docker--数据持久化之Data Volume

使用mysql为例

查看docker hub官方的mysql image 的dockerfile，有这一行：VOLUME /var/lib/mysql

-v给volume创建别名

[root@localhost ~]# docker run -d --name mysql1 -v mysql:/var/lib/mysql --name mysql1 -e MYSQL_ALLOW_EMPTY_PASSWORD=true mysql:5.7.26 
31584edba6eb9b4aa772076f1c2d73c5eb7b4f1e62dd24b41c68518bdf62e11a
[root@localhost ~]# 
[root@localhost ~]# docker volume ls
DRIVER              VOLUME NAME
local               mysql
[root@localhost ~]# docker container ls
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                 NAMES
31584edba6eb        mysql:5.7.26        "docker-entrypoint.s…"   47 seconds ago      Up 46 seconds       3306/tcp, 33060/tcp   mysql1
[root@localhost ~]# docker volume 
create   inspect  ls       prune    rm       
[root@localhost ~]# docker volume inspect mysql
[
    {
        "CreatedAt": "2019-07-22T03:09:06-07:00",
        "Driver": "local",
        "Labels": null,
        "Mountpoint": "/var/lib/docker/volumes/mysql/_data",#在宿主机的挂账路径
        "Name": "mysql",
        "Options": null,
        "Scope": "local"
    }
]
[root@localhost ~]# 

删了container，不删volume ，重新创建mysql container，数据还在

[root@localhost ~]# docker exec -it mysql1 /bin/bash
root@31584edba6eb:/# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.26 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 docker;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| docker             |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

mysql> exit
Bye
root@31584edba6eb:/# docker rm -f mysql1
bash: docker: command not found
root@31584edba6eb:/# exit               
exit
[root@localhost ~]# docker rm -f mysql1 
INFO[2019-07-22T03:24:25.954289600-07:00] ignoring event                                module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
WARN[2019-07-22T03:24:26.032476919-07:00] 31584edba6eb9b4aa772076f1c2d73c5eb7b4f1e62dd24b41c68518bdf62e11a cleanup: failed to unmount IPC: umount /var/lib/docker/containers/31584edba6eb9b4aa772076f1c2d73c5eb7b4f1e62dd24b41c68518bdf62e11a/mounts/shm, flags: 0x2: no such file or directory 
mysql1
[root@localhost ~]# docker volume ls 
DRIVER              VOLUME NAME
local               mysql
[root@localhost ~]# docker run -d --name mysql1 -v mysql:/var/lib/mysql --name mysql2 -e MYSQL_ALLOW_EMPTY_PASSWORD=true mysql:5.7.26 
877377cb64ec6242d2cd9e821d3978e7f5e6d2dce791d88e605e3f5b2a098762
[root@localhost ~]# docker exec -it mysql2 /bin/bash
root@877377cb64ec:/# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.26 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 |
| docker             |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

mysql>