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Add the 'zfs jail/unjail' subcommands along with the relevant documentation from FreeBSD. This feature is not supported on Linux and still requires the match kernel ioctls which will be included when the FreeBSD platform code is integrated. Reviewed-by: Jorgen Lundman <lundman@lundman.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matt Macy <mmacy@FreeBSD.org> Signed-off-by: Ryan Moeller <ryan@ixsystems.com> Closes #9686
120 lines
3.7 KiB
Groff
120 lines
3.7 KiB
Groff
.\"
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.\" CDDL HEADER START
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.\" Common Development and Distribution License (the "License").
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" CDDL HEADER END
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.\"
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.\"
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.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
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.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
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.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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.\" Copyright (c) 2011, Pawel Jakub Dawidek <pjd@FreeBSD.org>
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.\" Copyright (c) 2012, Glen Barber <gjb@FreeBSD.org>
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.\" Copyright (c) 2012, Bryan Drewery <bdrewery@FreeBSD.org>
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.\" Copyright (c) 2013, Steven Hartland <smh@FreeBSD.org>
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.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
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.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
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.\" Copyright (c) 2014 Integros [integros.com]
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.\" Copyright (c) 2014, Xin LI <delphij@FreeBSD.org>
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.\" Copyright (c) 2014-2015, The FreeBSD Foundation, All Rights Reserved.
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.\" Copyright (c) 2016 Nexenta Systems, Inc. All Rights Reserved.
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.\" Copyright 2019 Richard Laager. All rights reserved.
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.\" Copyright 2018 Nexenta Systems, Inc.
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.\" Copyright 2019 Joyent, Inc.
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.\"
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.Dd December 9, 2019
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.Dt ZFS-JAIL 8
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.Os FreeBSD
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.Sh NAME
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.Nm zfs Ns Pf - Cm jail
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.Nd Attaches and detaches ZFS filesystems from FreeBSD jails.
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.No A Tn ZFS
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dataset can be attached to a jail by using the
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.Qq Nm Cm jail
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subcommand. You cannot attach a dataset to one jail and the children of the
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same dataset to another jail. You can also not attach the root file system
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of the jail or any dataset which needs to be mounted before the zfs rc script
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is run inside the jail, as it would be attached unmounted until it is
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mounted from the rc script inside the jail. To allow management of the
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dataset from within a jail, the
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.Sy jailed
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property has to be set and the jail needs access to the
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.Pa /dev/zfs
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device. The
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.Sy quota
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property cannot be changed from within a jail. See
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.Xr jail 8
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for information on how to allow mounting
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.Tn ZFS
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datasets from within a jail.
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.Pp
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.No A Tn ZFS
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dataset can be detached from a jail using the
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.Qq Nm Cm unjail
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subcommand.
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.Pp
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After a dataset is attached to a jail and the jailed property is set, a jailed
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file system cannot be mounted outside the jail, since the jail administrator
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might have set the mount point to an unacceptable value.
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.Sh SYNOPSIS
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.Nm
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.Cm jail
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.Ar jailid Ns | Ns Ar jailname filesystem
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.Nm
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.Cm unjail
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.Ar jailid Ns | Ns Ar jailname filesystem
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.Sh DESCRIPTION
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.Bl -tag -width ""
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.It Xo
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.Nm
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.Cm jail
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.Ar jailid filesystem
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.Xc
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.Pp
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Attaches the specified
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.Ar filesystem
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to the jail identified by JID
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.Ar jailid .
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From now on this file system tree can be managed from within a jail if the
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.Sy jailed
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property has been set. To use this functuinality, the jail needs the
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.Va allow.mount
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and
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.Va allow.mount.zfs
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parameters set to 1 and the
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.Va enforce_statfs
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parameter set to a value lower than 2.
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.Pp
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See
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.Xr jail 8
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for more information on managing jails and configuring the parameters above.
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.It Xo
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.Nm
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.Cm unjail
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.Ar jailid filesystem
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.Xc
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.Pp
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Detaches the specified
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.Ar filesystem
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from the jail identified by JID
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.Ar jailid .
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.El
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.Sh SEE ALSO
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.Xr jail 8 ,
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.Xr zfsprops 8
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