rsync - Apr 2005 - Rsync over an NFS mount (Scanned @ Decoma)

If I perform an local rsync with the 'delete' option over an NFS mount,
and
the mount point has been unmounted, the rsync will delete what was once on
the local box..

For example
Machine 1(192.168.0.1) is a live production server with a database within
the /DB directory
Machine 2 (192.168.0.2)  is an idling server, capturing all changes of
Machine 1's database.
The rsync is done over an NFS mount onto machine 1, rather than via rsync
client/server
>From Machine 2 :
mkdir /mnt/plantx
mount 192.168.0.1:/DB/plantx   /mnt/plantx

rsync -av --delete 127.0.0.1:/mnt/plantx/  /DB/plantx -e ssh

Now , If I reboot machine 2, and forget to do the NFS mount, (actually the
above rsync is in a crontab entry to happen automatically), then the
/DB/plantx will be empty due to the 'delete' option of the rsync
statement.
I would assume this is a bug ???

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Hi,

On Fri, 1 Apr 2005 Lester_Linnell@decoma.com wrote:
> If I perform an local rsync with the 'delete' option over an NFS
mount, and
> the mount point has been unmounted, the rsync will delete what was once on
> the local box..
This is correct behaviour, if the source directory is empty.

Ckeck if mounted before invoking rsync.

Cheers -e
-- 
Eberhard Moenkeberg (emoenke@gwdg.de, em@kki.org)

Lester_Linnell@decoma.com wrote:
>Now , If I reboot machine 2, and forget to do the NFS mount, (actually the
>above rsync is in a crontab entry to happen automatically), then the
>/DB/plantx will be empty due to the 'delete' option of the rsync
statement.
>I would assume this is a bug ???
>
>  
>
Um.....why wouldn't you have the NFS share automatically mount at boot 
time (fstab)?

And/or, like Mr. Moenkeberg suggested:
NFS_MNT="/mnt/plantx"
MOUNT_CHK=`/bin/mount -l | /bin/grep $NFS_MNT | /usr/bin/wc -l`
if [ "$MOUNT_CHK" = 1 ]
    rsync...
    exit 0
else
    echo "D'oh! You didn't mount the NFS share again!" >
/var/log/rsync.log
    exit 1
fi

Works for bash on linux anyways.

Tis what I do for local backups to a USB drive. Gotta make sure it's 
actually plugged in or else your harddrive fills up REALLY quick.

-john