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Hi list,
I am seeing some odd connection behaviour between LVS and clients. I regulary
see that the client->LVS connection count is higher from the client side than
when I look at it on the LVS.
For example, on the client side here's what I see:
client:~# netstat -antp | grep 389
tcp 197 0 10.10.5.247:32986 10.10.3.169:389 ESTABLISHED
1567/nslcd
tcp 0 0 10.10.5.247:33343 10.10.3.169:389 ESTABLISHED
1567/nslcd
tcp 0 0 10.10.5.247:33250 10.10.3.169:389 ESTABLISHED
1567/nslcd
tcp 0 0 10.10.5.247:32993 10.10.3.169:389 ESTABLISHED
1567/nslcd
tcp 0 0 10.10.5.247:60957 10.10.3.169:389 ESTABLISHED
1567/nslcd
And at the same time on the lvs I see:
lb1:~# ipvsadm -Lnc | grep 10.10.5.247
TCP 08:35 ESTABLISHED 10.10.5.247:33250 10.10.3.169:389 10.10.5.34:389
TCP 08:35 ESTABLISHED 10.10.5.247:33343 10.10.3.169:389 10.10.5.34:389
TCP 06:16 ESTABLISHED 10.10.5.247:32993 10.10.3.169:389 10.10.5.38:389
I am trying to understand why the client has 5 established connections to LVS,
while the LVS only has 3 open to the client. Is this normal behaviour?
I should add that I see this regularly on many systems.
* The clients are all running Ubuntu (10.04 or 12.04) with nslcd 0.7.2
* The LVS is running Ubuntu 12.04, Kernel 3.2.0-24-virtual, ipvsadm
1:1.25.clean-1ubuntu5
Thanks in advance,
--
Khosrow
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