Pod调度运⾏时，如果应⽤不需要任何稳定的标示、有序的部署、删除和扩展，则应该使⽤⼀组⽆状态副本的控制器来部署应⽤，例如 Deployment 或 ReplicaSet更适合⽆状态服务需求，⽽StatefulSet适合管理所有有状态的服务，⽐如MySQL、MongoDB集群等。

StatefulSet本质上是Deployment的⼀种变体，在v1.9版本中已成为GA版本，它为了解决有状态服务的问题，它所管理的Pod拥有固定的Pod名称，启停顺序，在StatefulSet中，Pod名字称为⽹络标识(hostname)，还必须要⽤到共享存储。在Deployment中，与之对应的服务是service，⽽在StatefulSet中与之对应的headless service，headless service，即⽆头服务，与service的区别就是它没有Cluster IP，解析它的名称时将返回该Headless Service对应的全部Pod的Endpoint列表。

下载镜像

【资料图】

root@k8s-master01:~# nerdctl pull mysql:5.7.36

修改镜像tag为本地harbor地址

root@k8s-master01:~# nerdctl tag mysql:5.7.36 harbor.ik8s.cc/magedu/mysql:5.7.36

上传镜像至本地harbor

root@k8s-master01:~# nerdctl push harbor.ik8s.cc/magedu/mysql:5.7.36

下载镜像

root@k8s-master01:~# nerdctl pull registry.cn-hangzhou.aliyuncs.com/hxpdocker/xtrabackup:1.0

修改镜像tag为本地harbor地址

root@k8s-master01:~# nerdctl tag registry.cn-hangzhou.aliyuncs.com/hxpdocker/xtrabackup:1.0 harbor.ik8s.cc/magedu/xtrabackup:1.0

上传镜像至本地harbor

root@k8s-master01:~# nerdctl push harbor.ik8s.cc/magedu/xtrabackup:1.0

root@harbor:~# mkdir -pv /data/k8sdata/magedu/mysql-datadir-{1..5}mkdir: created directory "/data/k8sdata/magedu/mysql-datadir-1"mkdir: created directory "/data/k8sdata/magedu/mysql-datadir-2"mkdir: created directory "/data/k8sdata/magedu/mysql-datadir-3"mkdir: created directory "/data/k8sdata/magedu/mysql-datadir-4"mkdir: created directory "/data/k8sdata/magedu/mysql-datadir-5"root@harbor:~# 

root@harbor:/data/k8sdata/magedu# cat /etc/exports # /etc/exports: the access control list for filesystems which may be exported#               to NFS clients.  See exports(5).## Example for NFSv2 and NFSv3:# /srv/homes       hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)## Example for NFSv4:# /srv/nfs4        gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)# /srv/nfs4/homes  gss/krb5i(rw,sync,no_subtree_check)#/data/k8sdata/kuboard *(rw,no_root_squash)/data/volumes *(rw,no_root_squash)/pod-vol *(rw,no_root_squash)/data/k8sdata/myserver *(rw,no_root_squash)/data/k8sdata/mysite *(rw,no_root_squash)/data/k8sdata/magedu/images *(rw,no_root_squash)/data/k8sdata/magedu/static *(rw,no_root_squash)/data/k8sdata/magedu/zookeeper-datadir-1 *(rw,no_root_squash)/data/k8sdata/magedu/zookeeper-datadir-2 *(rw,no_root_squash)/data/k8sdata/magedu/zookeeper-datadir-3 *(rw,no_root_squash)/data/k8sdata/magedu/redis-datadir-1 *(rw,no_root_squash) /data/k8sdata/magedu/redis0 *(rw,no_root_squash)/data/k8sdata/magedu/redis1 *(rw,no_root_squash)/data/k8sdata/magedu/redis2 *(rw,no_root_squash)/data/k8sdata/magedu/redis3 *(rw,no_root_squash)/data/k8sdata/magedu/redis4 *(rw,no_root_squash)/data/k8sdata/magedu/redis5 *(rw,no_root_squash)/data/k8sdata/magedu/mysql-datadir-1 *(rw,no_root_squash)/data/k8sdata/magedu/mysql-datadir-2 *(rw,no_root_squash)/data/k8sdata/magedu/mysql-datadir-3 *(rw,no_root_squash)/data/k8sdata/magedu/mysql-datadir-4 *(rw,no_root_squash)/data/k8sdata/magedu/mysql-datadir-5 *(rw,no_root_squash)root@harbor:/data/k8sdata/magedu# exportfs -avexportfs: /etc/exports [1]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/kuboard".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [2]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/volumes".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [3]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/pod-vol".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [4]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/myserver".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [5]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/mysite".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [7]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/images".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [8]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/static".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [11]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-1".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [12]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-2".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [13]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-3".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [16]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis-datadir-1".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [18]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis0".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [19]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis1".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [20]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis2".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [21]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis3".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [22]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis4".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [23]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/redis5".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [27]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/mysql-datadir-1".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [28]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/mysql-datadir-2".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [29]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/mysql-datadir-3".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [30]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/mysql-datadir-4".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexportfs: /etc/exports [31]: Neither "subtree_check" or "no_subtree_check" specified for export "*:/data/k8sdata/magedu/mysql-datadir-5".  Assuming default behaviour ("no_subtree_check").  NOTE: this default has changed since nfs-utils version 1.0.xexporting *:/data/k8sdata/magedu/mysql-datadir-5exporting *:/data/k8sdata/magedu/mysql-datadir-4exporting *:/data/k8sdata/magedu/mysql-datadir-3exporting *:/data/k8sdata/magedu/mysql-datadir-2exporting *:/data/k8sdata/magedu/mysql-datadir-1exporting *:/data/k8sdata/magedu/redis5exporting *:/data/k8sdata/magedu/redis4exporting *:/data/k8sdata/magedu/redis3exporting *:/data/k8sdata/magedu/redis2exporting *:/data/k8sdata/magedu/redis1exporting *:/data/k8sdata/magedu/redis0exporting *:/data/k8sdata/magedu/redis-datadir-1exporting *:/data/k8sdata/magedu/zookeeper-datadir-3exporting *:/data/k8sdata/magedu/zookeeper-datadir-2exporting *:/data/k8sdata/magedu/zookeeper-datadir-1exporting *:/data/k8sdata/magedu/staticexporting *:/data/k8sdata/magedu/imagesexporting *:/data/k8sdata/mysiteexporting *:/data/k8sdata/myserverexporting *:/pod-volexporting *:/data/volumesexporting *:/data/k8sdata/kuboardroot@harbor:/data/k8sdata/magedu# 

创建pv配置清单

---apiVersion: v1kind: PersistentVolumemetadata:  name: mysql-datadir-1  namespace: mageduspec:  capacity:    storage: 50Gi  accessModes:    - ReadWriteOnce  nfs:    path: /data/k8sdata/magedu/mysql-datadir-1     server: 192.168.0.42---apiVersion: v1kind: PersistentVolumemetadata:  name: mysql-datadir-2  namespace: mageduspec:  capacity:    storage: 50Gi  accessModes:    - ReadWriteOnce  nfs:    path: /data/k8sdata/magedu/mysql-datadir-2    server: 192.168.0.42---apiVersion: v1kind: PersistentVolumemetadata:  name: mysql-datadir-3  namespace: mageduspec:  capacity:    storage: 50Gi  accessModes:    - ReadWriteOnce  nfs:    path: /data/k8sdata/magedu/mysql-datadir-3    server: 192.168.0.42---apiVersion: v1kind: PersistentVolumemetadata:  name: mysql-datadir-4  namespace: mageduspec:  capacity:    storage: 50Gi  accessModes:    - ReadWriteOnce  nfs:    path: /data/k8sdata/magedu/mysql-datadir-4    server: 192.168.0.42---apiVersion: v1kind: PersistentVolumemetadata:  name: mysql-datadir-5  namespace: mageduspec:  capacity:    storage: 50Gi  accessModes:    - ReadWriteOnce  nfs:    path: /data/k8sdata/magedu/mysql-datadir-5    server: 192.168.0.42

创建pv

root@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl apply -f pv/mysql-persistentvolume.yamlpersistentvolume/mysql-datadir-1 createdpersistentvolume/mysql-datadir-2 createdpersistentvolume/mysql-datadir-3 createdpersistentvolume/mysql-datadir-4 createdpersistentvolume/mysql-datadir-5 createdroot@k8s-master01:~/k8s-data/yaml/magedu/mysql#

root@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl get pvNAME                     CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                            STORAGECLASS   REASON   AGEmysql-datadir-1          50Gi       RWO            Retain           Available                                                            5smysql-datadir-2          50Gi       RWO            Retain           Available                                                            5smysql-datadir-3          50Gi       RWO            Retain           Available                                                            5smysql-datadir-4          50Gi       RWO            Retain           Available                                                            5smysql-datadir-5          50Gi       RWO            Retain           Available                                                            5sredis-cluster-pv0        5Gi        RWO            Retain           Bound       magedu/data-redis-1                                      8dredis-cluster-pv1        5Gi        RWO            Retain           Bound       magedu/data-redis-3                                      8dredis-cluster-pv2        5Gi        RWO            Retain           Bound       magedu/data-redis-4                                      8dredis-cluster-pv3        5Gi        RWO            Retain           Bound       magedu/data-redis-0                                      8dredis-cluster-pv4        5Gi        RWO            Retain           Bound       magedu/data-redis-5                                      8dredis-cluster-pv5        5Gi        RWO            Retain           Bound       magedu/data-redis-2                                      8dredis-datadir-pv-1       10Gi       RWO            Retain           Bound       magedu/redis-datadir-pvc-1                               9dzookeeper-datadir-pv-1   20Gi       RWO            Retain           Bound       magedu/zookeeper-datadir-pvc-1                           10dzookeeper-datadir-pv-2   20Gi       RWO            Retain           Bound       magedu/zookeeper-datadir-pvc-2                           10dzookeeper-datadir-pv-3   20Gi       RWO            Retain           Bound       magedu/zookeeper-datadir-pvc-3                           10droot@k8s-master01:~/k8s-data/yaml/magedu/mysql# 

MYSQL CONFIGMAP配置清单

apiVersion: v1kind: ConfigMapmetadata:  name: mysql  namespace: magedu  labels:    app: mysqldata:  master.cnf: |    # Apply this config only on the master.    [mysqld]    log-bin    log_bin_trust_function_creators=1    lower_case_table_names=1  slave.cnf: |    # Apply this config only on slaves.    [mysqld]    super-read-only    log_bin_trust_function_creators=1

MYSQL POD配置清单

apiVersion: apps/v1kind: StatefulSetmetadata:  name: mysql  namespace: mageduspec:  selector:    matchLabels:      app: mysql  serviceName: mysql  replicas: 2  template:    metadata:      labels:        app: mysql    spec:      initContainers:      - name: init-mysql #初始化容器1、基于当前pod name匹配角色是master还是slave，并动态生成相对应的配置文件        image: harbor.ik8s.cc/magedu/mysql:5.7.36        command:        - bash        - "-c"        - |          set -ex          # Generate mysql server-id from pod ordinal index.          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1 #匹配hostname的最后一位、最后是一个顺序叠加的整数          ordinal=${BASH_REMATCH[1]}           echo [mysqld] > /mnt/conf.d/server-id.cnf          # Add an offset to avoid reserved server-id=0 value.          echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf          # Copy appropriate conf.d files from config-map to emptyDir.          if [[ $ordinal -eq 0 ]]; then #如果是master、则cpmaster配置文件            cp /mnt/config-map/master.cnf /mnt/conf.d/          else #否则cp slave配置文件            cp /mnt/config-map/slave.cnf /mnt/conf.d/          fi        volumeMounts:        - name: conf #临时卷、emptyDir          mountPath: /mnt/conf.d        - name: config-map          mountPath: /mnt/config-map      - name: clone-mysql #初始化容器2、用于生成mysql配置文件、并从上一个pod完成首次的全量数据clone(slave 3从slave2 clone，而不是每个slave都从master clone实现首次全量同步,但是后期都是与master实现增量同步)        image: harbor.ik8s.cc/magedu/xtrabackup:1.0         command:        - bash        - "-c"        - |          set -ex          # Skip the clone if data already exists.          [[ -d /var/lib/mysql/mysql ]] && exit 0          # Skip the clone on master (ordinal index 0).          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1          ordinal=${BASH_REMATCH[1]}          [[ $ordinal -eq 0 ]] && exit 0 #如果最后一位是0(master)则退出clone过程          # Clone data from previous peer.          ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql #从上一个pod执行clone(binlog),xbstream为解压缩命令          # Prepare the backup.xue          xtrabackup --prepare --target-dir=/var/lib/mysql #通过xtrabackup恢复binlog        volumeMounts:        - name: data          mountPath: /var/lib/mysql          subPath: mysql        - name: conf          mountPath: /etc/mysql/conf.d      containers:      - name: mysql #业务容器1(mysql主容器)        image: harbor.ik8s.cc/magedu/mysql:5.7.36        env:        - name: MYSQL_ALLOW_EMPTY_PASSWORD          value: "1"        ports:        - name: mysql          containerPort: 3306        volumeMounts:        - name: data #挂载数据目录至/var/lib/mysql          mountPath: /var/lib/mysql          subPath: mysql        - name: conf #配置文件/etc/mysql/conf.d          mountPath: /etc/mysql/conf.d        resources: #资源限制          requests:            cpu: 500m            memory: 1Gi        livenessProbe: #存活探针          exec:            command: ["mysqladmin", "ping"]          initialDelaySeconds: 30          periodSeconds: 10          timeoutSeconds: 5        readinessProbe: #就绪探针          exec:            # Check we can execute queries over TCP (skip-networking is off).            command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]          initialDelaySeconds: 5          periodSeconds: 2          timeoutSeconds: 1      - name: xtrabackup #业务容器2(xtrabackup),用于后期同步master 的binglog并恢复数据        image: harbor.ik8s.cc/magedu/xtrabackup:1.0         ports:        - name: xtrabackup          containerPort: 3307        command:        - bash        - "-c"        - |          set -ex          cd /var/lib/mysql          # Determine binlog position of cloned data, if any.          if [[ -f xtrabackup_slave_info ]]; then            # XtraBackup already generated a partial "CHANGE MASTER TO" query            # because we"re cloning from an existing slave.            mv xtrabackup_slave_info change_master_to.sql.in            # Ignore xtrabackup_binlog_info in this case (it"s useless).            rm -f xtrabackup_binlog_info          elif [[ -f xtrabackup_binlog_info ]]; then            # We"re cloning directly from master. Parse binlog position.            [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1            rm xtrabackup_binlog_info            echo "CHANGE MASTER TO MASTER_LOG_FILE="${BASH_REMATCH[1]}",\                  MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in #生成CHANGE MASTER命令          fi          # Check if we need to complete a clone by starting replication.          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"            # In case of container restart, attempt this at-most-once.            mv change_master_to.sql.in change_master_to.sql.orig             #执行CHANGE MASTER操作并启动SLAVE            mysql -h 127.0.0.1 <

上述配置清单主要定义两个mysqlPod，其中每个pod中运行4个容器，第一个容器init容器主要目的是通过sts控制器创建pod的名称id来确定挂载master和slave配置；第二个初始化容器主要目的是用于克隆上一个pod的数据，即salve1从master上克隆数据，slave2从slave1克隆数据，以此类推；第三个就是mysql主容器，运行mysql实例；第四个容器主要用于给mysql主容器同步后期的增量数据的；

MYSQL SERVICE配置清单

# Headless service for stable DNS entries of StatefulSet members.apiVersion: v1kind: Servicemetadata:  namespace: magedu  name: mysql  labels:    app: mysqlspec:  ports:  - name: mysql    port: 3306  clusterIP: None  selector:    app: mysql---# Client service for connecting to any MySQL instance for reads.# For writes, you must instead connect to the master: mysql-0.mysql.apiVersion: v1kind: Servicemetadata:  name: mysql-read  namespace: magedu  labels:    app: mysqlspec:  ports:  - name: mysql    port: 3306  selector:    app: mysql

上述配置清单主要创建了两个service，第一个是一个无头service 用户返回后端所有pod端点；第二个service是一个默认clusterip类型service，这两个service都是可以的；

root@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl apply -f mysql-configmap.yaml -f mysql-services.yaml -f mysql-statefulset.yaml configmap/mysql createdservice/mysql createdservice/mysql-read createdstatefulset.apps/mysql createdroot@k8s-master01:~/k8s-data/yaml/magedu/mysql# 

root@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl get pods -n magedu NAME                                             READY   STATUS      RESTARTS       AGEmagedu-nginx-deployment-5589bbf4bc-6gd2w         1/1     Running     8 (113m ago)   11dmagedu-tomcat-app1-deployment-7754c8549c-c7rtb   1/1     Running     4 (114m ago)   11dmagedu-tomcat-app1-deployment-7754c8549c-prglk   1/1     Running     4 (114m ago)   11dmysql-0                                          2/2     Running     0              47smysql-1                                          2/2     Running     0              23sredis-0                                          1/1     Running     2 (114m ago)   8dredis-1                                          1/1     Running     2 (114m ago)   8dredis-2                                          1/1     Running     2 (114m ago)   8dredis-3                                          1/1     Running     2 (114m ago)   8dredis-4                                          1/1     Running     2 (114m ago)   8dredis-5                                          1/1     Running     2 (114m ago)   8dubuntu1804                                       0/1     Completed   0              8dzookeeper1-675c5477cb-vmwwq                      1/1     Running     4 (114m ago)   10dzookeeper2-759fb6c6f-7jktr                       1/1     Running     4 (114m ago)   10dzookeeper3-5c78bb5974-vxpbh                      1/1     Running     4 (114m ago)   10droot@k8s-master01:~/k8s-data/yaml/magedu/mysql# 

root@k8s-master01:~# kubectl exec -it mysql-0 -n magedu  bash kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.Defaulted container "mysql" out of: mysql, xtrabackup, init-mysql (init), clone-mysql (init)root@mysql-0:/# mysql Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 691Server version: 5.7.36-log MySQL Community Server (GPL)Copyright (c) 2000, 2021, Oracle and/or its affiliates.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 master status\G*************************** 1. row ***************************             File: mysql-0-bin.000003         Position: 313     Binlog_Do_DB:  Binlog_Ignore_DB: Executed_Gtid_Set: 1 row in set (0.01 sec)mysql> exitByeroot@mysql-0:/# exitexitroot@k8s-master01:~# 

root@k8s-master01:~# kubectl exec -it mysql-1 -n magedu  bash  kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.Defaulted container "mysql" out of: mysql, xtrabackup, init-mysql (init), clone-mysql (init)root@mysql-1:/# mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 708Server version: 5.7.36 MySQL Community Server (GPL)Copyright (c) 2000, 2021, Oracle and/or its affiliates.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 slave status\G*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: mysql-0.mysql                  Master_User: root                  Master_Port: 3306                Connect_Retry: 10              Master_Log_File: mysql-0-bin.000003          Read_Master_Log_Pos: 313               Relay_Log_File: mysql-1-relay-bin.000002                Relay_Log_Pos: 481        Relay_Master_Log_File: mysql-0-bin.000003             Slave_IO_Running: Yes            Slave_SQL_Running: Yes              Replicate_Do_DB:           Replicate_Ignore_DB:            Replicate_Do_Table:        Replicate_Ignore_Table:       Replicate_Wild_Do_Table:   Replicate_Wild_Ignore_Table:                    Last_Errno: 0                   Last_Error:                  Skip_Counter: 0          Exec_Master_Log_Pos: 313              Relay_Log_Space: 690              Until_Condition: None               Until_Log_File:                 Until_Log_Pos: 0           Master_SSL_Allowed: No           Master_SSL_CA_File:            Master_SSL_CA_Path:               Master_SSL_Cert:             Master_SSL_Cipher:                Master_SSL_Key:         Seconds_Behind_Master: 0Master_SSL_Verify_Server_Cert: No                Last_IO_Errno: 0                Last_IO_Error:                Last_SQL_Errno: 0               Last_SQL_Error:   Replicate_Ignore_Server_Ids:              Master_Server_Id: 100                  Master_UUID: 72724f41-0b65-11ee-b561-16065cd6961a             Master_Info_File: /var/lib/mysql/master.info                    SQL_Delay: 0          SQL_Remaining_Delay: NULL      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates           Master_Retry_Count: 86400                  Master_Bind:       Last_IO_Error_Timestamp:      Last_SQL_Error_Timestamp:                Master_SSL_Crl:            Master_SSL_Crlpath:            Retrieved_Gtid_Set:             Executed_Gtid_Set:                 Auto_Position: 0         Replicate_Rewrite_DB:                  Channel_Name:            Master_TLS_Version: 1 row in set (0.00 sec)mysql> exit Byeroot@mysql-1:/# exitexitroot@k8s-master01:~# kubectl exec -it mysql-2 -n magedu  bash  kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.Defaulted container "mysql" out of: mysql, xtrabackup, init-mysql (init), clone-mysql (init)root@mysql-2:/# mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 632Server version: 5.7.36 MySQL Community Server (GPL)Copyright (c) 2000, 2021, Oracle and/or its affiliates.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 slave status\G*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: mysql-0.mysql                  Master_User: root                  Master_Port: 3306                Connect_Retry: 10              Master_Log_File: mysql-0-bin.000003          Read_Master_Log_Pos: 313               Relay_Log_File: mysql-2-relay-bin.000002                Relay_Log_Pos: 481        Relay_Master_Log_File: mysql-0-bin.000003             Slave_IO_Running: Yes            Slave_SQL_Running: Yes              Replicate_Do_DB:           Replicate_Ignore_DB:            Replicate_Do_Table:        Replicate_Ignore_Table:       Replicate_Wild_Do_Table:   Replicate_Wild_Ignore_Table:                    Last_Errno: 0                   Last_Error:                  Skip_Counter: 0          Exec_Master_Log_Pos: 313              Relay_Log_Space: 690              Until_Condition: None               Until_Log_File:                 Until_Log_Pos: 0           Master_SSL_Allowed: No           Master_SSL_CA_File:            Master_SSL_CA_Path:               Master_SSL_Cert:             Master_SSL_Cipher:                Master_SSL_Key:         Seconds_Behind_Master: 0Master_SSL_Verify_Server_Cert: No                Last_IO_Errno: 0                Last_IO_Error:                Last_SQL_Errno: 0               Last_SQL_Error:   Replicate_Ignore_Server_Ids:              Master_Server_Id: 100                  Master_UUID: 72724f41-0b65-11ee-b561-16065cd6961a             Master_Info_File: /var/lib/mysql/master.info                    SQL_Delay: 0          SQL_Remaining_Delay: NULL      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates           Master_Retry_Count: 86400                  Master_Bind:       Last_IO_Error_Timestamp:      Last_SQL_Error_Timestamp:                Master_SSL_Crl:            Master_SSL_Crlpath:            Retrieved_Gtid_Set:             Executed_Gtid_Set:                 Auto_Position: 0         Replicate_Rewrite_DB:                  Channel_Name:            Master_TLS_Version: 1 row in set (0.00 sec)mysql> exitByeroot@mysql-2:/# exitexitroot@k8s-master01:~#

root@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl exec -it mysql-0 -n magedu  bashkubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.Defaulted container "mysql" out of: mysql, xtrabackup, init-mysql (init), clone-mysql (init)root@mysql-0:/# mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 355Server version: 5.7.36-log MySQL Community Server (GPL)Copyright (c) 2000, 2021, Oracle and/or its affiliates.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     || mysql                  || performance_schema     || sys                    || xtrabackup_backupfiles |+------------------------+5 rows in set (0.02 sec)mysql> create database mydb;Query OK, 1 row affected (0.00 sec)mysql> show databases;+------------------------+| Database               |+------------------------+| information_schema     || mydb                   || mysql                  || performance_schema     || sys                    || xtrabackup_backupfiles |+------------------------+6 rows in set (0.00 sec)mysql> 

root@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl exec -it mysql-1 -n magedu  bash kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.Defaulted container "mysql" out of: mysql, xtrabackup, init-mysql (init), clone-mysql (init)root@mysql-1:/# mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 437Server version: 5.7.36 MySQL Community Server (GPL)Copyright (c) 2000, 2021, Oracle and/or its affiliates.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     || mydb                   || mysql                  || performance_schema     || sys                    || xtrabackup_backupfiles |+------------------------+6 rows in set (0.01 sec)mysql> exitByeroot@mysql-1:/# exitexitroot@k8s-master01:~/k8s-data/yaml/magedu/mysql# kubectl exec -it mysql-2 -n magedu  bash  kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.Defaulted container "mysql" out of: mysql, xtrabackup, init-mysql (init), clone-mysql (init)root@mysql-2:/# mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 361Server version: 5.7.36 MySQL Community Server (GPL)Copyright (c) 2000, 2021, Oracle and/or its affiliates.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     || mydb                   || mysql                  || performance_schema     || sys                    || xtrabackup_backupfiles |+------------------------+6 rows in set (0.02 sec)mysql> exitByeroot@mysql-2:/# exitexitroot@k8s-master01:~/k8s-data/yaml/magedu/mysql#

root@k8s-master01:~# kubectl get pods -n magedu NAME                                             READY   STATUS      RESTARTS       AGEmagedu-nginx-deployment-5589bbf4bc-6gd2w         1/1     Running     8 (143m ago)   11dmagedu-tomcat-app1-deployment-7754c8549c-c7rtb   1/1     Running     4 (143m ago)   11dmagedu-tomcat-app1-deployment-7754c8549c-prglk   1/1     Running     4 (143m ago)   11dmysql-0                                          2/2     Running     0              3m6smysql-1                                          2/2     Running     0              29mmysql-2                                          2/2     Running     0              27mredis-0                                          1/1     Running     2 (143m ago)   8dredis-1                                          1/1     Running     2 (143m ago)   8dredis-2                                          1/1     Running     2 (143m ago)   8dredis-3                                          1/1     Running     2 (143m ago)   8dredis-4                                          1/1     Running     2 (143m ago)   8dredis-5                                          1/1     Running     2 (143m ago)   8dubuntu1804                                       0/1     Completed   0              8dzookeeper1-675c5477cb-vmwwq                      1/1     Running     4 (143m ago)   10dzookeeper2-759fb6c6f-7jktr                       1/1     Running     4 (143m ago)   10dzookeeper3-5c78bb5974-vxpbh                      1/1     Running     4 (143m ago)   10droot@k8s-master01:~# kubectl delete pods mysql-1 -n magedu pod "mysql-1" deletedroot@k8s-master01:~# kubectl get pods -n magedu NAME                                             READY   STATUS      RESTARTS       AGEmagedu-nginx-deployment-5589bbf4bc-6gd2w         1/1     Running     8 (144m ago)   11dmagedu-tomcat-app1-deployment-7754c8549c-c7rtb   1/1     Running     4 (145m ago)   11dmagedu-tomcat-app1-deployment-7754c8549c-prglk   1/1     Running     4 (145m ago)   11dmysql-0                                          2/2     Running     0              4m55smysql-1                                          2/2     Running     0              55smysql-2                                          2/2     Running     0              28mredis-0                                          1/1     Running     2 (145m ago)   8dredis-1                                          1/1     Running     2 (145m ago)   8dredis-2                                          1/1     Running     2 (145m ago)   8dredis-3                                          1/1     Running     2 (145m ago)   8dredis-4                                          1/1     Running     2 (145m ago)   8dredis-5                                          1/1     Running     2 (145m ago)   8dubuntu1804                                       0/1     Completed   0              8dzookeeper1-675c5477cb-vmwwq                      1/1     Running     4 (145m ago)   10dzookeeper2-759fb6c6f-7jktr                       1/1     Running     4 (145m ago)   10dzookeeper3-5c78bb5974-vxpbh                      1/1     Running     4 (145m ago)   10droot@k8s-master01:~#