[LINUX] I checked the contents of docker volume

First, display the list of volumes

list.sh

$ docker volume ls
du667382djcn ・ ・ ・
hy66557738mj ・ ・ ・
examplevolume
examplevolume2

Random numbers like du6673 displayed here Volume may be automatically generated for some reason. When pulling a container, starting, etc. within my own recognition range The line is cut, the mount or the file in the image is directly tampered with, etc. I feel that it often happens for some reason. (If you have any experiences that it will be automatically generated at such times, I would be grateful if you could comment)

Mount the automatically generated volume and set up a test container

run.sh

$ docker run -itd --name testvolume -v du667382djcn:/du667382djcn busybox

As a command structure docker run -itd --name Container name here -v Volume name here: / Freely set the directory name inside the container when attaching a volume inside the container busybox (← image. Busybox is a lightweight Linux command Group image)

It will be shaped like.

Note) Note that an error will occur if the / slash is omitted.

Now to the volume directory in the container

exec.sh

$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
a23fd4z8ks2d        busybox             "sh"                8 seconds ago       Up 7 seconds                            testvolume

$ docker exec -it a23fd4z8ks2d /bin/ash
/ # ls -la
total 48
drwxr-xr-x    1 root     root          4096 Apr 10 03:19 .
drwxr-xr-x    1 root     root          4096 Apr 10 03:19 ..
-rwxr-xr-x    1 root     root             0 Apr 10 03:19 .dockerenv
drwxr-xr-x    2 root     root         12288 Jul 16  2019 bin
drwxr-xr-x    5 root     root           360 Apr 10 03:19 dev

drwxr-xr-x    2 root     root          4096 Nov 11 10:03 du667382djcn

drwxr-xr-x    1 root     root          4096 Apr 10 03:19 etc
drwxr-xr-x    2 nobody   nogroup       4096 Jul 16  2019 home
dr-xr-xr-x  190 root     root             0 Apr 10 03:19 proc
drwx------    1 root     root          4096 Apr 10 03:20 root
dr-xr-xr-x   13 root     root             0 Apr 10 03:19 sys
drwxrwxrwt    2 root     root          4096 Jul 16  2019 tmp
drwxr-xr-x    3 root     root          4096 Jul 16  2019 usr
drwxr-xr-x    4 root     root          4096 Jul 16  2019 var

$ls -la /du667382djcn

This will bring up a list of the mounted directories.

Unresolved questions

I tried the following method with reference to the information a while ago, but it didn't work.

error.sh

$ docker volume ls
du667382djcn ・ ・ ・
hy66557738mj ・ ・ ・
examplevolume
examplevolume2

$ docker volume inspect du667382djcn
[
    {
        "CreatedAt": "2017-11-11T10:１3:４５Z",
        "Driver": "local",
        "Labels": null,
        "Mountpoint": "/var/lib/docker/volumes/du667382djcn ・ ・ ・/_data",
        "Name": "du667382djcn ・ ・ ・",
        "Options": null,
        "Scope": "local"
    }
]

$ sudo ls -la /var/lib/docker/volumes/du667382djcn ・ ・ ・/_data
ls: /var/lib/docker/volumes/du667382djcn ・ ・ ・/_data: No such file or directory

It would be easier if this method could be done. I would appreciate it if you could comment on any of the above mistakes or similar practices.