Problem: The communication via mod_jk between Apache and Tomcat appears
to suddenly become "exhausted" and cease to be available.
Versions:
apache-tomcat-5.5.23.tar.gz
httpd-2.0.59.tar.gz
tomcat-connectors-1.2.21-src.tar.gz
managerx-5.5-1.7.2
CentOS 4.6 (final)
Symptom:
Apache suddenly reports that the "service is unavailable" when trying to
serve a context from Tomcat.
Frequency:
Generally about once a month. It also can happen quicker if ManagerX
is used with any frequency. I have about 10 different webapps running.
Restarting Tomcat does nothing, Restarting both Apache and Tomcat does
nothing.. ONLY rebooting the machine will get everything back working.
Possibly related information:
netstat -np --tcp reports dozens of "dead" connections to port 8009,
like the following samples: (count in parens to save space here):
tcp 0 0 127.0.0.1:8009
127.0.0.1:48461 SYN_RECV - (13)
tcp 0 6 127.0.0.1:48459
127.0.0.1:8009 FIN_WAIT1 - (3)
tcp 6 0 ::ffff:127.0.0.1:8009
::ffff:127.0.0.1:48191 CLOSE_WAIT - (50)
and NO established connections even when attempting to access a service
on Tomcat
I attempted to work on various settings in the worker.properties file
under the assumption that this is the key area to try and solve the
problem based on a number of messages here and at other venues.
I'm assuming I still do not have it right, but have exhausted my
understanding of the causes..
worker.properties:
worker.list=ajp13
worker.ajp13.port=8009
worker.ajp13.host=localhost
worker.ajp13.type=ajp13
worker.ajp13.cachesize=30
worker.ajp13.socket_timeout=120
worker.ajp13.connection_pool_timeout=600
worker.ajp13.connect_timeout=7000
worker.ajp13.prepost_timeout=7000
worker.ajp13.reply_timeout=60000
worker.ajp13.recycle_timeout=120
worker.ajp13.retries=3
Anyone have some suggestions as to how to solve this problem.. It is
rendering my production machines nearly useless..
Thank You!
John..
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