使用Kubernetes集群环境部署MySQL数据库的实战记录

1 编写 mysql.yaml文件

编写yaml如下

apiversion: v1
kind: namespace
metadata:
  name: devops   # namespace 的名称
---
apiversion: apps/v1
kind: deployment
metadata:
  name: devops-mysql   # deployment控制器名称
  namespace: devops
spec:
  replicas: 1
  revisionhistorylimit: 5
  strategy:
    type: rollingupdate
  selector:
    matchlabels:
      app: devops-mysql
  template:
    metadata:
      labels:
        app: devops-mysql
    spec:
      volumes:
        - name: devops-mysql
          nfs:
            server: xx.xx.xx.xx  # 修改为挂载存储的服务器ip
            path: /root/data/nfs/mysql/devops   # 修改为存储服务器的存储挂载路径
      containers:
        - name: devops-mysql
          image: mysql:5.7
          env:
            - name: mysql_root_password
              value: xxxxxxxx     # 设置mysql数据库登录密码
          imagepullpolicy: always
          ports:
            - containerport: 3306
          volumemounts:
            - name: devops-mysql
              mountpath: /var/lib/mysql
---
apiversion: v1
kind: service
metadata:
  name: devops-mysql    # 数据库服务的名称
  namespace: devops
spec:
  ports:
    - port: 3306
      protocol: tcp
      targetport: 3306
      nodeport: 30001    # 对外访问的端口
  selector:
    app: devops-mysql
  type: nodeport
  sessionaffinity: clientip   

2 执行如下命令创建

kubectl apply -f mysql.yaml

3 通过如下命令查看创建结果

使用如下命令查看

kubectl get pod -n devops | grep mysql

如：

[root@master ~]# kubectl get pod -n devops | grep mysql
devops-mysql-59b68c47d4-ttbng               1/1     running   0          23h
[root@master ~]#

4 命令行进入pod并登录mysql

如下;

[root@master ~]# kubectl exec -it devops-mysql-59b68c47d4-ttbng bash -n devops
kubectl exec [pod] [command] is deprecated and will be removed in a future version. use kubectl exec [pod] -- [command] instead.
root@devops-mysql-59b68c47d4-ttbng:/# mysql -uroot -p
enter password:
welcome to the mysql monitor.  commands end with ; or \g.
your mysql connection id is 13
server 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 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                |
+--------------------+
5 rows in set (0.01 sec)

mysql>

5 至此，数据库已经安装完成，然后即可通过ip+端口，这里是30001，进行数据库链接了

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