Hi,
Adam Goryachev wrote on 2009-07-31 18:11:47 +1000 [Re: [BackupPC-users] exclude
file problem]:
> Benedict simon wrote:
> > Dear All,
> >
> > I am new to backuppc [...]
are you sure? My mail folder seems to remember you posting here occasionally
for over a year ;-).
> > [...] how i could exclude the directory
> > "/var/named/chroot/proc/
> > since i dont wanna backup the proc directory
> >
> > part of my pc conf file is here below
> >
> > $Conf{RsyncShareName} = [
> > '/home',
> > '/etc',
> > '/var/mail',
> > '/var/named',
> > '/var/www/html
> >
> > $Conf{BackupFilesExclude} = {
> > '*' => [
> > '/var/named/chroot/proc'
> > ]
> > };
Just for completeness, the excludes are relative to the share name. You would
want
$Conf{BackupFilesExclude} = {
'/var/named' => [
'/chroot/proc'
]
};
or
$Conf{BackupFilesExclude} = {
'*' => [
'/chroot/proc'
]
};
What you had before would have in fact excluded (among others)
'/var/named/var/named/chroot/proc', had that existed.
> Personally, I make the following change instead:
> $Conf{RsyncArgs} = [
> '--numeric-ids',
> '--perms',
> '--owner',
> '--group',
> '--devices',
> '--links',
> '--times',
> '--block-size=2048',
> '--recursive',
> '--checksum-seed=32761',
> '--one-file-system',
> '-D',
> '--bwlimit=64',
> ];
You should change '--devices' to '-D' instead of adding '-D', but that's
probably only cosmetic. '--bwlimit' and '--checksum-seed' are really unrelated
to the matter of excludes. You may or may not want to --bwlimit your transfer
- that totally depends on your circumstances. As for --checksum-seed, it
introduces the possibility of leaving pool file corruption undetected (or
rather of linking to corrupt pool files instead of making a new correct copy
of the file). It is off by default, which, I believe, is a good choice because
it is conservative. You can turn it on if you want - many people do - but you
should be advised that it *is* a tradeoff. You are introducing a margin of
error, if only a small one, and you should be aware of that.
> ie, remove the backupfilesexclude, and instead set rsyncargs, in
> particular, the option that is useful here is "--one-file-system"
> because any proc will always be a different filesystem.
... as will any NFS mounts or temporary local mounts (USB disks, CDROMs, ...),
which you would typically also want to exclude from your backups. You might
even have sysfs mounted on /var/named/chroot/sys or udev on
/var/named/chroot/dev (which you also wouldn't want to backup). Generally,
backup sets seem to map well to (lists of) file systems, though your physical
file system layout may differ from what you'd logically prefer to choose for
good reasons (eg. /var/named/chroot is really an independant FS, but you might
want to hardlink to files on /, so you may have kept it on your root
partition). So, there are good reasons for using --one-file-system, and you may
still need BackupFilesExclude and/or BackupFilesOnly to fully describe your
backup set. And, as always, your requirements (or preferences) may differ from
mine.
> However, if you
> have a number of different mountpoints (different drives) then you will
> need to specify each mount point you need to backup in RsyncShareName.
I believe it is still a good exercise to be clear about what you actually
*want* in your backups. It becomes cumbersome (and error prone) if you have
many hosts with different layouts (but the same backup set), and/or layouts
that change frequently.
Looking at $Conf{RsyncShareName} quoted above, chances are that
--one-file-system does exactly what you want without further changes (but I'm
just guessing), and it may even guard against future surprises (USB sticks
mounted below /home at backup time or such).
> You can copy the default rsyncargs from your config.pl and add the
> modified version to your clienthost.pl or else just modify it in the
> config.pl directly.
... depending on whether it should be the default for all hosts or just a
special case for one host.
BackupPC 3.2.0beta0 introduced the option $Conf{RsyncArgsExtra} to allow for
easier per-client modifications. So you could use
$Conf {RsyncArgsExtra} = [ '--one-file-system' ];
in clienthost.pl to add the option just for that one host (provided you are
using 3.2.0beta0, that is! You probably aren't now, but you might be at some
point in the future).
To sum it up, I agree with Adam's recommendation of using --one-file-system,
but it's not the only way you can do it.
Regards,
Holger
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