I have a Proxmox LXC container with Nextcloud. The default data directory in Nextcloud requires the owner to be www-data with the default uid and gid of 33. I am using the following
Proxmox
Mount Point: /mnt/sdc
Drive Path: /dev/mapper/sdc
UID: 33
GID: 33
Filesystem: ZFS
Drive FS: LUKS/exfat
Nextcloud LXC
Data Directory: /mnt/myuser/files
Container ID: 102
I modified the 3 files inside Proxmox that I need in order to create a user passthrough
/etc/pve/lxc/102.conf
underprivlaged: 1
lxc.idmap: u 0 100000 33
lxc.idmap: g 0 100000 33
lxc.idmap: u 33 33 1
lxc.idmap: g 33 33 1
lxc.idmap: u 34 100034 65502
lxc.idmap: g 34 100034 65502
lxc.cgroup.devices.allow = b 8:32 rwm
lxc.mount.entry = /dev/mapper/sdc /mnt/sdc none bind,create=file,uid=33,gid=33 0 0
mp0: /mnt/sdc,mp=/mnt/myuser/files
/etc/subuid
root:100000:65536
root:33:1
/etc/subgid
root:100000:65536
root:33:1
Proxmox Commands (chown mountpoint for external storage)
chown -R 100033:100033 /mnt/sdc
mount /dev/mapper/sdc /mnt/sdc
Keep in mind I did all this BEFORE creating the www-data user in the Nextcloud LXC container. I only added the last 3 bind mount entries in my LXC config after I created the Nextcloud user in the front end web interface and permanently deleted the default files inside the Nextcloud data directory. I ensured it was empty before adding the mount.
I am using a ZFS filesystem. I am trying to create a passthrough to an LXC container. As mentioned in my previous thread, I am using Nextcloud so I needed to create a user passthrough as well. I got the user ID mapping passthrough working on the mounted directory working just fine. Everything is owned by www-data:www-data as intended. The mountpoint on Proxmox /mnt/sdc is also adapting the name www-data when chowning the appropriate ID (33:33). However, when I mount the drive, Nextcloud stops uploading files and I think I know why. I can not write to the drive. I noticed this was because whenever I mount the drive in proxmox, the Proxmox mount directory ownership changes back to root:root. Again, I am using ZFS so I ran the following commands to prevent this
umount /mnt/sdc;
zfs create -o mountpoint=/mnt/sdc /rpool/sdc;
zfs mount rpool/sdc;
chown 33:33 /mnt/sdc;
mount /dev/mapper/sdc /mnt/sdc;
It made no difference. How can I ensure my mounted drive respects the uid:gid ID ownership on the hypervisor and the passthrough?
