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: le...@gx.nl KvK: 10044410 > -----Original Message----- > From: Rainer Jung [mailto:rainer.j...@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 > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org