Hi,
info AT newoffice DOT it wrote on 2013-11-18 16:04:25 +0100 [Re:
[BackupPC-users] save backuppc backups on a ultrium tape]:
> [...]
> i've found this script
this would have been a good place to mention where you found it.
> [...]
> DATADIR=/var/lib/backuppc/pc
> BackupPCDATADIR=/dev/st0
This doesn't make sense with respect to the usage of these variables below.
DATADIR would seem to be meant to point to some temporary space available for
this script to put large amounts of data into (tars of the last backup of all
hosts).
BackupPCDATADIR would seem to be meant to be $TopDir/pc - in the case of
Debian and Ubuntu package installs /var/lib/backuppc/pc (what DATADIR is
erroneously set to).
> # Uncomment to remove old backups
> #echo "Removing old backups....."
> #find $DATADIR/ -type f | while read foo; do
> # rm -fv $foo
> #done
Err, well, yes, with the correct settings of the variables. As it is here, it
would remove all BackupPC backups - not likely something you actually want to
do.
> echo "Checking dump directories....."
> ls $BackupPCDATADIR | grep -v archive | while read foo; do
> mkdir $DATADIR/$foo 2>/dev/null
> chmod 777 $DATADIR/$foo 2>/dev/null
I read "chmod 777" as "I don't know what I'm doing, but something didn't work,
and now it apparently does for whatever reasons".
> done
>
> ls $BackupPCDATADIR | grep -v archive | while read host; do
> echo Dumping $host `date`........
Ah, we're at eight dots now. Five seemed plenty.
> $BackupPCBIN/BackupPC_tarCreate -t -h $host -n -1 -s \* . >
> $DATADIR/$host/$host.`date +%Y%m%W`.tar
This is the one interesting line. It would seem to be correct, though your
naming preferences may vary. In particular, %W won't be very descriptive if
you run this more than once a week ;-).
> pbzip2 -p7 $DATADIR/$host/$host.`date +%Y%m%W`.tar
pbzip2 is an interesting idea. Thank you for that. You should probably adapt
the '-p7' switch to what suits your system, though.
There may or may not be reasons for creating an intermediate copy of the tar
file instead of just piping directly into pbzip2. Again, you should see what
fits your system rather than copying what fitted someone else's.
> echo Done! `date`
> done
> exit 0
All in all, my coding style preferences differ, but it would seem to work
(correct variable settings assumed!). What it gives you is compressed tar
archives of the last backup of each host in a directory somewhere (or rather
a directory of directories). Nothing is written to tape anywhere, though you
might just need to put it somewhere your tape system is configured to pick it
up. No synchronization though (unless this is *called* by the tape system as a
pre-backup command). No logic to decide whether any backup has actually
completed since the last call (i.e. if you disable backups for a host, this
script will continue creating a tar of the same last backup of this host; if a
host wasn't reachable today, you'll just get a new copy of yesterday's
backup).
Hope that helps.
Regards,
Holger
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