpvc-d33d34dd-a80f-41bd-82d0-58f7126fed13 10Gi RWO Delete Bound kube-public/data-mysql-2 nfs 99mpvc-fba11f83-cf29-4b76-b66a-3a58f91738a9 10Gi RWO Delete Bound kube-public/data-mysql-0 nfs 100m查看nfs存储目录/data/v1 (pod删除，数据还在)[root@k8s-master01 mysql]# ll /data/v1/total 0drwxrwxrwx 3 root root 19 Jul 8 11:00 kube-public-data-mysql-0-pvc-fba11f83-cf29-4b76-b66a-3a58f91738a9drwxrwxrwx 3 root root 19 Jul 8 11:00 kube-public-data-mysql-1-pvc-6c434fb2-1076-4912-80fb-eee6c0e3b957drwxrwxrwx 3 root root 19 Jul 8 11:01 kube-public-data-mysql-2-pvc-d33d34dd-a80f-41bd-82d0-58f7126fed13drwxrwxrwx 3 root root 19 Jul 8 12:22 kube-public-data-mysql-3-pvc-202370f2-a2aa-456c-8cb0-81686a4ea39e

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本文名称：Kubernetes使用StatefulSet部署MySQL高可用集群
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