Move docker /var/lib/docker folder on external drive

Instead of linking, i tried editing the daemon.json file with:

{

"data-root": "/srv/dev-disk-by-label-HC/DockerBasePath/docker",

"storage-driver": "overlay2"

}

If i try: " docker info | grep 'Docker Root Dir' " the output is "Docker Root Dir: /srv/dev-disk-by-label-HC/DockerBasePath/docker "

So the path is ok, so why i do not see anything into OMV Docker?

Anyway i think that the link is backwards, it should be ln -s /var/lib/docker /new/path and not ln -s /new/path /var/lib/docker. Right?

Did you properly copy all the files and directories from /var/lib/docker to /srv/dev-disk-by-label-HC/DockerBasePath/docker ?

If you didn't properly copy them, then docker won't see them.

Zitat von gderf

Did you properly copy all the files and directories from /var/lib/docker to /srv/dev-disk-by-label-HC/DockerBasePath/docker ?

If you didn't properly copy them, then docker won't see them.

I think so, did it several times. What command do you suggest? So i can try right now.

Could be the difference of file systems? Microsd is btrfs and HD is ext4.

EDIT: Yep, it was the different filesystem. Writing here so it can help someone else. You can't move docker base path on different filesystems.

I did originally ln -s /sharedfolders/AppData/data/docker /var/lib/docker but in fact it wont work this way docker has to be a symlink outside of a share folder I put it directly on the root of my disk

the only problem I I am using OMV4 and do not know how to connect it with portainer to uprade to OMV5

Zitat von Nefertiti

I did originally ln -s /sharedfolders/AppData/data/docker /var/lib/docker but in fact it wont work this way docker has to be a symlink outside of a share folder I put it directly on the root of my disk

the only problem I I am using OMV4 and do not know how to connect it with portainer to uprade to OMV5

Maybe you should have used the complete absolute path of the disk/directory instead of the "sharedfolder"? For example /srv/dev-disk-by-label-etc.

Anyway i do not know if the symlink works if the directories are on different filesystems, if this is your case.

Only thing i can notice is that you used "/sharedfolders/AppData/data/docker" the image shows a second docker dir nested into the first docker dir. Maybe you have to fix that?

Zitat von steakhutzeee

Maybe you should have used the complete absolute path of the disk/directory instead of the "sharedfolder"? For example /srv/dev-disk-by-label-etc.

Anyway i do not know if the symlink works if the directories are on different filesystems, if this is your case.

Only thing i can notice is that you used "/sharedfolders/AppData/data/docker" the image shows a second docker dir nested into the first docker dir. Maybe you have to fix that?

I am aware of this i got an extra docker folder but the link goes to the right one so it is working.

What's the output for ls -asl /var/lib/docker ?

What you mean for "the only problem I I am using OMV4 and do not know how to connect it with portainer to uprade to OMV5"?

Portainer is the only container running?

Well on omv 4 I am not using portainer, see there my first test trying to upgrade to omv5 RE: Reconnecting with my existing docker data and portainer not working

- like I said I got an extra top docker folder not sure how to delete it without loosing the real nested bottom folder docker! so since it is woking like this for a long time I never took care of this!

ls -asl /var/lib/docker

0 lrwxrwxrwx 1 root root 39 Nov 2 11:50 /var/lib/docker -> /srv/dev-disk-by-label-WD_10TB_1/docker

Strange, you have symlink /var/lib/docker -> /srv/dev-disk-by-label-WD_10TB_1/docker

but it does not point to the nested docker dir. You say the containers there are working as intended?

You are right it supposed to be dev-disk-by-label-WD_10TB_1/docker/docker but I changed before posting for simplification and I forgot about it yes it always worked as

root@rockpro64:~# ls -asl /var/lib/docker

0 lrwxrwxrwx 1 root root 46 Mar 27 23:16 /var/lib/docker -> /srv/dev-disk-by-label-WD_10TB_1/docker/docker

root@rockpro64:~#

I did not noticed since my Appdata are still in a share folder so I had to try to play a movie to realize the issue

steakhutzeee Are you using OMV 5, if yes how did you configure portainer? with Docker on external?

I'm on OMV 4, changed the docker base path editing the damon.json file for docker. To now i switched over docker-compose to create my containers, I use Portainer only for quick visual info. I've installed it with docker-compose.