076、创建Rex-Ray volume （2019-04-23 周二）
前面我们安装部署了 Rex-Ray ，并且成功配置 Virtualbox backend ，今天学习如何创建和使用 Rex-Ray volume
在 docker1 或 docker2 上执行如下命令创建 volume
rexray volume create --size 2 'c:\share\mysqldata'
--size 指定创建volume的大小，单位GB
最后是创建volume的绝对路径，因为 \ 是特殊字符，需要用单引号引起来
root@docker1:~# rexray volume create --size 2 'c:\share\mysqldata'
ID Name Status Size
cd335365-dea0-4e22-95ce-daa0258595e8 mysqldata available 2
root@docker1:~# rexray volume ls
ID Name Status Size
c2b3c553-dc43-4df1-8a72-faa26a9ee861 docker1.vmdk attached 20
cec5b10d-8bc1-4326-bb9b-e3add075f3f1 docker2.vmdk unavailable 20
cd335365-dea0-4e22-95ce-daa0258595e8 mysqldata available 2
root@docker1:~# docker volume ls
DRIVER VOLUME NAME
rexray docker1.vmdk
rexray docker2.vmdk
rexray mysqldata
创建mysql容器并使用Rex-Ray volume
root@docker1:~# docker run --name mydb_on_docker1 -v mysqldata:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=passw0rd -d mysql
root@docker1:~# docker volume inspect mysqldata
[
{
"CreatedAt": "0001-01-01T00:00:00Z",
"Driver": "rexray",
"Labels": null,
"Mountpoint": "",
"Name": "mysqldata",
"Options": null,
"Scope": "global",
"Status": {
"availabilityZone": "",
"fields": null,
"iops": 0,
"name": "mysqldata",
"server": "virtualbox",
"service": "virtualbox",
"size": 2,
"type": "HardDisk"
}
}
]
root@docker1:~# docker inspect mydb_on_docker1 | jq .[0].Mounts
[
{
"Type": "volume",
"Name": "mysqldata",
"Source": "",
"Destination": "/var/lib/mysql",
"Driver": "rexray",
"Mode": "",
"RW": true,
"Propagation": ""
}
]
下图可以看到 Rex-Ray volume mysqldata 已经挂载到docker1 上
当前实验拓扑如下图所示：
下面登录数据库，并对数据库就行一些修改，然后销毁mysql容器
root@docker1:~# docker exec -it mydb_on_docker1 bash
root@f00b063008f8:/# mysql -p # 登录数据库
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.15 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> use mysql # 切换到mysql库
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> create table my_id(id int(4)); # 创建表
Query OK, 0 rows affected (0.03 sec)
mysql> insert my_id values(111); # 在表中插入数据
Query OK, 1 row affected (0.01 sec)
mysql> select * from my_id; # 查询表中数据
+------+
| id |
+------+
| 111 |
+------+
1 row in set (0.00 sec)
mysql> exit
Bye
root@f00b063008f8:/# exit
root@docker1:~# docker stop mydb_on_docker1 # stop容器
mydb_on_docker1
root@docker1:~# docker rm mydb_on_docker1 # 销毁容器
mydb_on_docker1
最后可以看到，mysqldata 自动从docker1 上卸载了
