Chris Lewis Wrote:
Charlie Brady wrote:
On Sun, 26 Jul 2009, Junyi-HUANG wrote:
Robin Bowes Wrote:
Take a look at the queue/smtp-forward plugin.
I'm pretty sure it would be trivial to modify that to deliver to
specific servers based on header content.
Thanks much Robin, yes , i agree . i think of queue/smtp-forward too.
but, base on the header , i want to route to a set of servers , not
only to a certain server in the purpose of HA and LB.
...
Any clue will be appreciated.
As I said earlier, I think you should do that with DNS, which already
does RR load balancing. Alternatively, you could do it with iptables
(assuming you are using linux).
Thanks Charlie , yes , I agree , DNS RR can solve the LB problem ,
but what about HA , and also , in my next plan , i even want it can be
dst-domain balance ( the same domain in each queue is balance ), maybe i
have to run a script to monitor each queue status every intervals and
generate a report , based on the report , forwarder can pick up the
appropriate smtp server to route the message.
So i still have to realize this within the plugin . but as far as i
know , the plugin only has Connection and Transaction Notes , which is
only in Connection scope , i think my server lists should be in the
whole program scope , which can shared by each connections . maybe what
i know is little , please correct me .
For HA you need failover. _That_ is what you need to implement in the
forwarder.
My qpsmtp-async forwarder has a config list of IPs (and ports).
During register, it randomizes the order. Associated with each IP is
a "score". You could also do _that_ bit with DNS RR tricks.
Thanks a lot Chris , I am very interesting in your forwarder plugin,
want to study it .
but by googling many times , i can't find where it is .
Would you mind sharing your code with me or tell how to get it ?
--Junyi
