Hello all, We are using LVS with the Piranaha GUI that comes with CentOS 5.4. I have a couple of questions:
We have a few VIPs configured, some of which use persistence. But the output of --persistent-conn doesn't make any sense to us. rr.mydomain.com is our very busy load balanced web app. PersistConn shows 0. But webmail.mydomain.com is our very lightly loaded webmail cluster. It gets maybe an access every 30 minutes. With a persistence timeout of 3600 4 and 6 might make some sense. But 0 for rr makes no sense at all. 0 active connections for dbro and dbrw makes no sense also. I have a connection to it right now and it still shows zero. [r...@dblvs1 ~]# /sbin/ipvsadm --list --persistent-conn IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Weight PersistConn ActiveConn InActConn -> RemoteAddress:Port TCP rr.mydomain.com:htt wlc persistent 7500 -> rr1.mydomain.com:ht 1 0 0 0 -> rr2.mydomain.com:ht 1 0 0 0 TCP webmail.mydomain.co wlc persistent 3600 -> webmail2.mydomain.c 1 4 0 0 -> webmail1.mydomain.c 1 6 0 0 TCP rr.mydomain.com:htt wlc persistent 7500 -> rr2.mydomain.com:ht 1 0 0 0 -> rr1.mydomain.com:ht 1 0 0 0 TCP dbro.mydomain.com:m wlc -> db3.mydomain.com:my 1 0 0 0 TCP dbrw.mydomain.com:m wlc -> db1.mydomain.com:my 1 0 0 0 Another weird thing is that with wlc (the default, at least when configured with piranha) we generally only see traffic being sent to rr1 and very rarely to rr2. Is this normal? I have a hunch "weighted least connections" means traffic goes to whichever machine has the fewest connections but when they both have zero it would be nice for my developer's confidence in lvs if it fell back to round robin instead of all going to the same machine. We could just use roundrobin but as long as the persistence and active connection numbers aren't making sense we wanted to stick with as close to a default config as possible until we figure that out. Also note that rr.mydomain.com appears twice because one is http and the other is https. Are there any problems with running two pools of servers on the same IPs but on different ports? It seems like it should work to me but someone here has questioned whether that might somehow be confusing our connections numbers. Thanks! -- Tracy Reed http://tracyreed.org
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