docker 6：容器之间共享磁盘

创建三个容器，然后共享磁盘，实现文件在三个容器之间传递同步修改。

创建容器docker01，然后创建docker02和docker03继承docker01，即可实现文件的共享。

[root@localhost ~]# docker images 
REPOSITORY            TAG       IMAGE ID       CREATED        SIZE
volume1/centos        latest    04b2be41fc6c   3 hours ago    209MB
1. 创建并运行docker01：
[root@localhost ~]# docker run -it --name docker01 volume1/centos
[root@cc5648abda23 /]# ls -l
total 0
lrwxrwxrwx.   1 root root   7 Nov  3 15:22 bin -> usr/bin
drwxr-xr-x.   2 root root   6 Apr  1 10:08 dataVolume1
drwxr-xr-x.   2 root root   6 Apr  1 10:08 dataVolume2

　　进入共享目录，创建1.txt
[root@cc5648abda23 /]# cd /dataVolume1
[root@cc5648abda23 dataVolume1]# touch 1.txt
[root@cc5648abda23 dataVolume1]# ls
1.txt

[root@localhost ~]# docker ps
CONTAINER ID   IMAGE                 COMMAND                  CREATED          STATUS          PORTS                               NAMES
cc5648abda23   volume1/centos        "/bin/sh -c /bin/bash"   22 seconds ago   Up 19 seconds                                       docker01

2.创建并运行docker02：

[root@localhost ~]# docker run -it --name docker02 --volumes-from docker01 volume1/centos
[root@d3029b48260e /]# ls -l
total 0
lrwxrwxrwx.   1 root root   7 Nov  3 15:22 bin -> usr/bin
drwxr-xr-x.   2 root root  19 Apr  1 10:09 dataVolume1
drwxr-xr-x.   2 root root   6 Apr  1 10:08 dataVolume2

　　可以看到1.txt，创建2.txt
[root@d3029b48260e /]# cd dataVolume1
[root@d3029b48260e dataVolume1]# ls -l
total 0
-rw-r--r--. 1 root root 0 Apr  1 10:09 1.txt
[root@d3029b48260e dataVolume1]# touch 2.txt
[root@d3029b48260e dataVolume1]# ls -l
total 0
-rw-r--r--. 1 root root 0 Apr  1 10:09 1.txt
-rw-r--r--. 1 root root 0 Apr  1 10:11 2.txt

3.创建并运行docker03：
[root@localhost ~]# docker run -it --name docker03 --volumes-from docker01 volume1/centos
[root@70c8a7164cda /]# ls -l
total 0
lrwxrwxrwx.   1 root root   7 Nov  3 15:22 bin -> usr/bin
drwxr-xr-x.   2 root root  32 Apr  1 10:11 dataVolume1
drwxr-xr-x.   2 root root   6 Apr  1 10:08 dataVolume2

　　可以看到1.txt和2.txt，创建3.txt
[root@70c8a7164cda /]# cd dataVolume1
[root@70c8a7164cda dataVolume1]# ls -l
total 0
-rw-r--r--. 1 root root 0 Apr  1 10:09 1.txt
-rw-r--r--. 1 root root 0 Apr  1 10:11 2.txt
[root@70c8a7164cda dataVolume1]# touch 3.txt
[root@70c8a7164cda dataVolume1]# ls -l
total 0
-rw-r--r--. 1 root root 0 Apr  1 10:09 1.txt
-rw-r--r--. 1 root root 0 Apr  1 10:11 2.txt
-rw-r--r--. 1 root root 0 Apr  1 10:12 3.txt

[root@localhost ~]# docker ps
CONTAINER ID   IMAGE                 COMMAND                  CREATED              STATUS              PORTS                               NAMES
70c8a7164cda   volume1/centos        "/bin/sh -c /bin/bash"   40 seconds ago       Up 38 seconds                                           docker03
d3029b48260e   volume1/centos        "/bin/sh -c /bin/bash"   About a minute ago   Up About a minute                                       docker02
cc5648abda23   volume1/centos        "/bin/sh -c /bin/bash"   3 minutes ago        Up 3 minutes                                            docker01

其实这个时候我们去看三个容器的挂载情况，会发现他们的挂载是一样的，都是对应的宿主机的相同文件夹：

[root@localhost ~]# docker inspect d3029b48260e 
        "Mounts": [
            {
                "Type": "volume",
                "Name": "3d78455dc61c42b02ed985c140fa5df799b722db481535c33a7af20c9ef777f4",
                "Source": "/var/lib/docker/volumes/3d78455dc61c42b02ed985c140fa5df799b722db481535c33a7af20c9ef777f4/_data",
                "Destination": "/dataVolume1",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "7d63ce25e13f6d382ac748acd1fcdeab7af505dc98ce95e54e4ab4e87a4c83d9",
                "Source": "/var/lib/docker/volumes/7d63ce25e13f6d382ac748acd1fcdeab7af505dc98ce95e54e4ab4e87a4c83d9/_data",
                "Destination": "/dataVolume2",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],

[root@localhost ~]# docker inspect 70c8a7164cda
Mounts

        "Mounts": [
            {
                "Type": "volume",
                "Name": "3d78455dc61c42b02ed985c140fa5df799b722db481535c33a7af20c9ef777f4",
                "Source": "/var/lib/docker/volumes/3d78455dc61c42b02ed985c140fa5df799b722db481535c33a7af20c9ef777f4/_data",
                "Destination": "/dataVolume1",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "7d63ce25e13f6d382ac748acd1fcdeab7af505dc98ce95e54e4ab4e87a4c83d9",
                "Source": "/var/lib/docker/volumes/7d63ce25e13f6d382ac748acd1fcdeab7af505dc98ce95e54e4ab4e87a4c83d9/_data",
                "Destination": "/dataVolume2",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
[root@localhost ~]# docker inspect cc5648abda23
        "Mounts": [
            {
                "Type": "volume",
                "Name": "3d78455dc61c42b02ed985c140fa5df799b722db481535c33a7af20c9ef777f4",
                "Source": "/var/lib/docker/volumes/3d78455dc61c42b02ed985c140fa5df799b722db481535c33a7af20c9ef777f4/_data",
                "Destination": "/dataVolume1",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "7d63ce25e13f6d382ac748acd1fcdeab7af505dc98ce95e54e4ab4e87a4c83d9",
                "Source": "/var/lib/docker/volumes/7d63ce25e13f6d382ac748acd1fcdeab7af505dc98ce95e54e4ab4e87a4c83d9/_data",
                "Destination": "/dataVolume2",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],