Hallo all,
We are having problems, where aparently Tomcat sort of "hangs" apache. Lets
first discribe the setup:
Server runs IBM AIX 5
Tomcat is version 4.1.27
Apache is version 2.0.47
Java is IBM's own 64 bit JDK 1.4.1
mod_jk2 is used.
We run several virtual hosts on the apache server. There are three instances
of tomcat running, for three different virtual apache hosts. Apache
communicates with these instances on tcp sockets, using mod_jk2.
Every _monday_ morning I am presented with the following situation.
- The Apache server has stopped accepting connections. The number of daemons
is maxclients +1.
- The Tomcat servers function normally. Connecting with a browser to their
http ports does produce the expected results, within the expected time.
- Restarting one of the tomcat servers solves the problem. The Apache server
becomes "unstuck", and starts accepting connections again. The number of
apache daemons drops to around 20 or so, and that is normal for the load.
I currently run a couple of scripts to watch what happens on the system, as
the logfiles do not give me any clue. I notice that always, somehwere during
Saturday, the number of apache daemons starts to increase, to the point that
the maximum is reached, then it stops. The weird thing is that these servers
are intranet servers, so nobody is actually using them during the weekend. I
find nothing (no accesses) in the logifles.
I ahve no idea where to start on this, what might cause this problem, how to
find out more. Has anyobody here on the list seen similar behaviour? Any hints
on how I might to start finding out what is happening here would be more then
welcome.
Krist van Besien
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Krist van Besien Bern, Switzerland
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