On Fri, Apr 4, 2008 at 11:36 PM, Matt Shields mattboston@gmail.com wrote:
On Fri, Apr 4, 2008 at 9:03 AM, Ruslan Sivak rsivak@istandfor.com wrote:
David Hrbác wrote:
Ruslan Sivak napsal(a):
We are building an exchange cluster with two front end Outlook Web
Access servers. We would like to at least have some sort of failover, and prefereably load balancing for them.
Russ
Russ, take a look at
http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html
David _______________________________________________
Yes, that what I was thinking. However, I believe these servers also run smtp, pop3, imap,etc, so I don't think Apache can handle all of those..
LVS handles all protocols. It can do any port and UDP or TCP. It supports different types of balancing Round Robin (rr), Weighted Round Robin (wrr), Least Connections (lc), Weighted Least Connections (wlc). It can do sticky sessions, so if OWA doesn't like when you go from server 1 to server 2, LVS will keep the user stuck to one server. Plus a ton of other features. Give it a shot.
I'm trying to setup a couple of LVS servers on CentOS 5 and hitting difficulties. I've been googl'ing around the docs (it mostly all gets back to http://www.austintek.com/LVS/LVS-HOWTO/mini-HOWTO/LVS-mini-HOWTO.html) for a few days now but can't get it to work. It sometimes work temporarily but very quickly a few fail-overs made things totally unworkable.
One issue I suspect that might be in my way to success is that the two servers (I'm trying to use same two servers both as ldirectors and real servers) are assigned to two separate /28 networks, BUT the virtual rack (from ThePlanet) allows both of them to be assigned addresses from each other's network so I assigned an address from the correct network on an alias on the other server (eth0:0).
Does anyone have a working example for this on CentOS 5? The docs I found so far are mostly generic and talk a lot about ancient kernel versions like 2.0, 2.2 and 2.4.
I subscribed to the lvs-users mailing list but I'm not sure how active it is.
Thanks,
--Amos