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Need some help understanding the effect of wlc, lblc, and persistent.
In our environment, the following realserver configuration in ldirectord
results in pretty even load balancing.
# Virtual Server for tomcat(site103), Outside to Inside
virtual=192.168.5.100:3103
real=192.168.10.64:3103 masq
real=192.168.10.63:3103 masq
service=http
request="/mobiledoc/jsp/catalog/xml/CheckDBConnection.jsp"
receive="success"
scheduler=wlc
protocol=tcp
checktype=3
persistent=15
Here's the output of ipvsadm -Ln
TCP 192.168.5.100:3103 wlc persistent 15
-> 192.168.10.64:3103 Masq 1 24 15
-> 192.168.10.63:3103 Masq 1 23 22
Whereas the following config results in very uneven load balancing.
# Virtual Server for tomcat(site077), Outside to Inside
virtual=192.168.5.100:3077
real=192.168.10.64:3077 masq
real=192.168.10.63:3077 masq
service=http
request="/mobiledoc/jsp/catalog/xml/CheckDBConnection.jsp"
receive="success"
scheduler=lblc
protocol=tcp
checktype=3
persistent=360
Here's the outpuut of ipvsadm -Ln
TCP 192.168.5.100:3077 lblc persistent 360
-> 192.168.10.63:3077 Masq 1 16 9
-> 192.168.10.64:3077 Masq 1 1 0
Why is the second one so imbalanced? There are probably 20 computers using the
second one, so about half of them should be going to each realserver. Once they
connect to a realserver, the connection should persist for at least 360
seconds. But that should not result in such a disparity in the number of
connections going to each RS should it?
Wait... if the customer is behind NAT, and all of their workstations appear to
be the same source IP, I guess it would cause this behavior?
--
Eric Robinson
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