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Date:      Mon, 9 Jul 2007 13:43:52 -0700 (PDT)
From:      L Goodwin <xrayv19@yahoo.com>
To:        Roland Smith <rsmith@xs4all.nl>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Correct way to use dump to backup a Samba share
Message-ID:  <396655.30624.qm@web58108.mail.re3.yahoo.com>
In-Reply-To: <20070708080431.GA17250@slackbox.xs4all.nl>

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Thanks for filling in the blanks, Roland!

--- Roland Smith <rsmith@xs4all.nl> wrote:

> On Sat, Jul 07, 2007 at 06:42:20PM -0700, L Goodwin
> wrote:
> > I have a Samba share on a software RAID 1 array
> (using
> > gmirror) that I need to backup. I want to create a
> > shell script that does a level 0 backup every time
> to
> > (alternately) one of two USB drives. I plan to
> have
> > only ONE USB drive connected at a time. 
> > 
> > I want the script to mount the drive, perform the
> > backup, then unmount the drive so that it is ready
> for
> > someone who knows zip about computers to safely
> remove
> > and take offsite. 
> > 
> > Here are the steps I have for the script.
> > Is this all I need to do? Do I need any error
> handling
> > logic? THANKS!
> 
> > # Mount the backup drive:
> > mount /dev/usb0
> > 
> > # Create the backup:
> > /sbin/dump -0u -f /dev/usb0 /sambavol
> > 
> > # Unmount the backup drive:
> > umount /dev/usb0
> 
> The following is a rough outline of what you should
> do;
> -------------- shell-script --------------
> #!/bin/sh
> # The following assumes that the USB mass-storage
> device is formatted
> # with a UFS filesystem
> 
> # Only root can perform dumps.
> if [ $(id -u) -ne 0 ]; then
>     echo "Only root can perform dumps. Exiting."
>     exit 1
> fi
> 
> DDIR=/mnt/root
> # First, check if the target directory exists
> if [ ! -d $DDIR ]; then
>     echo "The $DDIR directory doesn't exist.
> Exiting."
>     exit 1
> fi
> # Then check if it is already mounted
> if mount|grep $DDDIR >/dev/null; then
>    echo "The $DDIR directory is already in use.
> Exiting"
>     exit 1
> fi
> 
> # Check if the device to dump to exists;
> DEV=/dev/da0
> if [ ! -c $DEV ]; then
>     echo "The $DEV device doesn't exist. Exiting."
>     exit 1
> fi
> # Check if the device is already mounted
> if mount|grep $DEV >/dev/null; then
>    echo "The $DEV device is already mounted.
> Exiting"
>    exit 1
> fi
> 
> SRC=/sambavol
> DFLAGS="-0 -u -f"
> # Check if the filesystem that is to be dumped
> exists.
> if [ ! -d $SRC ]; then
>     echo "The $SRC directory doesn't exist.
> Exiting."
>     exit 1
> fi
> # Now check if it is mounted
> if mount -t ufs|grep $SRC; then
>    DFLAGS="-L "$DFLAGS
> fi
> 
> # Mount the USB device.
> if ! mount $DEV $DDIR; then
>    "Mounting the USB disk failed. Exiting"
>    exit 1
> fi
> 
> DATE=$(date "+%Y%m%d")
> # Perfrom the dump, assuming that the filesystem is
> live.
> dump $DFLAGS ${DDIR}/sambavol-0-${DATE}.dump $SRC
> 
> umount $DDIR
> -------------- shell-script --------------
> 
> Of course, you have to remove old dumps once in a
> while, lest you run
> out of disk space.
> 
> Depending on the contents of the samba share, it
> might be worthwhile to
> compress the dump with gzip;
> 
> # Perfrom the dump, 
> dump $DFLAGS - $SRC|gzip
> >${DDIR}/sambavol-0-${DATE}.gz
> 
> Roland
> -- 
> R.F.Smith                                  
> http://www.xs4all.nl/~rsmith/
> [plain text _non-HTML_ PGP/GnuPG encrypted/signed
> email much appreciated]
> pgp: 1A2B 477F 9970 BA3C 2914  B7CE 1277 EFB0 C321
> A725 (KeyID: C321A725)
> 



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