We have two app machines running SMTP and POP each that access an NFS
backend.
1. Be sure that the time is sync'd on all machines. Otherwise the
qmail-queue does strange things.
2. We have seen some kind of weird problem in that Redhat 6.1 crashes after
about 45 days of operation. I think that one of the processes has some kind
of memory leak.
3. We have a mail specific proxy on the front end from bluetail.com that
presents the entire cluster as one server to the customer. This means that
we can up/down the app servers at any time with no effect on the customer.
It also makes things like adding an SMTP vscanner trivial. I can also fully
support POP-authenticated-SMTP without patching qmail. It also has easy
support for creating separate mail queues for heavy traffic domains or
troublesome domains such as AOL, hotmail, etc. It is a very effective
product.
Duane.
-----Original Message-----
From: Matthew S. Crocker [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, May 17, 2000 8:33 AM
To: [EMAIL PROTECTED]
Subject: Qmail on a linux cluster
Hello,
I'm building a new mail server/pop server cluster.
The cluster will be built using 5 VA linux boxes and a Network Appliance
NetFiler. One of the boxes will be a LinuxDirector running the Linux
Virtual Server kernel patch. I want all machines to handle SMTP/POP3/IMAP
using qmail. User directories will be NFS mounted from the netfiler. Mail
queue's can either be local or NFS mounted. Has anyone done this? Are
there any pitfalls I should be aware of? Can I use the same NFS mounted
mailqueue on all machines? Will there be a problem with two qmail
processes writing mail to the same user mbox over NFS? What if a user is
picking up mail via POP from one machine while another machine is writing
mail for that user? The user password/alias file will be handled from a
MySQL database now, I'll be moving it to Oracle later this year.
-Matt
--
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Matthew S. Crocker
Vice President / Internet Division Email: [EMAIL PROTECTED]
Crocker Communications Phone: (413) 587-3350
PO BOX 710 Fax: (413) 587-3352
Greenfield, MA 01302-0710 http://www.crocker.com
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