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Hi all,
we have been using lvs in production with redhat rhel5 with direct routing
successfully for years now.
Maintenance of server was no problem, because setting the weight to 0 avoided
new connections and we only had to wait
for the current tcp-sessions to end on the maintained server.
But with our new rhel6-cluster we are having most of the time the problem that
still new http-connections
are being directed to the server that has a weight of 0, although we don't use
persistent connections and there is no
keepalive enabled in httpd.conf, so each tcp-connection ends after very short
time.
config:
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:http wlc
-> lxweb1-stage:http Local 1 0 0
-> lxweb2-stage:http Route 1 0 0
Running stress test with ab from another server:
ab -n 600000 -c 30 http://192.168.0.1/
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:http wlc
-> lxweb1-stage:http Local 1 12 14323
-> lxweb2-stage:http Route 1 10 13868
setting weight to 0:
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:http wlc
-> lxweb1-stage:http Local 0 7 14317
-> lxweb2-stage:http Route 1 13 13888
a few minutes minutes later:
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:http wlc
-> lxweb1-stage:http Local 0 12 14304
-> lxweb2-stage:http Route 1 8 13902
Running ipvsadm -Lnc | grep -v FIN_WAIT shows, that there are only a few
established connections
and some SYN_RECV. Repeating this command after a few seconds also makes clear,
that there are no ports
being reused from the ESTABLISHED-connections. So I have no idea why there are
still active connections on the
server with weight 0.
Any hint is appreciated
Thanks very much for your effort
Best regards
Tim
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