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Posted to dev@tomcat.apache.org by bu...@apache.org on 2006/03/06 22:41:21 UTC
DO NOT REPLY [Bug 38869] - mod_jk does not send keep_alives on solaris 8 or solaris 10
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http://issues.apache.org/bugzilla/show_bug.cgi?id=38869
rainer.jung@kippdata.de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
------- Additional Comments From rainer.jung@kippdata.de 2006-03-06 21:41 -------
It works. I tried with Solaris 10, mod_jk 1.2.15 (!) and apache 2.0.55.
The name of the attribute for a worker in workers.properties file (set by
JkWorkersFile) is socket_keepalive, like in
worker.list=single
worker.single.type=ajp13
worker.single.host=mytomcat
worker.single.port=21109
worker.single.socket_keepalive=1
If I set it like that and connect a httpd process (apache I used 2.0.55) to
tomcat, then I can see in Solaris pfiles:
...
17: S_IFSOCK mode:0666 dev:294,0 ino:47164 uid:0 gid:0 size:0
O_RDWR
SOCK_STREAM
SO_KEEPALIVE,SO_SNDBUF(49152),SO_RCVBUF(49152)
sockname: AF_INET 192.168.0.220 port: 33689
peername: AF_INET 192.168.0.220 port: 21109
I use Solaris 10. Please note "SO_KEEPALIVE", so the socket option is set
correctly. Please very for your setup using pfiles.
Also note, that you should check in your mod_jk.log using JkLogLevel debug or
better trace, that during apache startup you find:
[Mon Mar 06 22:08:43 2006] [3832:0001] [trace] init::jk_ajp13_worker.c (47): enter
[Mon Mar 06 22:08:43 2006] [3832:0001] [trace] ajp_init::jk_ajp_common.c (1879):
enter
[Mon Mar 06 22:08:43 2006] [3832:0001] [debug] ajp_init::jk_ajp_common.c (1895):
setting socket keepalive to 1
...
and during connect:
[Mon Mar 06 22:11:14 2006] [3838:0001] [trace] ajp_send_request::jk_ajp_common.c
(1166): enter
[Mon Mar 06 22:11:14 2006] [3838:0001] [trace]
ajp_connect_to_endpoint::jk_ajp_common.c (856): enter
[Mon Mar 06 22:11:14 2006] [3838:0001] [trace] jk_open_socket::jk_connect.c
(308): enter
[Mon Mar 06 22:11:14 2006] [3838:0001] [debug] jk_open_socket::jk_connect.c
(328): socket TCP_NODELAY set to On
[Mon Mar 06 22:11:14 2006] [3838:0001] [debug] jk_open_socket::jk_connect.c
(341): socket SO_KEEPALIVE set to On
You can check the keep alive interval by:
myapache% ndd -get /dev/tcp tcp_keepalive_interval
7200000
This is the default for Solaris 8, 9 and 10. The unit is milliseconds, so by
default keep alive packets are not send before expiration of 7200 seconds = 2
hours. Maybe someone tuned that parameter on your old system.
I manually set the interval to a very short value to check:
# ndd -set /dev/tcp tcp_keepalive_interval 20000
# ndd -get /dev/tcp tcp_keepalive_interval
20000
After restarting apache and conecting to tomcat I sniffed the connection and voila:
1 22:36:7.66269 myapache -> mytomcat TCP D=21109 S=33730 Push
Ack=1181356454 Seq=256221097 Len=1 Win=49640
2 22:36:7.66288 mytomcat -> myapache TCP D=33730 S=21109
Ack=256221098 Seq=1181356454 Len=0 Win=49561
3 22:36:27.67494 myapache -> mytomcat TCP D=21109 S=33730 Push
Ack=1181356454 Seq=256221097 Len=1 Win=49640
4 22:36:27.67514 mytomcat -> myapache TCP D=33730 S=21109
Ack=256221098 Seq=1181356454 Len=0 Win=49561
5 22:36:47.68717 myapache -> mytomcat TCP D=21109 S=33730 Push
Ack=1181356454 Seq=256221097 Len=1 Win=49640
6 22:36:47.68737 mytomcat -> myapache TCP D=33730 S=21109
Ack=256221098 Seq=1181356454 Len=0 Win=49561
If you need to discuss mod_jk configuration further please use tomcat-users.
Concerning Solaris and TCP-Tuning you should use another appropriate forum.
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