>
>
> When you disable keep-alive connections, does it change anything w.r.t. a
> number of CLOSE_WAIT connections?
>
>
Well, I cannot always reproduce the problem, the last time it ran for 12
hours before crashing. Note that this is production server so it doesn't
make sense for me to run "experiments against the real user base".
Currently the webserver is running with modified configuration, which
includes keep-alive max requests to 20, connection time out to 15 seconds
and this is how number of connections did look like recently:
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
105 ESTABLISHED
1 FIN_WAIT1
42 FIN_WAIT2
2 LAST_ACK
10 LISTEN
4 SYN_RECV
112 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
102 ESTABLISHED
1 FIN_WAIT1
33 FIN_WAIT2
2 LAST_ACK
10 LISTEN
4 SYN_RECV
123 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
88 ESTABLISHED
1 FIN_WAIT1
20 FIN_WAIT2
2 LAST_ACK
10 LISTEN
8 SYN_RECV
137 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -a | grep "CLOSE_WAIT" | wc -l
0
root_at_lvps176-28-13-94:~# netstat -a | grep "CLOSE_WAIT" | wc -l
0
root_at_lvps176-28-13-94:~# netstat -a | grep "CLOSE_WAIT" | wc -l
2
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
2 CLOSE_WAIT
72 ESTABLISHED
2 FIN_WAIT1
39 FIN_WAIT2
10 LISTEN
2 SYN_RECV
110 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
35 ESTABLISHED
7 FIN_WAIT2
10 LISTEN
31 SYN_RECV
88 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
1 CLOSE_WAIT
70 ESTABLISHED
26 FIN_WAIT2
1 LAST_ACK
10 LISTEN
18 SYN_RECV
88 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
71 ESTABLISHED
2 FIN_WAIT1
28 FIN_WAIT2
10 LISTEN
6 SYN_RECV
128 TIME_WAIT
root_at_lvps176-28-13-94:~#
OK, now checking with max request per keep alive connection set to 1:
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
28 ESTABLISHED
1 FIN_WAIT1
3 FIN_WAIT2
10 LISTEN
5 SYN_RECV
241 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
17 ESTABLISHED
2 FIN_WAIT1
5 FIN_WAIT2
10 LISTEN
5 SYN_RECV
250 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
1 CLOSING
30 ESTABLISHED
9 FIN_WAIT2
10 LISTEN
5 SYN_RECV
267 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
29 ESTABLISHED
6 FIN_WAIT1
15 FIN_WAIT2
10 LISTEN
5 SYN_RECV
221 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
26 ESTABLISHED
8 FIN_WAIT1
16 FIN_WAIT2
10 LISTEN
6 SYN_RECV
227 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
27 ESTABLISHED
3 FIN_WAIT1
19 FIN_WAIT2
10 LISTEN
10 SYN_RECV
183 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
1 CLOSE_WAIT
21 ESTABLISHED
4 FIN_WAIT1
21 FIN_WAIT2
10 LISTEN
10 SYN_RECV
196 TIME_WAIT
root_at_lvps176-28-13-94:~# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c
1 CLOSE_WAIT
32 ESTABLISHED
4 FIN_WAIT1
15 FIN_WAIT2
10 LISTEN
7 SYN_RECV
239 TIME_WAIT
Looks worser. Around ~200 (oscillating) connections in TIME_WAIT state.
When not using keep-alive many connections are created and dropped and
sometimes connection can stay in TIME_WAIT for 240ms. It's easy to go out
of network sockets, it seems.
Thanks.
>
> WBR,
> Alexey.
>
>
>
> Hm, I've seen one problem with the Virtuozzo server in the log:
> quotaugidlimit
> Number of user/group IDs allowed for the Container internal disk quota. If
> set to 0, UID/GID quota will not be enabled.
>
> This is set to limit 2000, but I don't understand what it has with
> files, it shall be number of UID/GIDs, and at the moment is has been steady
> at 43 at VPS.
> Perhaps these are problem with Virtuozzo setup but it has to be proven
> somehow.
>
>
>
> --
> Mladen Adamovic
> Numbeo
> Drziceva 9, 11120 Belgrade-Zvezdara, Serbia
> (Business Registration Number 62612240)
> Tel. +381-66-058-595
> email: mladen.adamovic_at_gmail.com
> web: http://www.numbeo.com
>
>
>
--
Mladen Adamovic
Numbeo
Drziceva 9, 11120 Belgrade-Zvezdara, Serbia
(Business Registration Number 62612240)
Tel. +381-66-058-595
email: mladen.adamovic_at_gmail.com
web: http://www.numbeo.com