Hi Luc, Same problem, same topology, but using debian 6 and keepalive 1.2.2 .... without solution yet......
[]´s Victor 2011/7/4 Luc van Donkersgoed <[email protected]> > Hi all, > > I'm running a small apache cluster (2 loadbalancers in active-passive > setup, 2 realservers serving HTTP and HTTPS). > > All machines are Dell PowerEdge (R200 and R410 series), not older than 2 > years, running Ubuntu 11.04 with all packages updated. > > My loadbalancers are configured with: > > Heartbeat 3.0.4 > Linux Director v1.186-ha > ipvsadm v1.25 2008/5/15 (compiled with popt and IPVS v1.2.1) > > ==== ldirectord.cf ==== > > checktimeout=10 > checkinterval=2 > autoreload=no > logfile="local0" > quiescent=no > > virtual=x.y.z.141:80 > real=x.y.z.135:80 gate 50 > real=x.y.z.136:80 gate 50 > fallback=127.0.0.1:80 gate > service=http > request="ldirector.html" > receive="Test Page" > scheduler=wrr > protocol=tcp > checktype=negotiate > > virtual=x.y.z.141:443 > real=x.y.z.135:443 gate 50 > real=x.y.z.136:443 gate 50 > fallback=127.0.0.1:80 gate > service=https > request="ldirector.html" > receive="Test Page" > scheduler=wrr > protocol=tcp > checktype=negotiate > > ==== ipvsadm -ln ==== > > IP Virtual Server version 1.2.1 (size=4096) > Prot LocalAddress:Port Scheduler Flags > -> RemoteAddress:Port Forward Weight ActiveConn InActConn > TCP x.y.z.141:80 wrr > -> x.y.z.135:80 Route 50 110 51 > -> x.y.z.136:80 Route 50 103 59 > TCP x.y.z.141:443 wrr > -> x.y.z.135:443 Route 50 12 14 > -> x.y.z.136:443 Route 50 12 6 > > ==== the problem ==== > > When I (re)start my loadbalancer, the load is evenly balanced over my two > realservers. The output of ipvsadm -ln is at that moment comparable to the > output above. This is all as I would expert. Then, after somewhere between > 30 minutes and 2 hours, the results of ipvsadm -ln changes to something like > this, while the load on the webservers does not significantly change: > > IP Virtual Server version 1.2.1 (size=4096) > Prot LocalAddress:Port Scheduler Flags > -> RemoteAddress:Port Forward Weight ActiveConn InActConn > TCP x.y.z.141:80 wrr > -> x.y.z.135:80 Route 50 0 1 > -> x.y.z.136:80 Route 50 1 1 > TCP x.y.z.141:443 wrr > -> x.y.z.135:443 Route 50 2 1 > -> x.y.z.136:443 Route 50 1 0 > > Around the same time, the loadbalancer seems to become unbalanced, sending > all requests to one server. This is not always the same server, it seems to > be random. This server then becomes heavily loaded, while the other server > is idling. After a while (perhaps 30 minutes) the loadbalancer starts to > send packages to the unused realserver again. A little while after that, the > balance tips again, often preferring the other server this time. > > The problem is always solved by restarting heartbeat, at which time the > other loadbalancer takes over and starts to distribute the load evenly > again. Then, after a while, this server starts to display the same issue. > > A source for my problem might be found when running ipvsadm -ln --stats, > which displays the following: > > IP Virtual Server version 1.2.1 (size=4096) > Prot LocalAddress:Port Conns InPkts OutPkts InBytes > OutBytes > -> RemoteAddress:Port > TCP x.y.z.141:80 20899 198954 0 21196756 0 > -> x.y.z.135:80 10449 101877 0 10743318 0 > -> x.y.z.136:80 10450 97077 0 10453438 0 > TCP x.y.z.141:443 2852 46171 0 8971996 0 > -> x.y.z.135:443 1426 23411 0 4485847 0 > -> x.y.z.136:443 1426 22760 0 4486149 0 > > This would suggest that the number of connections are still evenly > distributed over the two realservers, even if the realservers themselves > don't agree. > > Can anyone help me locate the reason for the round robin scheduler not > distributing my requests evenly? > > Thanks in advance, > Luc van Donkersgoed > _______________________________________________ > Please read the documentation before posting - it's available at: > http://www.linuxvirtualserver.org/ > > LinuxVirtualServer.org mailing list - [email protected] > Send requests to [email protected] > or go to http://lists.graemef.net/mailman/listinfo/lvs-users > _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - [email protected] Send requests to [email protected] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
