Robert Moskowitz wrote:
From the howto: http://www.faqs.org/docs/securing/chap29sec305.html
I got some ideas to help me to tar up the OS. I had already been shown
how to wrap it into SSH to deposit the tar file on another system, so I
tried the following:
tar cpvzf - -C / --exclude home --exclude media --exclude mnt
--exclude proc --exclude */lost+found | ssh root@xxxxxxxx
"cat>backup-060907.tgz"
But, whereas the howto is talking about --exclude dealing with files,
the Centos Man on tar is saying that it applies to files.
So what is wrong? I know the SSH stuff is correct as when I put in
something like ls I get a file with result of the ls. Also I had done
this without the excludes and of course it died slowing when it got to
/media/cdrom :(
I know this works for me:
tar clf homes.tar --exclude=scripts --exclude=conf --exclude=bin \
--exclude=incoming -C ${BASEDIR} .
but I had a completely garbage backup of my firewall, taken just before
the disk died (I thought, briefly, how fortuitous my timing was!) using
ssh that way.
The problem is, I have this alias:
alias ssh='ssh -t'
and the result of that is the shell (or something) injects the
occasional screen control sequence, and my backup was cactus. Absolute junk.
The way to be sure is:
tar cpvzf - -C / <more tar stuff> | \ssh <ssh stuff>
btw unless you have a very fast CPU and/or a slow link, it's faster
without the compression.
You might also find it simpler to use the "l" switch as I do to avoid
crossing filesystem boundaries; in your case it would automatically
exclude /proc, /sys and anything mounted anywhere, such as /media,
/home, /mnt. I do this:
tar clC / / /boot /home /var \
| tar xpC /mnt/backup || { df -h ; exit ; }
I do have a list of exclusions (eg --exclude=/var/spool/postfix/),
enough to cloud the issue:-)
This example's on Debian, and the buffer command's there in hopes of
reducing head movement and so accelerating the process.
--
Cheers
John
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