Mladen,
Thank you for this excellent information, it sounds like exactly what I
needed- some context for those parameters.
One last question with regards to setting connectionTimeout="xx" in my
server.xml. I'm using tomcat5.0.28- judging by the docs at
http://tomcat.apache.org/tomcat-5.0-doc/config/ajp.html
...that parameter doesn't exist (it does exist, though, in the 5.5
docs). Am I just SOL on that parameter because I'm using 5.0.28?
Many thanks again...
/kurt
Mladen Turk wrote:
Kurt Overberg wrote:
It seems that the number of connections between the apache and the
tomcats just start escalating for some reason. mod_jk.log shows a ton
(>50) of these errors:
Hard to tell without httpd.conf and server.xml.
Two things you should know:
1. MaxClients shuld be <= maxThreads
2. If you have MaxRequestsPerChild != 0 you must
set connectionTimeout in server.xml
If you have connectionTimeout in server.xml add connect_timeout=60000
and prepost_timeout=60000 to each worker (except loadbalancer).
Also if you have a firewall between Apache Httpd and Tomcat use
connect_timeout and prepost_timeout because the firewall can
cut the inactive connections. Also add connectionTimeout that
will reflect the firewall cut time.
Anyhow AJP13 protocol is persistent, so if any part can close
the socket (simple restart) the other one will not know about
that, the socket will be half-closed and the connection count
will rise until one part breaks down (usually Tomcat).
To deal with that issues add
connectionTimeout="600000" (10 minutes) to server.xml
and ...
worker.xxx.connect_timeout=60000 (1 minute)
worker.xxx.prepost_timeout=60000 (1 minute)
The later will force so called PING/PONG packets to be
send between web server and Tomcat. If the response packet
is not received within the specified time the socket will
be closed and the new one will be created.
Regards,
Mladen.
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