Date: Sat, 18 Nov 2023 10:46:25 -0800 From: Mark Millard <marklmi@yahoo.com> To: rick.macklem@gmail.com, Current FreeBSD <freebsd-current@freebsd.org> Subject: Re: NFS exports of ZFS snapshots broken Message-ID: <4D7CDA6F-F92D-4A36-B4B6-1D6A87FD1E3F@yahoo.com> References: <4D7CDA6F-F92D-4A36-B4B6-1D6A87FD1E3F.ref@yahoo.com>
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Rick Macklem <rick.macklem_at_gmail.com> wrote on
Date: Sat, 18 Nov 2023 16:09:34 UTC:
> . . .
> I will try and get a test setup going here, which leads me to..
> how do I create a ZFS snapshot? (I do have a simple ZFS pool running
> on a test machine, but I've never done a snapshot.)
> . . .
There is: "man zfs-snapshot" for "zfs snapshot" commands.
I mention this in part because it references also using "zfs promote"
to swap around the status of what is a snapshot vs. what is not.
There is also the man page, accessible via: "man zfs-promote" .=20
man zfs-snapshot also mentions destroying snapshots via "zfs destroy".
The man pages have examples, such as:
Example 1: Creating a ZFS Snapshot
The following command creates a snapshot named yesterday. This =
snapshot
is mounted on demand in the .zfs/snapshot directory at the root of =
the
pool/home/bob file system.
# zfs snapshot pool/home/bob@yesterday
Example 3 involves all 3 operations (snapshot, promote, destroy) that
I've referenced:
Example 3: Promoting a ZFS Clone
The following commands illustrate how to test out changes to a file
system, and then replace the original file system with the changed =
one,
using clones, clone promotion, and renaming:
# zfs create pool/project/production
populate /pool/project/production with data
# zfs snapshot pool/project/production@today
# zfs clone pool/project/production@today pool/project/beta
make changes to /pool/project/beta and test them
# zfs promote pool/project/beta
# zfs rename pool/project/production pool/project/legacy
# zfs rename pool/project/beta pool/project/production
once the legacy version is no longer needed, it can be =
destroyed
# zfs destroy pool/project/legacy
The description of "zfs promote" is:
DESCRIPTION
The zfs promote command makes it possible to destroy the dataset =
that the
clone was created from. The clone parent-child dependency =
relationship
is reversed, so that the origin dataset becomes a clone of the =
specified
dataset.
The snapshot that was cloned, and any snapshots previous to this
snapshot, are now owned by the promoted clone. The space they use =
moves
from the origin dataset to the promoted clone, so enough space must =
be
available to accommodate these snapshots. No new space is consumed =
by
this operation, but the space accounting is adjusted. The promoted =
clone
must not have any conflicting snapshot names of its own. The zfs =
rename
subcommand can be used to rename any conflicting snapshots.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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