Recursive Mount

[nhatvoone]

Is there a way to mount zfs directories recursively?

It currently does not mount nested ZFS datasets, only the parent dataset, and the manual doesn't have that option

https://pve.proxmox.com/wiki/LXC_Bind_Mounts

 

[wbumiller]

This is currently not supported directly.

 

[LnxBil]

I needed to bind-mount (with mpXX) everything I needed inside the LXC container to achieve what you want to do.

Another trick would be to alter the mountpoint to your lxc container, but then it is hardcoded to that VMID, but it works, too.

 

[drumo46]

@wbumiller It would be nice to get support for this

@LnxBil Thanks for the great hack, it works if I set my zfs mountpoints to be under the container's rootfs zfs mountpoint.
The only caveat is that the additional zfs can't be mounted before the container starts. It has to be mounted afterwards.

 

[LnxBil]

@wbumiller It would be nice to get support for this

Indeed.


Nowadays, you have up to 32 bind mounts in your configuration and I switched to manually putting everything in there. The configuration gets quite long, but it solved all problems ... yet I will run out of configurable mountpoints soon:

root@proxmox ~ > grep mp /etc/pve/lxc/1008.conf
mp0: /zpool/bilder,mp=/bilder
mp1: /zpool/other,mp=/other
mp10: /zpool/bilder/2003,mp=/bilder/2003
mp11: /zpool/bilder/2004,mp=/bilder/2004
mp12: /zpool/bilder/2005,mp=/bilder/2005
mp13: /zpool/bilder/2006,mp=/bilder/2006
mp14: /zpool/bilder/2007,mp=/bilder/2007
mp15: /zpool/bilder/2008,mp=/bilder/2008
mp16: /zpool/bilder/2009,mp=/bilder/2009
mp17: /zpool/bilder/2010,mp=/bilder/2010
mp18: /zpool/bilder/2011,mp=/bilder/2011
mp19: /zpool/bilder/2012,mp=/bilder/2012
mp2: /zpool/virtual_machines/VirtualBox,mp=/virtual_machines/VirtualBox
mp20: /zpool/bilder/2013,mp=/bilder/2013
mp21: /zpool/bilder/2014,mp=/bilder/2014
mp22: /zpool/bilder/2015,mp=/bilder/2015
mp23: /zpool/bilder/2016,mp=/bilder/2016
mp24: /zpool/bilder/2017,mp=/bilder/2017
mp25: /zpool/bilder/astronomy,mp=/bilder/astronomy
mp26: /zpool/filme/vdr,mp=/media
mp28: /zpool/bilder/Sonstiges,mp=/bilder/Sonstiges
mp29: /zpool/bilder/Noch_Sortieren,mp=/bilder/Noch_Sortieren
mp3: /zpool/virtual_machines/ova_templates,mp=/virtual_machines/ova_templates
mp30: /zpool/bilder/2019,mp=/bilder/2019
mp31: /zpool/bilder/2018,mp=/bilder/2018
mp4: /zpool/virtual_machines/installationsdaten,mp=/virtual_machines/installationsdaten
mp5: /zpool/bilder/198X,mp=/bilder/198X
mp6: /zpool/bilder/1992,mp=/bilder/1992
mp7: /zpool/bilder/2000,mp=/bilder/2000
mp8: /zpool/bilder/2001,mp=/bilder/2001
mp9: /zpool/bilder/2002,mp=/bilder/2002

 

[sienar]

Running into this issue myself. Had it happening in an unimportant container and didn't realize what was happening. Rebuilt a folder structure into multiple nested datasets and now the container that had the parent dataset mounted in and WAS working fine in is now garbage. Going to have to put in tons of mount points in the LXC config. How is something this basic not supported? Especially after being reported years ago...

 

[nxet]

I'd be interested in this feature as well

 

[harvie]

Recursive bind mount would make lot of sense IMO. Please raise a feature request at https://bugzilla.proxmox.com/

 

[mer]

Through a day of testing I was able to get the recursive bind mount working for nested zfs datasets by using the following mount entry line in the containers config file /etc/pve/lxc/<vmid>.conf. I'm still setting up the container but I don's see any performance or stability issues in the limited testing I've done so far.

lxc.mount.entry: /tank/dataset mnt/dataset none rbind,create=dir 0 0

tank is my zpool and dataset is a zfs dataset with other zfs datasets under it mount in the container as /mnt/dataset.

When I was using just bind in the mount entry, the lxc container was unable to start complaining it did not have permissions to mount /tank/dataset although other datasets that did not have nested datasets were able to mount in the container fine. With the rbind in the mount entry, it seems to be ok with the nested datasets and the structure including any child datasets are presented and accessible from within the container.

my proxmox version is a little out of date so hopefully this works on newer releases. pve-manager/6.1-8/806edfe1 (running kernel: 5.3.18-3-pve)

 

[LnxBil]

Recursive bind mount would make lot of sense IMO. Please raise a feature request at https://bugzilla.proxmox.com/

Already done, still in review.

 

[Clete2]

Did this ever get merged? I'd love to have the feature.