Date: Wed, 15 May 2019 14:06:04 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-questions@freebsd.org Subject: Re: ZFS Backup on remote FreeBSD system Message-ID: <6d1d726f-8d97-d750-2652-314d2e6b627a@denninger.net> In-Reply-To: <87v9ybv938.fsf@x230.onfire.org> References: <87v9ybv938.fsf@x230.onfire.org>
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On 5/15/2019 13:58, Christian Barthel wrote:
> Hello,
> I am using FreeBSD on my notebook and send ZFS
> snapshots over to a second FreeBSD machine. The full
> command for doing an initial (full) backup is:=20
>
> zfs send -R zroot/usr/home@${DTIME} | \
> ssh ${user}@${HOST} zfs recv -Fdvu zroot/host1
>
> According to zfs(1), all properties and descendant file
> systems are copied as well (and of course, this works
> as described). However, it also sets the mountpoint
> and canmount option and after a reboot of the backup
> host, ZFS mounts those file systems. I am planning to
> have multiple hosts beneath zroot i.e. zroot/host1,
> zroot/host2, ... and because of that, I would prefer
> not automounting those file systems or mount them below
> /zroot/hostX/ (*). Is this possible somehow i.e. is
> there a simple way to do that? Anyone doing something
> similar?
Set "canmount=3Dnoauto" on the received filesystem before you export the
pool it is received to or reboot the machine (which will otherwise mount
all declared filesystems that have mountpoints and "canmount=3Dyes" set.
> Should I set each mountpoint on the backup system
> manually?
You can set "mountpoint=3Dnone" too if you want once it has been received=
which will remove the mountpoint from the zfs filesystem entirely;
either will work fine.
> Will this property change when sending an incremental
> backup with -Ri or will it be reset again? In that
> case, it would be necessary to set it every time after
> syncing.
It will not be reset on an incremental send so once you change it on the
receiving end it will remain "sticky".=C2=A0 If you want to keep track of=
where it's supposed to be mounted on the other end "canmount=3Dnoauto"
will preserve the actual setting but not act on it.
I use this paradigm regularly here both locally (to a "backup" pool) and
for remote systems that are sync'd to a backup location
("pool/archive/Backups") on my primary server.
You only need to set the canmount property once when the initial
send/receive is done.
--=20
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
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