To achieve the High Availability and Transparent down time, we are using a
VERY NICE protocol specific proxy from bluetail.com. Their programmers
wrote code for telco switches and they have a product that includes
auto-failover, load-balancing, etc and has MANY re-writing and features that
greatly exceed the capabilities of ServerIron or hardware loadbalancers.
I highly recommend the product. You can have many POP, SMTP, IMAP, etc
servers behind a couple of Bluetail servers. Then, assuming that you are
using NFS-shared POP-dirs, you can up/down the qmail app servers with no
effect to the end users. This works VERY well and prevents down time of any
kind.
They have an Web/Radius/DNS product as well.
Duane.
-----Original Message-----
From: Dave Kitabjian [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 15, 2000 12:59 PM
To: 'qmail Mailinglist'
Cc: 'Greg Owen'
Subject: miniQmail and QMQP? (was: Share queue between servers)
1) Are any of you out there running miniQmail / QMQP?
2) What's the final word on which is recommended: multiple inbound SMTP
servers, or a series of QMQP servers? (The goal is high volume / high
availability).
For the latter, here are the two configs I'm considering:
Internet
|
| smtp
|_____________________________________________
| |
| MXa | MXb
_|___ _|___
|miniQ| |miniQ| ...
|_____| |_____|
| |
| qmqpc |
|______________|______________________________
___|_____ ___________
| qmail/ | | RAID |
| qmqpd |---| -queue |
|_________| | -Maildirs |
| |___________|
| NFS
______________________|______________________
| |
| |
_|___ _|___
|qmail| |qmail| ...
|_____| |_____|
| | DNS round robin
| pop | pop
|______________|______________________________
|
|
Internet
Here's the other config:
Internet
|
| smtp
|_____________________________________________
| |
| MXa | MXb
_|___ _|___
|qmail| |qmail| ...
|_____| |_____|
| |
| NFS |
|______________|______________________________
___|_______
| RAID |
| -queue |
| -Maildirs |
|___________|
| NFS
______________________|______________________
| |
| |
_|___ _|___
|qmail| |qmail| ...
|_____| |_____|
| | DNS round robin
| pop | pop
|______________|______________________________
|
|
Internet
Notes:
1)For the moment, both POP sides are the same (I'm not sure what other
POP options exist).
2)The first uses miniQmail; the 2nd does not.
3)The first has a "master" qmail server. The second are pure peers,
offering better availability.
Is the 2nd option even possible with qmail? Any and all educated input
is more than welcome. How do some of you very large sites operate?
Thanks!
Dave
_____________________________________
Refs:
http://cr.yp.to/qmail/mini.html
http://cr.yp.to/proto/qmqp.html
http://cr.yp.to/qmail/faq/incominghost.html#organize
http://cr.yp.to/qmail/faq/servers.html#qmqpd
http://web.infoave.net/~dsill/lwq.html#big-servers
http://www.nrg4u.com/qmail/QLDAPINSTALL
http://www.nrg4u.com/qmail/the-big-qmail-picture-103-p2.gif
http://msgs.securepoint.com/cgi-bin/get/qmail9811/179/1/1/1.html
http://msgs.securepoint.com/cgi-bin/get/qmail9811/175/1/1.html
