incoming/outgoing spool shared with several mailscanners over nfs?

[Leif Neland]

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Just FYI:

I tried using balance (http://sourceforge.net/projects/balance/)
It's an userland daemon, which listens on one port, and forwards the
requests to several servers on a round robin schedule.
It works ok, but had the disadvantage that all connections to sendmail came
from my own network, and therefore was whitelisted; all acl's on ip was
defeated.
I must look into other types of loadbalancing, beside dns.

Leif


----- Original Message -----
From: "Julian Field" <MailScanner at ECS.SOTON.AC.UK>
To: <MAILSCANNER at JISCMAIL.AC.UK>
Sent: Wednesday, April 27, 2005 11:08 PM
Subject: Re: incoming/outgoing spool shared with several mailscanners over
nfs?


>I would advise the use of multiple independent MailScanner servers, each
> with its own MX record in its DNS. Should load-balance very nicely for
> you.
>
> Sharing mqueue directories is fraught with locking problems and
> inefficient.
>
> The biggest cluster I have heard of is over 100 MailScanner servers.
>
> Leif Neland wrote:
>
>> I've got a mailserver with sendmail and mailscanner, which is getting
>> a bit
>> overloaded.
>>
>> I'm using the setup where one sendmail daemon drops the mail in
>> .../mqueue.in, mailscanner takes the mail from there and drops it in
>> .../mqueue, where another sendmail daemon picks it up and sends it out.
>>
>> Is it possible to share the mqueue.in and mqueue dirs over nfs with other
>> machines?
>> so I can have several mailscanners working on the same diretories without
>> they are trying to process the same files?
>>
>> Or could I make a program which periodically moved mailfiles from one
>> server
>> to another?
>>
>> Leif
>>
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> Julian Field
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