K8s--09 编写mysql的持久化deployment

k8s实战--编写mysql的持久化deployment

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1.实验-编写mysql的持久化deployment
#先打标签
[root@node1 ~/volume]# kubectl label nodes node3 disktype=SSD
#编写资源清单
[root@node1 ~/volume]# cat mysql-hostpath-ssd.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-dp
  namespace: default
spec:
  selector:
    matchLabels:
      app: mysql 
  replicas: 1
  template: 
    metadata:
      name: mysql-pod
      namespace: default
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql-pod
        image: mysql:5.7 
        ports:
        - name: mysql-port
          containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "123456" 
        volumeMounts:
        - mountPath: /var/lib/mysql
          name: mysql-volume
      volumes:
      - name: mysql-volume
        hostPath:
          path: /data/mysql
          type: DirectoryOrCreate 
      nodeSelector:
        disktype: SSD


2.检查是否生成容器
[root@node1 ~/volume]# kubectl get pod
mysql-dp-d9dd6799d-rn4lf           1/1     Running   0          3m56s

3.登录并进入mysql镜像
[root@node1 ~/volume]# kubectl exec -it mysql-dp-d9dd6799d-rn4lf /bin/bash
root@mysql-dp-d9dd6799d-rn4lf:/# 

4.在容器里面登录数据库
root@mysql-dp-d9dd6799d-rn4lf:/# mysql -uroot -p123456

5.创建数据库并查看
mysql> create database dyc;
Query OK, 1 row affected (0.01 sec)
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| dyc                |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)


6.退出并删除mysql容器的资源清单
[root@node1 ~/volume]# kubectl delete -f  mysql-hostpath-ssd.yaml

7.再次应用资源清单
[root@node1 ~/volume]# kubectl create -f mysql-hostpath-ssd.yaml

8.登录新生成的数据库容器
[root@node1 ~/volume]# kubectl exec -it mysql-dp-d9dd6799d-dg6p8 /bin/bash
root@mysql-dp-d9dd6799d-dg6p8:/# 

9.登录容器中的数据可并查看之前创建的数据库是否存在
root@mysql-dp-d9dd6799d-dg6p8:/# mysql -uroot -p123456
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| dyc                |         #之前创建的数据库存在，即持久化成功
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

10.查看加点mysql容器是否把数据映射到宿主机
[root@node3 ~]# ll /data/mysql/
drwxr-x--- 2 polkitd input       20 3月   2 21:46 dyc
drwxr-x--- 2 polkitd input     4096 3月   2 21:40 mysql