[SOLVED] Proxmox: How to assign diskspace (a folder) on a new hdd to a docker

moddy@feddit.de to Selfhosted@lemmy.world – 31 points –

Hi. I switched from a few SBCs to a proxmox-server and i really enjoy it. Now - after playing a little bit around - i plugged an external 8tb-hdd on my server mainly for backups. I followed this tutorial: https://ostechnix.com/add-external-usb-storage-to-proxmox/

Next step is to use urbackup. I created a folder /urbackup on the 8tb-hdd and now i would like to assign this folder to the urbackup-docker but i do not understand how to do this.

What "content" do i have to choose for this case and how can i assign the folder to the docker?

Important EDIT: I forgot to mention that i do not use a VM but LXC!

SOLUTION in this case is pretty simple: https://pve.proxmox.com/wiki/Linux_Container#_bind_mount_points

For example, to make the directory /mnt/bindmounts/shared accessible in the container with ID 100 under the path /shared, add a configuration line such as:

mp0: /mnt/bindmounts/shared,mp=/shared

into /etc/pve/lxc/100.conf.

Or alternatively use the pct tool:

pct set 100 -mp0 /mnt/bindmounts/shared,mp=/shared

to achieve the same result.

Thanks a lot for your help!

5

Are you trying to add it to a VM or a CT?

You can bind mount a folder on the host into a CT: https://pve.proxmox.com/wiki/Linux_Container#_bind_mount_points

For a VM you have to either add a virtual disk image on the external drive (will be fixed size, cannot use existing data), or share the folder on the host via NFS and mount it in the VM with the NFS client.

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Are you running docker on the PVE host? Or within a LXC container or VM?

Note that running docker on the PVE host is not recommended as this can cause networking problems for both docker and the host+guests

If you are running docker in a VM as is recommended then pass thru the USB drive to that VM, it will act as if it was plugged directly into the VM.

Ah, ok, i see. In the future i always have to write about the way i host the services on the proxmox. I use onlx LXC's. Also docker is in a LXC.

Is this urbackup-docker in a VM or an LXC? If the latter, you don’t need to add it in storage at all; you can bind mount the folder and use it directly. Here’s some info on that. If it’s in a VM and you want to use the directory directly (as in not just make a disk image inside the directory to pass as a block device) you’ll have to do some file sharing to the VM.