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I've setup several a few different clusters this week on our test servers and I
have noticed that there are a lot of lingering connections that are marked as
open on some of the real servers. I have a clamsmtpd cluster, spamassassin
cluster, and a mysql cluster in place.
The clamsmtpd cluster is ranging somewhere in the ~240 established connections
per server. On the calling servers there are two. Coincidentally, there have
been about 500 requests per server total in the last 48 hours per server, thus
50% of the connections are still appearing open. The big concern here is that
production has this number per minute (not ever 48 hours).
I had a similar issue with mysql but I dropped the idle connection timeout to
15 minutes and it stabilized. Any ideas on how to resolve these connections
with the other services?
Ipvsadm -Sn
-A -t 10.80.55.11:3917 -s wlc
-a -t 10.80.55.11:3917 -r 10.80.50.2:3917 -m -w 100
-a -t 10.80.55.11:3917 -r 10.80.50.3:3917 -m -w 100
-A -t 10.80.55.13:5847 -s wlc
-a -t 10.80.55.13:5847 -r 10.80.51.3:5847 -m -w 100
-a -t 10.80.55.13:5847 -r 10.80.51.2:5847 -m -w 100
Output from netstat -atunepn
tcp 0 0 10.80.51.2:5847 10.80.91.15:53714
ESTABLISHED 500 23388 1843/perl
--rate
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port CPS InPPS OutPPS InBPS OutBPS
-> RemoteAddress:Port
TCP 10.80.55.11:3917 0 2 2 153 1135
-> 10.80.50.2:3917 0 1 1 111 667
-> 10.80.50.3:3917 0 0 1 42 468
TCP 10.80.55.13:5847 0 0 0 0 0
-> 10.80.51.3:5847 0 0 0 0 0
-> 10.80.51.2:5847 0 0 0 0 0
--stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Conns InPkts OutPkts InBytes OutBytes
-> RemoteAddress:Port
TCP 10.80.55.11:3917 80577 1141313 1149588 143804K 562393K
-> 10.80.50.2:3917 40248 571893 575238 72416158 280880K
-> 10.80.50.3:3917 40329 569420 574350 71388368 281512K
TCP 10.80.55.13:5847 834 6475 4290 1590616 354409
-> 10.80.51.3:5847 440 3376 2255 825578 185876
-> 10.80.51.2:5847 394 3099 2035 765038 168533
All of the OS's are CentOS 5.4 (current updates).
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