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On Fri, 2008-05-09 at 05:13 +0300, Janar Kartau wrote:
> The problem was indeed in the TCP session timeout settings. It defaults
> to 900 seconds in CentOS 5. Connections made between the realserver
> crash and pulse removing the node from the LVS config would remain in
> ESTABLISHED state since director never got a CLOSE. As a result, these
> dead connections remained in the ipvs table for whole 15 minutes and
> thus making the realserver useless until the connections finally timed
> out. I'm surprised nobody had this problem before.
This is what the expire_nodest_conn and expire_quiescent_template
sysctls are for. Toggling them to "on" respectively removes the IPVS
table entries when the realserver is removed from the pool, or removes
any persistence templates when weight = 0.
Graeme
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