k8s部署mysql服务(RC部署)

秒速五厘米 2023-02-13 14:48 35阅读 0赞

编写mysql-rc.yaml文件

apiVersion: v1
    kind: ReplicationController
    metadata:
      name: mysql-rc
      labels:
        name: mysql-rc
    spec:
      replicas: 1
      selector:
        name: mysql-pod
      template:
        metadata:
          labels:
            name: mysql-pod
        spec:
          containers:
            - name: mysql
              image: mysql:5.7
              imagePullPolicy: IfNotPresent
              ports:
                - containerPort: 3306
              volumeMounts:
                - mountPath: /var/lib/mysql
                  name: mydata
              env:
                - name: MYSQL_ROOT_PASSWORD
                  value: "root"
          volumes:
            - name: mydata
              hostPath:
               path: /root/mysql/data

创建mysql-rc pod

[root@master mysql]# kubectl apply -f mysql-rc.yaml -n gridcloud
    replicationcontroller/mysql-rc created

编写mysql-service.yaml文件

apiVersion: v1
    kind: Service
    metadata:
      name: mysql-svc
      labels:
        name: mysql-svc
    spec:
      type: NodePort
      ports:
        - port: 3306
          targetPort: 3306
          nodePort: 30306
      selector:
        name: mysql-pod

启动mysql-service pod

[root@master mysql]# kubectl apply -f mysql-service.yaml -n gridcloud
    service/mysql-svc created

查看我们的pod情况

[root@master mysql]# kubectl get pods -n gridcloud
    NAME                                 READY   STATUS              RESTARTS   AGE
    mysql-rc-d2whh                       0/1     ContainerCreating   0          59s

显示正在创建并查看该pod信息

[root@master mysql]# kubectl describe pod mysql-rc-d2whh -n gridcloud
    Name:         mysql-rc-d2whh
    Namespace:    gridcloud
    Priority:     0
    Node:         node2/192.168.0.153
    Start Time:   Sat, 30 May 2020 00:28:52 +0800
    Labels:       name=mysql-pod
    Annotations:  <none>
    Status:       Running
    IP:           10.244.2.49
    IPs:
      IP:           10.244.2.49
    Controlled By:  ReplicationController/mysql-rc
    Containers:
      mysql:
        Container ID:   docker://64769dcdc408ecd690707aa4ce56bc6ddfed7b41e46cf3c7f8d99461788944d1
        Image:          mysql:5.7
        Image ID:       docker-pullable://mysql@sha256:d16d9ef7a4ecb29efcd1ba46d5a82bda3c28bd18c0f1e3b86ba54816211e1ac4
        Port:           3306/TCP
        Host Port:      0/TCP
        State:          Running
          Started:      Sat, 30 May 2020 00:30:35 +0800
        Ready:          True
        Restart Count:  0
        Environment:
          MYSQL_ROOT_PASSWORD:  root
        Mounts:
          /var/lib/mysql from mydata (rw)
          /var/run/secrets/kubernetes.io/serviceaccount from default-token-sq8nw (ro)
    Conditions:
      Type              Status
      Initialized       True 
      Ready             True 
      ContainersReady   True 
      PodScheduled      True 
    Volumes:
      mydata:
        Type:          HostPath (bare host directory volume)
        Path:          /root/mysql/data
        HostPathType:  
      default-token-sq8nw:
        Type:        Secret (a volume populated by a Secret)
        SecretName:  default-token-sq8nw
        Optional:    false
    QoS Class:       BestEffort
    Node-Selectors:  <none>
    Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                     node.kubernetes.io/unreachable:NoExecute for 300s
    Events:
      Type    Reason     Age    From               Message
      ----    ------     ----   ----               -------
      Normal  Scheduled  2m38s  default-scheduler  Successfully assigned gridcloud/mysql-rc-d2whh to node2
      Normal  Pulling    2m38s  kubelet, node2     Pulling image "mysql:5.7"
      Normal  Pulled     57s    kubelet, node2     Successfully pulled image "mysql:5.7"
      Normal  Created    56s    kubelet, node2     Created container mysql
      Normal  Started    56s    kubelet, node2     Started container mysql

最后显示创建成功，最后在查询状态

[root@master mysql]# kubectl get pods -n gridcloud
    NAME                                 READY   STATUS    RESTARTS   AGE
    mysql-rc-d2whh                       1/1     Running   0          2m48s

显示running状态，表示创建成功，并查看详细信息显示分配在node2上，如下

[root@master mysql]# kubectl get pods -n gridcloud -o wide
    NAME            READY  STATUS  RESTARTS  AGE       IP         NODE    NOMINATED     NODE   READINESS GATES
    mysql-rc-d2whh   1/1   Running   0      5m28s   10.244.2.49   node2   <none>                 <none>

登录数据库，并创建一个库，做测试

[root@manage-host bin]# mysql -uroot -h 192.168.0.155 -P 30306 -p
    Enter password: 
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 3
    Server version: 5.7.30 MySQL Community Server (GPL)
    
    Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
    
    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> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    | performance_schema |
    | sys                |
    +--------------------+
    4 rows in set (0.00 sec)
    
    mysql> create database test;
    Query OK, 1 row affected (0.00 sec)
    
    mysql> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    | performance_schema |
    | sys                |
    | test               |
    +--------------------+
    5 rows in set (0.00 sec)
    
    mysql> quit
    Bye

最后我们看我们挂载的路径下有我们的数据库数据信息，此时在node2上查看（前后多了一个test）

[root@node2 ~]# ls /root/mysql/data/
    auto.cnf    ca.pem           client-key.pem  ibdata1      ib_logfile1  mysql               private_key.pem  server-cert.pem  sys
    ca-key.pem  client-cert.pem  ib_buffer_pool  ib_logfile0  ibtmp1       performance_schema  public_key.pem   server-key.pem
    [root@node2 ~]# cd /root/mysql/data/
    [root@node2 data]# ls
    auto.cnf    ca.pem           client-key.pem  ibdata1      ib_logfile1  mysql               private_key.pem  server-cert.pem  sys
    ca-key.pem  client-cert.pem  ib_buffer_pool  ib_logfile0  ibtmp1       performance_schema  public_key.pem   server-key.pem   test

接着我们就重启下pod看看我们的数据库信息是否可查

[root@master mysql]# kubectl get pods -n gridcloud
    NAME                                 READY   STATUS    RESTARTS   AGE
    mysql-rc-d2whh                       1/1     Running   0          72m
    
    [root@master mysql]# kubectl delete pod mysql-rc-d2whh -n gridcloud
    pod "mysql-rc-d2whh" deleted
    [root@master mysql]# kubectl apply -f mysql-service.yaml -n gridcloud
    service/mysql-svc unchanged

然后我们重新登录数据库查看刚刚创建的库是否存在

[root@manage-host bin]# mysql -uroot -h 192.168.0.155 -P 30306 -p
    Enter password: 
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 2
    Server version: 5.7.30 MySQL Community Server (GPL)
    
    Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
    
    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> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    | performance_schema |
    | sys                |
    | test               |
    +--------------------+
    5 rows in set (0.00 sec)

显示我们的数据没丢失，至此数据库部署成功