[Csync2] Csync2 newbie alert

[Gary E. Miller]

Yo Samba!

On Tue, 12 Jun 2012 18:58:37 +0530
Samba <saasira at gmail.com> wrote:

> CSync2 daemon must be running on both the the servers,

Well, if that were true I would not be getting the good results I
am getting now.

> preferably as (x)inetd daemon;

Why do you say that?  I'll be updating remote files constantly so I'll
just run it as a daemon.  Less load on my HDs which are always
pushed hard.

> csync2 daemon does not identify itself as a master or
> slave, it just runs. What qualifies a particular setup a master or
> slave is the csync2*.cfg files which specify on a per "group" basis
> whether that particular node should have as a master or a slave for
> that group of files like :

Yes, that part is clear from the dock.

> In addition to the above, csync2 requires that a (scheduled via cron
> or similar) trigger ( csync2 -x ) instruct the csync2 daemon (on the
> presumed master side) to identify the changed files out of those
> configured to be replicated and then sync those with the peer (slave)
> servers.

Interesting, so 'csync2 -x' must either behave differently if the dameon
is running, or run in parallel with the daemon.  I' run some tests.

> I hope this helps,

Yes.  It would be nice if some of that was in the pdf doc.

But there were more questions in my email.

> > Sometimes the net connection to the remote hiccups, and csync2 seems
> > to exit with a write error.  Is there a retry mechanism, or do I
> > just need to keep re-running csync2?

Will the daemon retry?  Or wait for the next 'csync -x'?

> > I created the csync databases on master and slave this way:
> >        csync2 -cIr /
> >
> > Then jumped in to the above update loop.  I am worried that some of
> > the files were not in sync before beginning, or may have been
> > corrupted. Is there a way to have csync2 do a scrubbing?  Like the
> > way an ECC RAM controller slowly reads all RAM in the background to
> > be sure all the bits are working.  I could see csync2 randomly
> > testing X number of files to be sure the master and slave checksums
> > match.

Any hope on this one?

BTW, I also noted that there is no option for csync2 to also set the
'ctime' on the slave, like rsync can.

> > Otherwise I may have to run an rsync every once in a while, but
> > then I am back to my problems with rsync being a bit flakey over
> > the internet.

So am I really stuck with keeping rsync around?

> > A doc typo at the start of the last paragraph of 3.4.5:
> >
> >    Usually the action is only triggered on the targed hosts,
> >
> > I assume targed should be targeted.

Fixed in the doc now?

> > And anything else a newbie should know about csync2?

Any other tricks?

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
	gem at rellim.com  Tel:+1(541)382-8588
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