On 01/13/2013 12:30 AM, Gordon Messmer wrote:
> If you want to make a backup that's consistent across a filesystem, you
> need to make a snapshot, mount it, and back up the snapshot content. If
> there are files open for writing, you need to make them consistent while
> the snapshot is made. While I rarely say nice things about Windows,
> this is an area where Linux falls far short. There is no common
> mechanism for making files and databases consistent and making a
> snapshot for backups. Admins must do this on their own. If you aren't
> actively taking steps to make your backups consistent, they aren't.
After publicly bitching about Linux's poor backup infrastructure for the
hundredth time, I decided to write a system largely similar to VSS.
I've written the first iteration in bash. It took one day to do most of
the work, and then a few hours of testing and fixing to get things
working reasonably well.
https://bitbucket.org/gordonmessmer/dragonsdawn-snapshot
At this point, there's enough working for other people to start looking
at. Systems with ext3/4 filesystems on LVM are supported. btrfs will
follow. PostgreSQL has a script to make its data consistent, but other
common systems like MySQL, OpenLDAP, and 389 DS need similar support.
Documentation needs to be written. A few architectural issues need to
be ironed out.
If you're interested in improving the state of backups on GNU/Linux,
please have a look and contact me if you want to help with code,
testing, documentation, packaging, or maintaining packages in
distributions so that this becomes a standard feature.
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