Access .zfs snapshot from inside a jail

[cdbessig]

Hello,

I have set snapshot folder visibility to yes on a data set.

I then scheduled a periodic snapshot task to run on my dataset.

I have then created a jail and mounted the dataset as a mount inside the jail.

I then fire up the jail's ssh and navigate to the .zfs/snapshot folder and cannot access the snapshots.

Code:

root@rsnapshot:/mnt/DATA/.zfs/snapshot # ls -al
ls: auto-2021-04-18_00-00: Operation not permitted
ls: auto-2021-04-19_00-00: Operation not permitted
ls: auto-2021-04-20_00-00: Operation not permitted
total 1
dr-xr-xr-x+ 7 root  wheel  7 Apr 20 00:00 .
dr-xr-xr-x+ 3 root  wheel  3 Apr 17 11:52 ..
drwxr-xr-x  2 root  wheel  2 Apr 17 11:52 rsnapshot-manual-2021-04-17_11-54
drwxr-xr-x  2 root  wheel  7 Apr 17 11:56 rsnapshot-manual-2021-04-17_11-57---2

What would I need to do to get the snapshot folders accessible inside the jail for read only access?

 

[bozho]

Hi,

I've been looking into the same thing recently and hit this same problem. I'm on TrueNAS-12.0-U4 .

Curiously, after I've created a new snapshot and do an ls -al /path/to/dataset/.zfs/snapshot (just ls does not help) from the base OS, I can access the new snapshot from jail.

Could this be bug?

 

[cdbessig]

I forget where (clearly not in this thread), someone pointed to a freebsd bug report on this issue and claimed that the issue should be reported upstream to freebsd so it trickles down to true nas.

Unfortunately, I did not have the freebsd experience or time to setup a bare freebsd server and test the xfs implementation to confirm it exist in freebsd.

I instead opted to go with a virtual machine instead of a jail.