On Mon, Sep 26, 2011 at 09:00:03AM -0400, Jeffrey J. Kosowsky wrote:
> maarten AT tepaske DOT net wrote at about 10:29:16 +0200 on Monday, September
> 26, 2011 > So I am currently writing some scripts for my backup needs. Which
> made
> > me wonder, BackupPC essentially starts a backup like this:
> >
> > /usr/bin/ssh -4 -q -l backuppc <host> sudo /usr/bin/rsync --server
> --sender --numeric-ids --perms --owner --group -D --links --hard-links
> --times --block-size=2048 --recursive . <directory>
> >
> > But how does this really work? I understand rsync starts in server mode
> > on the host that is to be backed up, but I don't see a rsync process
> > being started on the BackupPC server.
>
> Well remember that BackupPC uses it's own perl-based client version of
> rsync 'perl-File-RsyncP' which implements a subset of rsync
> functionality and interfaces with the rsync client.
>
> The line you quote above ssh's into the remote client and starts up a
> rsync process there. But of course that ssh line doesn't start the
> local rsync process that you need to communicate with the remote
> process.
Thanks, that explains a lot!
> If you are trying to run rsync standalone over ssh without using
> BackupPC, then you should invoke rsync over ssh the *normal* way which
> starts up the process locally and then uses ssh to start the remote
> rsync process.
>
> Specifically, if you want all the same flags as BackupPC uses, try
> something like:
>
> sudo /usr/bin/rsync --numeric-ids --perms --owner --group -D --links
> --hard-links --times --block-size=2048 --recursive
> <backuppc>@<host>:<directory> .
OK, I will read a bit more into the rsync documentation. I thought this
way I wouldn't be able to limit the privileges through sudo, but maybe
I'm wrong.
> But this is really just standard rsync usage. Also, manually setting
> the block-size doesn't make sense if not using BackupPC (where it's
> set that way for checksum caching and actually ignored) since the
> automatic default setting will generally be more efficient. There may
> be other options you want to add or delete.
>
> But this has nothing really to do with BackupPC...
Still it's good to know.
Thanks for the elaborate anwer!
Maarten
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