Hi Mertol,
Yes, I'm using zfs send -i to just send the changes rather than the whole
thing. I'll have a think about your suggestion for deleting snapshots too,
that does sound like a good idea.
Unfortunately I won't be able to synchronise any applications with this script.
It's backing up a filestore used by VMware ESX, so could be holding any number
of machines. The aim of this is purely to give me a crash consistent backup of
those virtual machines just in case. We have other software in place for our
regular backups, this is our belt & braces disaster recovery copy :).
Ross
> Date: Fri, 26 Sep 2008 12:53:06 +0300> From: [EMAIL PROTECTED]> Subject: RE:
> [zfs-discuss] Scripting zfs send / receive> To: [EMAIL PROTECTED]> > Hi Ross
> ;> > I am no expert in scripting but I was a software engineer once :)> It's
> good to desing the script to be able to tolerate errors. > > Instead of
> sending the snapshot I'd recommending sending difference of snap> shots. >
> Also instead of deleting the oldest snapshot I recommend deleting all but>
> newest X number of snapshots. (incase for some reason script is unable to>
> delete a snap shot, it will clean them in the next run, as it will always>
> leave a fix number of snap shots alive) > > Also you may want your script
> talk to application running on the Fs before> and after snapshot to make the
> snapshot consistent. > > My 2 cents...> > Best regards> Mertol> > > > Mertol
> Ozyoney > Storage Practice - Sales Manager> > Sun Microsystems, TR> Istanbul
> TR> Phone +902123352200> Mobile +905339310752> Fax +902123352222> Email
> [EMAIL PROTECTED]> > > > -----Original Message-----> From: [EMAIL PROTECTED]>
> [mailto:[EMAIL PROTECTED] On Behalf Of Ross> Sent: Friday, September 26, 2008
> 12:43 PM> To: zfs-discuss@opensolaris.org> Subject: [zfs-discuss] Scripting
> zfs send / receive> > Hey folks,> > Is anybody able to help a Solaris
> scripting newbie with this? I want to put> together an automatic script to
> take snapshots on one system and send them> across to another. I've shown the
> manual process works, but only have a very> basic idea about how I'm going to
> automate this.> > My current thinking is that I want to put together a cron
> job that will work> along these lines:> > - Run every 15 mins> - take a new
> snapshot of the pool> - send the snapshot to the remote system with zfs send
> / receive and ssh.> (am I right in thinking I can get ssh to work with no
> password if I create a> public/private key pair?>
> http://www.go2linux.org/ssh-login-using-no-password)> - send an e-mail alert
> if zfs send / receive fails for any reason (with the> text of the failure
> message)> - send an e-mail alert if zfs send / receive takes longer than 15
> minutes> and clashes with the next attempt> - delete the oldest snapshot on
> both systems if the send / receive worked> > Can anybody think of any
> potential problems I may have missed? > > Bearing in mind I've next to no
> experience in bash scripting, how does the> following look?> >
> **********************************************************************>
> #!/bin/bash> > # Prepare variables for e-mail alerts> SUBJECT="zfs send /
> receive error"> EMAIL="[EMAIL PROTECTED]"> > NEWSNAP="build filesystem +
> snapshot name here"> RESULTS=$(/usr/sbin/zfs snapshot $NEWSNAP)> # how do I
> check for a snapshot failure here? Just look for non blank> $RESULTS?> if
> $RESULTS; then> # send e-mail> /bin/mail -s $SUBJECT $EMAIL $RESULTS> exit>
> fi> > PREVIOUSSNAP="build filesystem + snapshot name here">
> RESULTS=$(/usr/sbin/zfs send -i $NEWSNAP $PREVIOUSSNAP | ssh -l *user*>
> *remote-system* /usr/sbin/zfs receive *filesystem*)> # again, how do I check
> for error messages here? Do I just look for a blank> $RESULTS to indicate
> success?> if $RESULTS ok; then> OBSOLETESNAP="build filesystem + name here">
> zfs destroy $OBSOLETESNAP> ssh -l *user* *remote-system* /usr/sbin/zfs
> destroy $OBSOLETESNAP> else > # send e-mail with error message> /bin/mail -s
> $SUBJECT $EMAIL $RESULTS> fi>
> **********************************************************************> > One
> concern I have is what happens if the send / receive takes longer than> 15
> minutes. Do I need to check that manually, or will the script cope with> this
> already? Can anybody confirm that it will behave as I am hoping in that> the
> script will take the next snapshot, but the send / receive will fail and>
> generate an e-mail alert?> > thanks,> > Ross> --> This message posted from
> opensolaris.org> _______________________________________________> zfs-discuss
> mailing list> zfs-discuss@opensolaris.org>
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss>
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