Hello everyone.
This is my first question here so please forgive me if i'm out of topic or
something...
I'm building up this architecture with postfix + ldap + Courier IMAP
(i hope the below ascii art is displaying correctly :)
|-------------|
| postfix1 | very big storage
| LDAP1 |-------------|********************
| server1 | | *
|-------------| | /home1 *
| | *
| |-------------------*
|-------------| | *
| postfix2 | | *
| LDAP2 |-------------| /home2 *
| server2 | | *
|-------------| | *
| |-------------------*
| | *
|-------------| | /home3 *
| postfix3 | | *
| LDAP3 |-------------|********************
| server3 |
|-------------|
Now, let me explain how this is going to work.
This architecture works with Qmail+Ldap and now i'm migrating to PostFix (for
many reason)
server1,2,3 have 1 balancer in front which simply redistribute the traffinc
among the 3 servers.
if server1 goes down the cluster will mount up server1 interface and home
partition on server2. Server2 will temporarily act as server1 and server2
untill server1 is back on line.
Each LDAP have list of his users. For each LDAP entry we have a record telling
us, who is the MailServer for that user. So if the balancer send user "test" to
mail server1 and from the LDAP we see that "test" user belong to server1 then
"test" request is served, ELSE if user "test" has mail server set on
"mailserver3" for example, the request is redirect to mailserver3 that will
handle his request.
Now, i've a couple of questione here.
1) I've never used Courier IMAP, but reading on the internet i've found that it
use gethostbyname() to resolve and this may cause an infinite loop for a host
with 2 interface but one hostname if one server goes down.
So, i'm afraid that i wont be able to install courier-imap on each server and
this will cause a big problem to the scalability of the system.
2) Has anyone ever tryed something like this and its ablet to redirect me to
some good documentation?
Thank you very much for your time and for any tip or advice.
Good bye everyone.
--
spambox <[email protected]>
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