MailScanner under openvz
MailScanner at ecs.soton.ac.uk
Tue Apr 27 08:49:11 IST 2010
On 27/04/2010 01:09, Nick Brown wrote:
> On Mon, 2010-04-26 at 08:46 +0100, Julian Field wrote:
> > So I dropped the kids to "2" and it starts, all good as it should.
> > 26227 ? Ss 0:00 MailScanner: master waiting for children,
> > sleeping
> > 26232 ? S 0:02 MailScanner: waiting for messages
> > 28345 ? S 0:02 MailScanner: waiting for messages
> > Except.. (yep there's always an "except")...
> > Often, a child grabs the batch, then, the other kid grabs it,
> > processing it twice, resulting in the recipient getting two copies of
> > the message.
> That's a locking fault.
> That's what I thought but all perms seem correct.
> I’ve never looked at how MailScanner handles file locking – however
> have seen a similar issue previously where the filesystem was stored
> over NFS (Which requires some rejigging to get ‘file locking support’
> out of the box)
MailScanner does not support shared queues over NFS. NFS file locking is
a total nightmare, you're trying to impose a stateful system
(file-locking) on a stateless file server protocol (NFS).
> however the end user was not aware due to the fact it was a Virtuozzo VE.
Julian Field MEng CITP CEng
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