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I have a number of ZFS sub-filesystems (so that I can granularly manage snapshots and ZFS options) like so:

tank/media
tank/media/pictures
tank/media/pictures/photos
tank/media/movies
tank/media/music
tank/media/documents
tank/media/documents/public

I am running Debian GNU/Linux 8.6 (jessie) with ZFS-on-Linux, kernel 4.4.19-1-pve. My goal is to share the parent ZFS filesystem (tank/media) with a LXC container via a bind mount and have the sub-filesystems be accessible.

If I bind mount tank/media inside the container, then the sub ZFS filesystems (E.G. tank/media/pictures) do not show up. I need to mount --make-rshared tank/media in order for the sub-mounts to also appear.

How can I make ZFS sub filesystems be mounted make-rshared by default using ZFS on Linux?

1 Answer 1

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I have found that mounting with the rbind (rather than bind) option in the lxc mount line solves the issue (syntax for proxmox):

lxc.mount.entry: /tank/media media none rbind,create=dir,optional 0 0

Going off the RedHat documentation on sharing mounts, rbind achieves replication of mounts on the source in the bound directory (which is what we need), the difference being make-rshared allows a mount on the bind to be reflected in the source.

Just came across the issue myself, and this is the only relevant result on google, so I thought it was appropriate to give an answer despite the age of the question.

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  • Had to wait until the next reboot of the server, but I tried this solution and it worked perfectly. Thank you!!!
    – Josh
    Commented Jul 23, 2017 at 19:44

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