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From Leon Brouwers <le...@gx.nl>
Subject RE: Tomcats stops on Apache restart
Date Tue, 07 Apr 2009 06:21:35 GMT
Hello Rainer,

Our scripts doesn't guess the pid. One of the script in question has the following lines:

	PID_FILE=/vol/www/server/logs/httpd.pid	
	...

	# Restart the httpd to build new logfiles
	kill -HUP `cat $PID_FILE`

This file only contains one pid which is het main httpd process.

host * ~ > cat /vol/www/server/logs/httpd.pid
4351

host * ~ > ps auxww| grep httpd
root      4351  0.0  0.0 33484 4692 ?        Ss   Apr03   0:00 /vol/www/server/bin/httpd
www       4607  0.0  0.0 35800 5040 ?        S    Apr06   0:01 /vol/www/server/bin/httpd
www       8796  0.0  0.0 33648 4664 ?        S    00:05   0:00 /vol/www/server/bin/httpd
....

The other way we start apache is thru the apachectl script which also doesn't guess the PID
but just calls the httpd binary with a "-k restart" argument.

So I don't think the problem is somewhere in the way we restart apache. Do you have any other
ideas on how to debug this?

Groeten Leon

--
Leon Brouwers
System Engineer

GX
open for business

t: +31(0)24 - 388 82 61
f: +31(0)24 - 388 86 21
e: leonb@gx.nl

KvK: 10044410

> -----Original Message-----
> From: Rainer Jung [mailto:rainer.jung@kippdata.de]
> Sent: Tuesday, April 07, 2009 0:22
> To: Tomcat Users List
> Subject: Re: Tomcats stops on Apache restart
> 
> On 01.04.2009 09:46, Leon Brouwers wrote:
> > Hello,
> >
> > We have a large number of tomcats (5.5.26) on serveral servers. These
> > tomcats communicate with a apache httpd on the same server using
> > mod_jk (1.2.26). They all work fine until I restart apache httpd.
> > Then randomly and certainly not all the time a tomcat stops working.
> > Seeing the time the tomcat shuts down matches the time apache was
> > restarted it seems to lead to the conclusion that the two events are
> > related. For that reason I have patched my tomcats to be able so see
> > with it's being stopped.
> >
> > I have changed (source 1.2.26)
> >
> container/catalina/src/share/org/apache/catalina/core/StandardService.j
> ava
> >
> >
> On line 483 I have added a:
> > Thread.dumpStack();
> >
> > This gives me the following in the catalina.out during a httpd
> > restart:
> >
> > java.lang.Exception: Stack trace at
> > java.lang.Thread.dumpStack(Thread.java:1158) at
> >
> org.apache.catalina.core.StandardService.stop(StandardService.java:483)
> >
> >
> at
> org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
> > at org.apache.catalina.startup.Catalina.stop(Catalina.java:602) at
> >
> org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.
> java:645)
> >
> >
> Apr 1, 2009 12:05:16 AM org.apache.catalina.core.StandardService stop
> > INFO: Stopping service WebManager Apr 1, 2009 12:05:16 AM
> > org.apache.catalina.core.StandardWrapper unload INFO: Waiting for 4
> > instance(s) to be deallocated Apr 1, 2009 12:05:17 AM
> > org.apache.catalina.core.StandardWrapper unload INFO: Waiting for 4
> > instance(s) to be deallocated Apr 1, 2009 12:05:18 AM
> > org.apache.catalina.core.StandardWrapper unload INFO: Waiting for 4
> > instance(s) to be deallocated
> >
> > What could be the reason the ShutdownHook is called? The apache
> > restart happens thru a "kill -HUP" on the apache httpd main PID. So
> > no signals should be sent to tomcat.
> 
> There is no technical reason for Tomcat to shut down, when you stop
> Apache. I woiuld guess, the way you retrieve the PID for Apache gives
> you multiple PIDs including the Tomcat PID. A normal kill on the Tomcat
> java process will call the shutdown hook.
> 
> Make your script or whatever you use output the PIDs it kills and
> check,
> to which processes they belong.
> 
> Regards,
> 
> Rainer
> 
> 
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