mount cephfs error

[mortenm12]

Hey I get an error when I try to mount cephfs on one of my LXC.

modprobe: FATAL: Module ceph not found in directory /lib/modules/6.14.11-3-pve
failed to load ceph kernel module (1)
mount error: ceph filesystem not supported by the system

I have followed the step from ceph documentation https://docs.ceph.com/en/reef/cephfs/mount-prerequisites/#

I have tryes to update and upgrade thehost and the container but without succes

 

[leesteken]

You cannot do mounts inside a container, since they share the kernel and are unprivileged (which is a good thing!). Do it from the Proxmox host (using a different mount point) and use a mountpoint for the container. Lots of threads about this but they are usually about mounting NFS or SMB/CIFS instead of CephFS.

EDIT: Here is a similar thread: https://forum.proxmox.com/threads/l...hfs-mountpoints-fail-to-start-at-boot.157306/

 

[mortenm12]

okay, it makes a little sense, but I wanted to containers to share am ount or some kind of space for shared files, any idea how to solve this?

 

[leesteken]

okay, it makes a little sense,

There is not real root account on unprivileged containers for security. And you need to be root on the kernel to mount filesystems. Therefore, you need to do stuff that requires (actual) root on the host/nodes itself.

but I wanted to containers to share am ount or some kind of space for shared files, any idea how to solve this?

Mount your CephFS on each node using the same path (on each node). Then add that path as a mount-point to each container to give the container access to the shared space: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#pct_mount_points