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Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
144 lines
5.1 KiB
Groff
144 lines
5.1 KiB
Groff
.\" SPDX-License-Identifier: CDDL-1.0
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.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or https://opensource.org/licenses/CDDL-1.0.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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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) 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 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 March 16, 2022
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.Dt ZFS-SNAPSHOT 8
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.Os
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.
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.Sh NAME
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.Nm zfs-snapshot
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.Nd create snapshots of ZFS datasets
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.Sh SYNOPSIS
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.Nm zfs
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.Cm snapshot
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.Op Fl r
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.Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
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.Ar dataset Ns @ Ns Ar snapname Ns …
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.
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.Sh DESCRIPTION
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Creates a snapshot of a dataset or multiple snapshots of different
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datasets.
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.Pp
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Snapshots are created atomically.
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That is, a snapshot is a consistent image of a dataset at a specific
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point in time; it includes all modifications to the dataset made by
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system calls that have successfully completed before that point in time.
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Recursive snapshots created through the
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.Fl r
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option are all created at the same time.
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.Pp
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.Nm zfs Cm snap
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can be used as an alias for
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.Nm zfs Cm snapshot .
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.Pp
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See the
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.Sx Snapshots
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section of
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.Xr zfsconcepts 7
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for details.
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.Bl -tag -width "-o"
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.It Fl o Ar property Ns = Ns Ar value
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Set the specified property; see
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.Nm zfs Cm create
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for details.
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.It Fl r
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Recursively create snapshots of all descendent datasets
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.El
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.
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.Sh EXAMPLES
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.\" These are, respectively, examples 2, 3, 10, 15 from zfs.8
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.\" Make sure to update them bidirectionally
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.Ss Example 1 : No Creating a ZFS Snapshot
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The following command creates a snapshot named
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.Ar yesterday .
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This snapshot is mounted on demand in the
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.Pa .zfs/snapshot
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directory at the root of the
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.Ar pool/home/bob
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file system.
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.Dl # Nm zfs Cm snapshot Ar pool/home/bob Ns @ Ns Ar yesterday
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.
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.Ss Example 2 : No Creating and Destroying Multiple Snapshots
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The following command creates snapshots named
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.Ar yesterday No of Ar pool/home
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and all of its descendent file systems.
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Each snapshot is mounted on demand in the
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.Pa .zfs/snapshot
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directory at the root of its file system.
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The second command destroys the newly created snapshots.
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.Dl # Nm zfs Cm snapshot Fl r Ar pool/home Ns @ Ns Ar yesterday
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.Dl # Nm zfs Cm destroy Fl r Ar pool/home Ns @ Ns Ar yesterday
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.
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.Ss Example 3 : No Promoting a ZFS Clone
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The following commands illustrate how to test out changes to a file system, and
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then replace the original file system with the changed one, using clones, clone
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promotion, and renaming:
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.Bd -literal -compact -offset Ds
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.No # Nm zfs Cm create Ar pool/project/production
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populate /pool/project/production with data
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.No # Nm zfs Cm snapshot Ar pool/project/production Ns @ Ns Ar today
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.No # Nm zfs Cm clone Ar pool/project/production@today pool/project/beta
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make changes to /pool/project/beta and test them
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.No # Nm zfs Cm promote Ar pool/project/beta
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.No # Nm zfs Cm rename Ar pool/project/production pool/project/legacy
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.No # Nm zfs Cm rename Ar pool/project/beta pool/project/production
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once the legacy version is no longer needed, it can be destroyed
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.No # Nm zfs Cm destroy Ar pool/project/legacy
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.Ed
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.
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.Ss Example 4 : No Performing a Rolling Snapshot
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The following example shows how to maintain a history of snapshots with a
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consistent naming scheme.
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To keep a week's worth of snapshots, the user destroys the oldest snapshot,
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renames the remaining snapshots, and then creates a new snapshot, as follows:
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.Bd -literal -compact -offset Ds
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.No # Nm zfs Cm destroy Fl r Ar pool/users@7daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@6daysago No @ Ns Ar 7daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@5daysago No @ Ns Ar 6daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@4daysago No @ Ns Ar 5daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@3daysago No @ Ns Ar 4daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@2daysago No @ Ns Ar 3daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@yesterday No @ Ns Ar 2daysago
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.No # Nm zfs Cm rename Fl r Ar pool/users@today No @ Ns Ar yesterday
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.No # Nm zfs Cm snapshot Fl r Ar pool/users Ns @ Ns Ar today
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.Ed
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.
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.Sh SEE ALSO
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.Xr zfs-bookmark 8 ,
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.Xr zfs-clone 8 ,
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.Xr zfs-destroy 8 ,
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.Xr zfs-diff 8 ,
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.Xr zfs-hold 8 ,
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.Xr zfs-rename 8 ,
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.Xr zfs-rollback 8 ,
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.Xr zfs-send 8
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