Kubernetes集群部署Mysql集群

---

---

一、Ansible安装NFS服务

kubernets集群信息如下：

[root@master ansible]# cat hosts.ini
[k8s-master]
master

[k8s-nodes]
node1
node2

[k8s]

[k8s:children]
k8s-master
k8s-nodes
[root@master ansible]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.76.100 master
192.168.76.101 node1
192.168.76.102 node2

所有节点安装nfs并设置开机自启：

[root@master ansible]# cat deploy-nfs.yaml
- name: deploy docker
  hosts: k8s
  gather_facts: no
  vars:
    pkgs_dir: /nfs-pkg
    pkgs:
      - nfs-utils
      - rpcbind

    #变量 download_host 需要手动设置
    #且值需要是此 playbook 目标主机中的一个
    #需要写在 inventory 文件中的名称
    download_host: "master"

  tasks:
    - name: 创建存放 rmp 包的目录
      when: inventory_hostname == download_host
      file:
        path: "{{ pkgs_dir }}"
        state: directory
      tags:
        - deploy

    - name:  开始下载软件包
      when: inventory_hostname == download_host
      yum:
        name: "{{ pkgs }}"
        download_only: yes
        download_dir: "{{ pkgs_dir }}"
      tags:
        - deploy

    - name: 传输 rpm 包到远程节点
      when: inventory_hostname != download_host
      copy:
        src: "{{ pkgs_dir }}"
        dest: "/"
      tags:
        - deploy

    - name: 正在执行从本地安装软件包
      shell:
        cmd: yum -y localinstall *
        chdir: "{{ pkgs_dir }}"
        warn: no
      async: 600
      poll: 0
      tags:
        - deploy

    - name: 启动 nfs
      systemd:
        name: nfs
        enabled: yes
        state: started
    - name: 启动 rpcbind
      systemd:
        name: rpcbind
        enabled: yes
        state: started

[root@master ansible]# ansible-playbook -i hosts.ini deploy-nfs.yaml
 [WARNING] Ansible is being run in a world writable directory (/etc/ansible), ignoring it as an ansible.cfg source. For more information see https://docs.ansible.com/ansible/devel/reference_appendices/config.html#cfg-in-world-writable-dir
[WARNING]: Invalid characters were found in group names but not replaced, use -vvvv to see details

PLAY [deploy docker] *******************************************************************************************************************************************************************

TASK [创建存放 rmp 包的目录] *******************************************************************************************************************************************************************
skipping: [node1]
skipping: [node2]
ok: [master]

TASK [开始下载软件包] *************************************************************************************************************************************************************************
skipping: [node1]
skipping: [node2]
ok: [master]

TASK [传输 rpm 包到远程节点] *******************************************************************************************************************************************************************
skipping: [master]
ok: [node2]
ok: [node1]

TASK [正在执行从本地安装软件包] ********************************************************************************************************************************************************************
changed: [node1]
changed: [node2]
changed: [master]

TASK [启动 nfs] **************************************************************************************************************************************************************************
ok: [node1]
ok: [master]
changed: [node2]

TASK [启动 rpcbind] **********************************************************************************************************************************************************************
ok: [node2]
ok: [node1]
ok: [master]

PLAY RECAP *****************************************************************************************************************************************************************************
master                     : ok=5    changed=1    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0
node1                      : ok=4    changed=1    unreachable=0    failed=0    skipped=2    rescued=0    ignored=0
node2                      : ok=4    changed=2    unreachable=0    failed=0    skipped=2    rescued=0    ignored=0

安装成功，创建挂载：

# 创建共享目录  master上操作
mkdir /home/data
# 设置环境变量
vi /etc/exports
# 添加以下内容
/home/data *(insecure,rw,sync,no_subtree_check,no_root_squash)
# 重启服务
systemctl restart nfs rpcbind
#查看共享目录
showmount -e

#创建共享目录 nodes上操作
mkdir -p ~/volume/node1
# 挂载
mount -t nfs 192.168.76.100:/home/data ~/volume/node1
# 查看挂载结果
df -h

[root@node1 ~]# df -h
Filesystem                 Size  Used Avail Use% Mounted on
devtmpfs                   963M     0  963M   0% /dev
tmpfs                      977M     0  977M   0% /dev/shm
tmpfs                      977M  9.5M  968M   1% /run
tmpfs                      977M     0  977M   0% /sys/fs/cgroup
/dev/mapper/centos-root     17G  6.3G   11G  37% /
/dev/sda1                 1014M  219M  796M  22% /boot
tmpfs                      1.9G   12K  1.9G   1% /var/lib/kubelet/pods/ec1c0e84-6d0e-404                                                                                                2-8581-6ff4c3c7bc2f/volumes/kubernetes.io~projected/kube-api-access-x4sbm
tmpfs                      1.9G   12K  1.9G   1% /var/lib/kubelet/pods/df3eb1bb-a156-4ec                                                                                                c-9e85-5802c3e6d86d/volumes/kubernetes.io~projected/kube-api-access-4zpps
overlay                     17G  6.3G   11G  37% /var/lib/docker/overlay2/d2cadab12b70d0                                                                                                f7f260b99959b37d1da16928ccb9ad23102faea808d2e9febe/merged
shm                         64M     0   64M   0% /var/lib/docker/containers/8f3724de8ea7                                                                                                03dc3ce7f49ae0f0225586877deb11fbdba4d1728ec2a639dd1e/mounts/shm
overlay                     17G  6.3G   11G  37% /var/lib/docker/overlay2/54d872067cdf7a                                                                                                bb1849de13d13043cfae0a3dc30861e2065a9212b37dca4210/merged
shm                         64M     0   64M   0% /var/lib/docker/containers/09ed2454c42d                                                                                                101e68fb2412853d110e18a8e45a5b6458d6f8dcd26be7a813b6/mounts/shm
overlay                     17G  6.3G   11G  37% /var/lib/docker/overlay2/95edd93cc29fc3                                                                                                8a9aab4c17e87bf59e93a6a20a3ef766b42a04a8bc09f7f300/merged
overlay                     17G  6.3G   11G  37% /var/lib/docker/overlay2/a6daa65abf3faf                                                                                                e28c115744768bad9ee7ef1c786550d1b9d8e822197a5f4f58/merged
tmpfs                      196M     0  196M   0% /run/user/0
192.168.76.100:/home/data   17G  8.9G  8.2G  53% /root/volume/node1

二、使用NFS实现持久化

1、部署 Rbac

[root@master k8s]# cat rbac.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: nfs-client-provisioner-runner
rules:
  - 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"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-client-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: ClusterRole
  name: nfs-client-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
   # replace with namespace where provisioner is deployed
  namespace: default
rules:
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io

部署rbac配置文件：

kubectl apply -f rbac.yaml

2、部署 Deployment

[root@master k8s]# cat deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nfs-client-provisioner
  labels:
    app: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: nfs-client-provisioner
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccountName: nfs-client-provisioner
      containers:
        - name: nfs-client-provisioner
          image: quay.io/external_storage/nfs-client-provisioner:latest
          volumeMounts:
            - name: nfs-client-root
              mountPath: /home/data
          env:
            - name: PROVISIONER_NAME
              value: nfs-diy # StorageClass 三个重要字段之一 Provisioner，名字自己指定
            - name: NFS_SERVER
              value: 192.168.76.100 # nfs 服务器地址
            - name: NFS_PATH
              value: /home/data # nfs 共享文件夹
      volumes:
        - name: nfs-client-root
          nfs:
            server: 192.168.76.100 # nfs 服务器地址
            path: /home/data # nfs 共享文件夹

部署deployment:

kubectl apply -f deployment.yaml

3、部署 StorageClass

每个 StorageClass 都包含 provisioner、parameters 和 reclaimPolicy 字段， 这些字段会在 StorageClass 需要动态分配 PersistentVolume 时会使用到。

StorageClass 对象的命名很重要，用户使用这个命名来请求生成一个特定的类。 当创建 StorageClass 对象时，管理员设置 StorageClass 对象的命名和其他参数，一旦创建了对象就不能再对其更新。

[root@master k8s]# cat class.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-storage # 这个名字很重要，后面要用到
provisioner: nfs-diy # 和 deployment.yaml 中 env.PROVISIONER_NAME 保持一致
reclaimPolicy: Retain
parameters:
  archiveOnDelete: "false"

部署StorageClass：

kubectl apply -f class.yaml

三、部署Mysql集群

1、创建命名空间 Namespace

[root@master k8s]# cat namespace.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: mysql
  labels:
    app: mysql

部署namespace：

kubectl apply -f namespace.yaml

2、连接数据库

[root@master k8s]# cat secret.yaml
apiVersion: v1
kind: Secret
metadata:
  name: mysql-secret
  namespace: mysql
  labels:
    app: mysql
type: Opaque
data:
  password: MTIzNDU2 # echo -n "123456" | base64

部署secret.yaml:

kubectl apply -f secret.yaml

3、创建一个 ConfigMap

[root@master k8s]# cat mysql-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql
  namespace: mysql
  labels:
    app: mysql
data:
  master.cnf: |
    # Master
    [mysqld]
    log-bin=mysqllog
    skip-name-resolve
  slave.cnf: |
    # Slave
    [mysqld]
    super-read-only
    skip-name-resolve
    log-bin=mysql-bin
    replicate-ignore-db=mysql

部署mysql-configmap.yaml：

kubectl apply -f mysql-configmap.yaml

4、创建 Service

[root@master k8s]# cat mysql-services.yaml
apiVersion: v1
kind: Service
metadata:
  name: mysql
  namespace: mysql
  labels:
    app: mysql
spec:
  type: NodePort
  ports:
  - name: mysql
    port: 3306
    nodePort: 30002 #对外暴露的端口
  selector:
    app: mysql
---
apiVersion: v1
kind: Service
metadata:
  name: mysql-read
  namespace: mysql
  labels:
    app: mysql
spec:
  ports:
  - name: mysql
    port: 3306
  selector:
    app: mysql

部署mysql-service.yaml：

kubectl apply -f mysql-services.yaml

5、创建 StatefulSet

[root@master k8s]# cat mysql-statefulset.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql
  namespace: mysql
  labels:
    app: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  serviceName: mysql
  replicas: 2 # 副本数量，集群中的数量
  template:
    metadata:
      labels:
        app: mysql
    spec:
      initContainers:
      - name: init-mysql
        image: mysql:5.7
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
        command:
        - bash
        - "-c"
        - |
          set -ex
          # 从 Pod 的序号，生成 server-id
          [[ $(hostname) =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          echo [mysqld] > /mnt/conf.d/server-id.cnf
          # 由于 server-id 不能为 0，因此给 ID 加 100 来避开它
          echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
          # 如果 Pod 的序号为 0，说明它是 Master 节点，从 ConfigMap 里把 Master 的配置文件拷贝到 /mnt/conf.d 目录下
          # 否则，拷贝 ConfigMap 里的 Slave 的配置文件
          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
        image: registry.cn-shenzhen.aliyuncs.com/jbjb/csi:xtrabackup-1.0
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
        command:
        - bash
        - "-c"
        - |
          set -ex
          # 拷贝操作只需要在第一次启动时进行，所以数据已经存在则跳过
          [[ -d /var/lib/mysql/mysql ]] && exit 0
          # Master 节点（序号为 0）不需要这个操作
          [[ $(hostname) =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          [[ $ordinal == 0 ]] && exit 0
          # 使用 ncat 指令，远程地从前一个节点拷贝数据到本地
          ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql
          # 执行 --prepare，这样拷贝来的数据就可以用作恢复了
          xtrabackup --prepare --target-dir=/var/lib/mysql
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: conf
          mountPath: /etc/mysql/conf.d
      containers:
      - name: mysql
        image: mysql:5.7
        env:
#        - name: MYSQL_ALLOW_EMPTY_PASSWORD
#          value: "1"
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
        ports:
        - name: mysql
          containerPort: 3306
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: conf
          mountPath: /etc/mysql/conf.d
        resources:
          requests:
            cpu: 500m
            memory: 1Gi
        livenessProbe:
          exec:
            command: ["mysqladmin", "ping", "-uroot", "-p${MYSQL_ROOT_PASSWORD}"]
          initialDelaySeconds: 30
          periodSeconds: 10
          timeoutSeconds: 5
        readinessProbe:
          exec:
            command: ["mysqladmin", "ping", "-uroot", "-p${MYSQL_ROOT_PASSWORD}"]
          initialDelaySeconds: 5
          periodSeconds: 2
          timeoutSeconds: 1
      - name: xtrabackup
        image: gcr.io/google-samples/xtrabackup:1.0
        image: registry.cn-shenzhen.aliyuncs.com/jbjb/csi:xtrabackup-1.0
        ports:
        - name: xtrabackup
          containerPort: 3307
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
        command:
        - bash
        - "-c"
        - |
          set -ex
          cd /var/lib/mysql
          # 从备份信息文件里读取 MASTER_LOG_FILE 和 MASTER_LOG_POS 这 2 个字段的值，用来拼装集群初始化 SQL
          if [[ -f xtrabackup_slave_info ]]; then
            # 如果 xtrabackup_slave_info 文件存在，说明这个备份数据来自于另一个 Slave 节点
            # 这种情况下，XtraBackup 工具在备份的时候，就已经在这个文件里自动生成了 "CHANGE MASTER TO" SQL 语句
            # 所以，只需要把这个文件重命名为 change_master_to.sql.in，后面直接使用即可
            mv xtrabackup_slave_info change_master_to.sql.in
            # 所以，也就用不着 xtrabackup_binlog_info 了
            rm -f xtrabackup_binlog_info
          elif [[ -f xtrabackup_binlog_info ]]; then
            # 如果只是存在 xtrabackup_binlog_info 文件，说明备份来自于 Master 节点，就需要解析这个备份信息文件，读取所需的两个字段的值
            [[ $(cat xtrabackup_binlog_info) =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
            rm xtrabackup_binlog_info
            # 把两个字段的值拼装成 SQL，写入 change_master_to.sql.in 文件
            echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\
                  MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in
          fi
          # 如果存在 change_master_to.sql.in，就意味着需要做集群初始化工作
          if [[ -f change_master_to.sql.in ]]; then
            # 但一定要先等 MySQL 容器启动之后才能进行下一步连接 MySQL 的操作
            echo "Waiting for mysqld to be ready（accepting connections）"
            until mysql -h 127.0.0.1 -uroot -p${MYSQL_ROOT_PASSWORD} -e "SELECT 1"; do sleep 1; done
            echo "Initializing replication from clone position"
            # 将文件 change_master_to.sql.in 改个名字
            # 防止这个 Container 重启的时候，因为又找到了 change_master_to.sql.in，从而重复执行一遍初始化流程
            mv change_master_to.sql.in change_master_to.sql.orig
            # 使用 change_master_to.sql.orig 的内容，也就是前面拼装的 SQL，组成一个完整的初始化和启动 Slave 的 SQL 语句
            mysql -h 127.0.0.1 -uroot -p${MYSQL_ROOT_PASSWORD} << EOF
          $(< change_master_to.sql.orig),
            MASTER_HOST='mysql-0.mysql.mysql',
            MASTER_USER='root',
            MASTER_PASSWORD='${MYSQL_ROOT_PASSWORD}',
            MASTER_CONNECT_RETRY=10;
          START SLAVE;
          EOF
          fi
          # 使用 ncat 监听 3307 端口。
          # 它的作用是，在收到传输请求的时候，直接执行 xtrabackup --backup 命令，备份 MySQL 的数据并发送给请求者
          exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \
            "xtrabackup --backup --slave-info --stream=xbstream --host=127.0.0.1 --user=root --password=${MYSQL_ROOT_PASSWORD}"
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: conf
          mountPath: /etc/mysql/conf.d
      volumes:
      - name: conf
        emptyDir: {}
      - name: config-map
        configMap:
          name: mysql
  volumeClaimTemplates:
  - metadata:
      name: data
      #annotations:
       #volume.beta.kubernetes.io/storage-class: nfs-csi
    spec:
      accessModes:
      - "ReadWriteOnce"
      storageClassName: nfs-storage #需要和你自己创建的class.yaml保持名称一致
      resources:
        requests:
          storage: 5Gi

部署mysql-statefulset：

kubectl apply -f mysql-statefulset.yaml

四、验证部署情况

通过运行以下命令查看启动进度：

[root@master k8s]# kubectl get pods -n mysql
NAME      READY   STATUS    RESTARTS   AGE
mysql-0   2/2     Running   0          70m
mysql-1   2/2     Running   0          70m

检查主从状态：

[root@master k8s]# kubectl -n mysql exec mysql-1 -c mysql -- bash -c "mysql -uroot -p123456 -e 'show slave status \G'"
mysql: [Warning] Using a password on the command line interface can be insecure.
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: mysql-0.mysql.mysql
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: mysqllog.000003
          Read_Master_Log_Pos: 154
               Relay_Log_File: mysql-1-relay-bin.000002
                Relay_Log_Pos: 319
        Relay_Master_Log_File: mysqllog.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: mysql
           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: 154
              Relay_Log_Space: 528
              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: 0
Master_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: 469ced73-2518-11ed-9138-1e82d73ed269
             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:

通过主库访问，创建表，插入数据：

[root@master k8s]# kubectl exec -it mysql-0 -n mysql /bin/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 -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2592
Server 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 its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create database test;
Query OK, 1 row affected (0.04 sec)

mysql> use test;
Database changed
mysql> create table table1(Name text);
Query OK, 0 rows affected (0.07 sec)

mysql> insert into table1 values("ShanHai");
Query OK, 1 row affected (0.05 sec)

mysql>

通过从库访问，获取插入的数据：

[root@master k8s]# kubectl exec -it mysql-1 -n mysql /bin/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:/# mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1752
Server 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 its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from table1;
+---------+
| Name    |
+---------+
| ShanHai |
+---------+
1 row in set (0.00 sec)

mysql>

五、部署时出现的问题

在部署时，出现问题，通过以下指令查看：

[root@master k8s]# kubectl describe pods/mysql-1 -n mysql

可以看到报错为找不到对应的文件或文件夹，在显示出的相应目录下创建缺失的文件或文件夹。

[root@master run]# mkdir -p /home/data/mysql-data-mysql-0-pvc-f4c40880-65ed-4e74-8184-f94b4b003942
[root@master run]# mkdir -p /home/data/mysql-data-mysql-1-pvc-06487971-bb9b-4fe1-b81e-2a7a9a5241a7
[root@master run]# cd /home/data/
[root@master data]# ls
mysql-data-mysql-0-pvc-f4c40880-65ed-4e74-8184-f94b4b003942  mysql-data-mysql-1-pvc-06487971-bb9b-4fe1-b81e-2a7a9a5241a7

重新执行kubectl apply -f mysql-statefulset.yaml后，可以看到后面已经成功，开始拉取镜像了。
再次执行 kubectl get pods -n mysql查看部署状态，可以看到mysql集群已经成功部署。

Warning  FailedMount  5m1s (x3 over 16m)  kubelet  Unable to attach or mount volumes: unmounted volumes=[data], unattached volumes=[conf config-map kube-api-access-4g282 data]: timed out waiting for the condition
  Normal   Pulling      3m44s               kubelet  Pulling image "mysql:5.7"
  Normal   Pulled       110s                kubelet  Successfully pulled image "mysql:5.7" in 1m54.443692625s
  Normal   Created      110s                kubelet  Created container init-mysql
  Normal   Started      109s                kubelet  Started container init-mysql
  Normal   Pulling      109s                kubelet  Pulling image "registry.cn-shenzhen.aliyuncs.com/jbjb/csi:xtrabackup-1.0"
  Normal   Pulled       28s                 kubelet  Successfully pulled image "registry.cn-shenzhen.aliyuncs.com/jbjb/csi:xtrabackup-1.0" in 1m20.329858145s
  Normal   Created      27s                 kubelet  Created container clone-mysql
  Normal   Started      27s                 kubelet  Started container clone-mysql
[root@master k8s]# kubectl get pods -n mysql
NAME      READY   STATUS     RESTARTS   AGE
mysql-0   2/2     Running    0          25m
mysql-1   0/2     Init:1/2   0          25m
[root@master k8s]# kubectl get pods -n mysql
NAME      READY   STATUS    RESTARTS   AGE
mysql-0   2/2     Running   0          26m
mysql-1   2/2     Running   0          26m

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