FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/man/man8/zfs-unjail.8

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    .Dd May 27, 2021
    .Dt ZFS-JAIL 8
    .Os
    .
    .Sh NAME
    .Nm zfs-jail
    .Nd attach or detach ZFS filesystem from FreeBSD jail
    .Sh SYNOPSIS
    .Nm zfs Cm jail
    .Ar jailid Ns | Ns Ar jailname
    .Ar filesystem
    .Nm zfs Cm unjail
    .Ar jailid Ns | Ns Ar jailname
    .Ar filesystem
    .
    .Sh DESCRIPTION
    .Bl -tag -width ""
    .It Xo
    .Nm zfs
    .Cm jail
    .Ar jailid Ns | Ns Ar jailname
    .Ar filesystem
    .Xc
    Attach the specified
    .Ar filesystem
    to the jail identified by JID
    .Ar jailid
    or name
    .Ar jailname .
    From now on this file system tree can be managed from within a jail if the
    .Sy jailed
    property has been set.
    To use this functionality, the jail needs the
    .Sy allow.mount
    and
    .Sy allow.mount.zfs
    parameters set to
    .Sy 1
    and the
    .Sy enforce_statfs
    parameter set to a value lower than
    .Sy 2 .
    .Pp
    You cannot attach a jailed dataset's children to another jail.
    You can also not attach the root file system
    of the jail or any dataset which needs to be mounted before the zfs rc script
    is run inside the jail, as it would be attached unmounted until it is
    mounted from the rc script inside the jail.
    .Pp
    To allow management of the dataset from within a jail, the
    .Sy jailed
    property has to be set and the jail needs access to the
    .Pa /dev/zfs
    device.
    The
    .Sy quota
    property cannot be changed from within a jail.
    .Pp
    After a dataset is attached to a jail and the
    .Sy jailed
    property is set, a jailed file system cannot be mounted outside the jail,
   since the jail administrator might have set the mount point to an unacceptable
   value.
   .Pp
   See
   .Xr jail 8
   for more information on managing jails.
   Jails are a
   .Fx
   feature and are not relevant on other platforms.
   .It Xo
   .Nm zfs
   .Cm unjail
   .Ar jailid Ns | Ns Ar jailname
   .Ar filesystem
   .Xc
   Detaches the specified
   .Ar filesystem
   from the jail identified by JID
   .Ar jailid
   or name
   .Ar jailname .
   .El
   .Sh SEE ALSO
   .Xr zfsprops 7 ,
   .Xr jail 8

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