LVS TCP connection timeouts - lingering connections
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by Jon Topper
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Published on 2009-08-10T14:51:50Z
Indexed on
2010/05/04
5:08 UTC
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I'm using keepalived to load-balance connections between a number of TCP servers. I don't expect it matters, but the service in this case is rabbitmq. I'm using NAT type balancing with weighted round-robin.
A client connects to the server thus:
[client]-----------[lvs]------------[real server]
a b
If a client connects to the LVS and remains idle, sending nothing on the socket, this eventually times out, according to timeouts set using ipvsadm --set
. At this point, the connection marked 'a' above correctly disappears from the output of netstat -anp
on the client, and from the output of ipvsadm -L -n -c
on the lvs box. Connection 'b', however, remains ESTABLISHED according to netstat -anp
on the real server box.
Why is this? Can I force lvs to properly reset the connection to the real server?
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