Resolved How to reclaim Docker's data disk space (devicemapper directory)

[Précurseur]

Hello,

I installed Plesk Obsidian on a new server (please note that I'm quite new to Plesk) and I just noticed that the directory
/var/lib/docker/devicemapper/devicemapper/data
has a size of about 100 GO. I don't use docker and I don't remember having configured anything related to this.
Is there a way to safely reclaims all that disk space or is it somehow required by Plesk ?

 

[IgorG]

Do you have installed Plesk docker extension?

 

[Précurseur]

Hello,
Thank you for your fast reply !
If you're talking about the paying extension "Docker" (/modules/catalog/index.php/catalog/package/docker), then it's not installed.
But I have a "Docker" entry in the sidebar menu in the "Server Management" section.
This page says: Docker Catalog at Localhost: No images are installed at the moment. You can install a Docker image from the catalog.

 

[IgorG]

Something wrong there. Looks like partially removed extension. Try to install Docker extension and then remove it.

 

[Précurseur]

Ok, thank you, the Docker menu entry is no more there. But this didn't remove the Docker's data.
Any safe way to remove that please ?

 

[IgorG]

Any safe way to remove that please ?

I think it is safe.

 

[Précurseur]

Thank you for your help IgorG.
So in: /var/lib/docker/devicemapper/devicemapper
I have :
- data: 100 Go
- metadata: 2 Go
You think it's ok to simply do:
rm -rf /var/lib/docker/devicemapper/devicemapper ?

 

[IgorG]

Before removing make sure that no running docker processes on your server with

# ps ax | grep docker

 

[Précurseur]

Here's the result of your command:
895 ? Ssl 0:03 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
11566 pts/1 R+ 0:00 grep docker

I really don't know where this could be from.

 

[IgorG]

I really don't know where this could be from.

I don't know too.

 

[Précurseur]

I don't know how docker works, so I you know a command to stop these processes or stop all "containers" (don't know if this is the right word) before I try to rm the data, please give it and the post can be closed.
If not I will search about that, thank you.

 

[IgorG]

Check that docker service is started with

# systemctl status docker

And stop it with

# systemctl stop docker

 

[Précurseur]

OK thank you for you help, I will try to remove these data without breaking something.
I would like to close this issue but I can't find the appropriate button (or maybe there is no such feature).
Thank you,

 

[MartainnZapien]

Hey thanks for the super helpful reply. I'm not sure how I missed that thread. I haven't quite mastered the search function on here. I think I'll pass with him this time around. If i want any further guideline we will contact you here Resolved - How to reclaim Docker's data disk space (devicemapper directory).