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Chris Williams wrote:
>
> 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.
presumably you've read
http://www.linuxvirtualserver.org/Joseph.Mack/HOWTO/LVS-HOWTO-6.html#ss6.7
the proper way to bring down a realserver is to set the weight to 0
http://www.linuxvirtualserver.org/Joseph.Mack/HOWTO/LVS-HOWTO-5.html#ss5.1
and then wait till the clients have disconnected.
> 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.
no new connections should be made after you quiesce the realserver, but
you have to let the client complete their connection.
> 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.
keepalive is for maintaining an idle connection. The 2 minute timeout
is the FIN_WAIT for an InActConn to clear.
>
> 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?
you're not allowed to remove connected clients no matter how long they're
connected. It's a feature.
Joe
--
Joseph Mack PhD, Senior Systems Engineer, SAIC contractor
to the National Environmental Supercomputer Center,
mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA
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