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Snapshot of running Servers

Posted August 25th, 2008 by ch3ka

We are currently changing our server setup in the office.

We used to have five Servers running in the same CC, but we rented 2 new Servers and now want a total of three - the best of the five old ones and the two new ones.

The first new Server is already set up, we just installed the application there, migrated the Data and the DNS. No Problem here.

But now we have to mix the dozen applications running on the five old servers to two, one of them running an application which I want to transfer.

No way we can do that via hot migration.

Well, of course we have backups, but they are 1 day old, and not directly mountable - which is what we need to mix the applications.

So what I want is a snapshot of each server. It should be ready for emergency-playback and also mountable.

You might say 'thats no big deal, just get a tarball and a mysqldump'. Thats exactly what I'm goin to do. But as I'm lazy, I do only want to dive through manpages once, and maybe this is useful for some1 else, so I post my snapshot/backup-script here:
#!/bin/sh echo "starting backup of this machine"; ######################################################## # By ch3ka, tested and worked with ZSH_VERSION=4.3.2. # # As-is, do whatever u want with it but dont blame me. # # read and understand be4 execution! # # requires 0cuz root privileges on machine and mysql # # What it should do: backup ur / and mysqldump to # # $tmpdir. Watch out for the --one-file-system switch! # ######################################################## #####CONFIG SECTION###### mysqlpw=IAMAMYSQLROOTPW; #ur mysql root-password ###MAYBE-CONFIG SECTION## timestamp=$(date +%Y-%m-%d); #want to tag backups w/ date tmpdir=/tmp/; #tmpsave in this dir for later scp hostname=$(cat /etc/hostname); #want to know which machine fileprefix=${tmpdir}host_${hostname}_${timestamp}; #####MAGIC SECTION####### tar \ --one-file-system \ --numeric-owner \ --exclude=tmp \ --exclude=var/tmp \ --verbose --verbose \ --directory=/ \ -czf ${fileprefix}.tar.gz . \ > ${fileprefix}.tar.log \ 2> ${fileprefix}.tar.err || echo "tar exit with errors / warnings"; mysqldump -uroot -p${mysqlpw} --all-databases | gzip \ > ${fileprefix}.sql.gz \ 2> ${fileprefix}.sql.err || echo "mysqldump exit with errors / warnings"; echo "End. Your backup files are stored in ${tmpdir}"; echo "named ${fileprefix}.*"; echo "Review the logs and scp them to a safe place.";

DISCLAIMER: It is a long time since I was into shell coding, USE AT OWN RISK
Comments on bad design / techniques are welcome (commendations also *g)

If you liked this, buy me a beer and / or comment below

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