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List:       linux-virtual-server
Subject:    Re: Mailserver on LVS
From:       Michael Boman <michael () wizoffice ! com>
Date:       2000-04-24 9:08:52
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On Thu, Apr 20, 2000 at 05:25:29PM -0400, Jeremy Hansen wrote:
> 
> Yeah, didn't think of that, not sure how qmail's trigger handles that.  I
> really don't see how a central queue in this case would have any
> advantages over two separate queue and those machines being balanced.
> 
> -jeremy

From the doc's and qmail's mailinglist archive it say's that you can't share
the queue! Qmail doesn't do any kind of locking of email's in the queue when
it is sending the mail.

A central queue wouldn't add any preformence boost as the queue is traveling in
the network in a very slow way. If you want to have a central queue look at
QMTP. It's located at Dan's pages somewhere..

Best regards
 Michael Boman

> > yeah, i wasn't really worried about the queueing as much as when qmail
> > grabs messages out of the queue to send/deliver.  if both try to do it at
> > the same time, what happens?  qmail's pretty smart, but i don't know what
> > kind of locking mechanisms it has for stuff like that.  that could get
> > shaky.  maybe i'm just not looking at it right.
> > 
> > -tcl.
> > 
> > On Thu, 20 Apr 2000, Jeremy Hansen wrote:
> > 
> > > If the qmail queue is on the same filesystem, I believe it should be ok
> > > since qmail writes it's queue files as the name of the inode on the
> > > filesystem.  This should keep things unique, I think.
> > > 
> > > -jeremy
> > > 
> > > > i've never tried it with coda, but i've used qmail+lvs successfully.  if
> > > > you use tcpserver, there's some flag to turn off ident lookups.  use that,
> > > > or you'll get major bad performance.
> > > > 
> > > > you're going to share the queue and have both qmails running at the same
> > > > time?  hmm, that could get messy.  i'm not sure if qmail handles that
> > > > safely or not.  it indeed might.  if you're just going to use it for
> > > > failover safety, that shouldn't be an issue, but both going at the same
> > > > time with a shared queue dir?  hum...
> > > > 
> > > > -tcl.
> > > > 
> > > > On Thu, 20 Apr 2000, Madhav wrote:
> > > > 
> > > > > Hi all,
> > > > > 
> > > > > We have set up a LVS cluster with heartbeat, mon and coda(2 routers+2 real
> > > > > servers) for telnet,ftp and http services. I am planning to implement the
> > > > > mail service also in this setup.
> > > > > 
> > > > > Now I have installed qmail in one real server and it is working fine. I am
> > > > > planning to install qmail under coda(usually qmail directory will be under
> > > > > /var/qmail) so that I can have replication of mail data(with coda) and also
> > > > > masking of the failed mail server(with mon). I would like to know whether
> > > > > anyone tried this earlier and if not can anyone foresee any problems with
> > > > > this setup(like both the mail servers trying at the same time to send mails
> > > > > from the same mail queue)?.
> > > > > Any suggestions or ideas will be appreciated.
> > > > > 
> > > > > Thanks,
> > > > > Madhav

-- 
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