1.\" 2.\" CDDL HEADER START 3.\" 4.\" The contents of this file are subject to the terms of the 5.\" Common Development and Distribution License (the "License"). 6.\" You may not use this file except in compliance with the License. 7.\" 8.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9.\" or http://www.opensolaris.org/os/licensing. 10.\" See the License for the specific language governing permissions 11.\" and limitations under the License. 12.\" 13.\" When distributing Covered Code, include this CDDL HEADER in each 14.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15.\" If applicable, add the following below this CDDL HEADER, with the 16.\" fields enclosed by brackets "[]" replaced with your own identifying 17.\" information: Portions Copyright [yyyy] [name of copyright owner] 18.\" 19.\" CDDL HEADER END 20.\" 21.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved. 22.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org> 23.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved. 24.\" Copyright (c) 2011, Pawel Jakub Dawidek <pjd@FreeBSD.org> 25.\" Copyright (c) 2012, Glen Barber <gjb@FreeBSD.org> 26.\" Copyright (c) 2012, Bryan Drewery <bdrewery@FreeBSD.org> 27.\" Copyright (c) 2013, Steven Hartland <smh@FreeBSD.org> 28.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 29.\" Copyright (c) 2014, Joyent, Inc. All rights reserved. 30.\" Copyright (c) 2014 by Adam Stevko. All rights reserved. 31.\" Copyright (c) 2014 Integros [integros.com] 32.\" Copyright (c) 2014, Xin LI <delphij@FreeBSD.org> 33.\" Copyright (c) 2014-2015, The FreeBSD Foundation, All Rights Reserved. 34.\" Copyright (c) 2016 Nexenta Systems, Inc. All Rights Reserved. 35.\" Copyright 2019 Richard Laager. All rights reserved. 36.\" Copyright 2018 Nexenta Systems, Inc. 37.\" Copyright 2019 Joyent, Inc. 38.\" 39.Dd May 27, 2021 40.Dt ZFS-JAIL 8 41.Os 42. 43.Sh NAME 44.Nm zfs-jail 45.Nd attach or detach ZFS filesystem from FreeBSD jail 46.Sh SYNOPSIS 47.Nm zfs Cm jail 48.Ar jailid Ns | Ns Ar jailname 49.Ar filesystem 50.Nm zfs Cm unjail 51.Ar jailid Ns | Ns Ar jailname 52.Ar filesystem 53. 54.Sh DESCRIPTION 55.Bl -tag -width "" 56.It Xo 57.Nm zfs 58.Cm jail 59.Ar jailid Ns | Ns Ar jailname 60.Ar filesystem 61.Xc 62Attach the specified 63.Ar filesystem 64to the jail identified by JID 65.Ar jailid 66or name 67.Ar jailname . 68From now on this file system tree can be managed from within a jail if the 69.Sy jailed 70property has been set. 71To use this functionality, the jail needs the 72.Sy allow.mount 73and 74.Sy allow.mount.zfs 75parameters set to 76.Sy 1 77and the 78.Sy enforce_statfs 79parameter set to a value lower than 80.Sy 2 . 81.Pp 82You cannot attach a jailed dataset's children to another jail. 83You can also not attach the root file system 84of the jail or any dataset which needs to be mounted before the zfs rc script 85is run inside the jail, as it would be attached unmounted until it is 86mounted from the rc script inside the jail. 87.Pp 88To allow management of the dataset from within a jail, the 89.Sy jailed 90property has to be set and the jail needs access to the 91.Pa /dev/zfs 92device. 93The 94.Sy quota 95property cannot be changed from within a jail. 96.Pp 97After a dataset is attached to a jail and the 98.Sy jailed 99property is set, a jailed file system cannot be mounted outside the jail, 100since the jail administrator might have set the mount point to an unacceptable value. 101.Pp 102See 103.Xr jail 8 104for more information on managing jails. 105Jails are a 106.Fx 107feature and are not relevant on other platforms. 108.It Xo 109.Nm zfs 110.Cm unjail 111.Ar jailid Ns | Ns Ar jailname 112.Ar filesystem 113.Xc 114Detaches the specified 115.Ar filesystem 116from the jail identified by JID 117.Ar jailid 118or name 119.Ar jailname . 120.El 121.Sh SEE ALSO 122.Xr jail 8 , 123.Xr zfsprops 8 124