SOLVED zfs recv in jail: cannot receive new filesystem stream: invalid backup stream

[Berend de Boer]

I'm trying to use zfs_autobackup in a jail. I get this error when doing a backup:

Code:

ssh bonobo 'zfs send tank/home/berend@offsite1-20210930111614' | \
  zfs recv -u -v -s home/iocage/jails/autobackup-2021-09-30/data/tank/home/berend

cannot receive new filesystem stream: invalid backup stream

The same command outside the jail works.

Is "zfs recv" not allowed in a jail? Is it possible to make it work in a jail?

 

[jgreco]

Might have something to do with security.jail.mount_zfs_allowed, perhaps try setting it to 1 to see if that changes the behaviour. Restart the jail.

 

[Berend de Boer]

Inside the jail "zfs list" and "zfs create" etc work fine.

 

[Berend de Boer]

Just tried that, and no, didn't help.

 

[Samuel Tai]

The jail properties are only the first step. You also have to move a dataset inside the jail. See https://openzfs.github.io/openzfs-docs/man/8/zfs-jail.8.html. Note, this is done from outside the jail.

 

[Berend de Boer]

The jail is created by iocage, and with the jail_zfs property, so the data dataset is jailed:

Code:

# zfs get all home/iocage/jails/autobackup-2021-09-30/data | grep jailed
home/iocage/jails/autobackup-2021-09-30/data  jailed                  on                      local

 

[Samuel Tai]

OK, looking at your original command, your problem is you're using the dataset path outside the jail inside the jail. Inside the jail, try using autobackup-2021-09-30/data/tank/home/berend, as the jail won't have visibility to the parent datasets which iocage created.

 

[Samuel Tai]

Alternatively, if you're outside the jail try to zfs recv into the jailed ZFS dataset, that also won't work, as ZFS will refuse to use a jailed dataset, as that's under the control of the jail, and not the parent system.

 

[Berend de Boer]

I don't think that's how it works. with zfs list I see the parent datasets clearly. Removing the parent datasets gives this error:

Code:

! Exception: Target path 'autobackup-2021-09-30/data' does not exist. Please create this dataset first.

 

[Berend de Boer]

Issue resolved: the problem is caused by jail FreeBSD 12 using zfs 1, while TrueNas host uses zfs 2. After copying the zfs binary and a few libraries from TrueNas host into jail, it worked. More details here.

 

[Samuel Tai]

Glad you figured it out.