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Hey all,
I wrote sometime ago with a problem with persistance I was having, I
received good advice to rewrite the software to allow session affinity
which I did allowing me to abandon persistance all together.
My setup is an LVS director hooking into 3 real servers serving
apache/tomcat4 w/session affinty.
Although I've now got a working system I have encountered a problem
whereby if I cut a real server down, ipvsadm takes the real server off
of its list but traffic still gets directed to the 'dead' real server.
LVS persistance is set to 0 so that's not the problem. After 2-5 minutes
requests stop being sent to the dead server and everything is hunky-dory
again.
I remembered this from a previous mail list question:
> > > Also setting persistance to 1 seems to affect the result for much more
> > > then 1 second, what exactly does this do?
> >
> > don't know. You will have to wait for the TCP timeouts which are of the
> > order
> > of 2mins in Linux (look at the connections with `netstat -an`)#
So maybe it is something to do with TCP timeouts? I checked out
/proc/sys/net/ipv4/tcp_keepalive_timeout but that was set to 7200 (2
hours,) which is far longer then the problem I am encountering.
2 minutes is too long to be throwing away requests, how can I improve
the speed so that when a real server drops out, no one (except me)
notices?
Thanks for all the help,
Chris.
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