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Posted to users@tomcat.apache.org by kegliuz <eg...@click2sell.eu> on 2009/04/10 17:57:56 UTC
Tomcat is not serving requests - but not crashed...
Hello guys,
We are running a Tomcat 5.5 version through proxy_ajp mode via a regular
Apache webserver.
Within last 2 weeks we had 2 strange downtimes of our system. Our
application is running on Tomcat 5.5.
************
1 CASE
One morning I woke up and noticed our website is down. I logged into the
server and checked for running processes.
The servers load was around 4% (while normally it's around 1%). I checked
Tomcat and it was still running, however, the webserver did not respond to
any queries. The browser was unable to load our website.
So I tried to restart Tomcat:
1) to stop the service
and then
2) start it.
When I ran a command: service tomcat stop - the Tomcat tried to shut down.
However it stopped responding... No status on command line, nothing. It
looked like the server halted. So I had to re-login to the server once again
and then again to run the same command to stop tomcat.
Tomcat started to respond only the 2nd time and it stopped.
Then I ran a command to start tomcat: service tomcat start
Tomcat did not start for the first time. Well, it started, however, it did
not respond.
So I had to stop it once again and then ran a start command once again to
get it up and running.
This time Tomcat started successfully and the application started to work.
However, the question is: who caused the problem with Tomcat not responding?
It did not crash, however, the web server was no functioning and unable to
process requests.
I checked our ping software's logs to see for a downtime and noticed that
downtime started to appear something like this:
5 minute intervals
down...
down...
OK!
OK!
down...
OK!
down...
down...
down...
down...
down...
until i finally restarted the server.
Tomcat did not fully crashed, however, it was not serving the requests.
*************
2 CASE
*************
This week I woke up again in the morning and I noticed that Tomcat is
serving everything really slow... It was taking 2 minutes or so to load the
website, however, this time it was serving (at least!).
I went to restart Tomcat and application this time again and got the same
issues as described in CASE 1. Not responding, etc.
I had to stop tomcat, relogin, stop it again, then start it, stop it and
finally start it again and it started working.
So my question: what should we do in order to find a reason what's causing
these Tomcat's downtimes? How to prevent them?
We tried checking all tomcats logs, etc. but did not find any real problems.
Please, help us to identify the problems so we could fix it... Any
suggestions?
Thank you in advance!
Sincerely,
Keglius
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RE: Tomcat is not serving requests - but not crashed...
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: kegliuz [mailto:egidijus@click2sell.eu]
> Subject: Tomcat is not serving requests - but not crashed...
>
> So my question: what should we do in order to find a reason what's
> causing these Tomcat's downtimes?
What happens if you try accessing Tomcat directly? (Assuming you have an HTTP connector configured.)
I'd first poke around the problematic JVM with JConsole. You may find you're out of heap space, threads are deadlocked, one thread is in a loop, etc. If the problems do appear to be heap related, turn on -verbose:gc and see what's happening (and when it's happening). Make sure you have enough RAM to support the configured heap plus the rest of the process space; if you don't, you could be thrashing pages in and out.
- Chuck
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RE: Tomcat is not serving requests - but not crashed...
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Martin Gainty [mailto:mgainty@hotmail.com]
> Subject: RE: Tomcat is not serving requests - but not crashed...
>
> Please configure Tomcat for logging and restart TC
> http://tomcat.apache.org/tomcat-5.5-doc/logging.html
Note that Tomcat is *always* configured for some level of logging; the above link is primarily for when you want to use a different form of logging.
If you want to change the logging levels, simply update conf/logging.properties; do not rebuild Tomcat.
- Chuck
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RE: Tomcat is not serving requests - but not crashed...
Posted by Martin Gainty <mg...@hotmail.com>.
Please configure Tomcat for logging and restart TC
http://tomcat.apache.org/tomcat-5.5-doc/logging.html
Once the exceptions are noted in %TOMCAT_HOME%/logs
please display the contents of the log so we can be of further assistance
Thanks,
Martin
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> Date: Sat, 11 Apr 2009 07:27:04 -0700
> From: egidijus@click2sell.eu
> To: users@tomcat.apache.org
> Subject: Re: Tomcat is not serving requests - but not crashed...
>
>
> Here are some configuration details:
>
> Server: Linux CentOS Linux version 2.6.18-8.1.14.el5PAE
> (mockbuild@builder7.centos.org) (gcc version 4.1.1 20070105 (Red Hat
> 4.1.1-52))
> Server version: Apache Tomcat/5.5.23
> Server built: Mar 5 2007 08:25:04
> Server number: 5.5.23.0
> OS Name: Linux
> OS Version: 2.6.18-8.1.14.el5PAE
> JVM Version: 1.5.0_12-b04
> JVM Vendor: Sun Microsystems Inc.
>
> Apache serves as main web server in front of tomcat, apache is communicating
> with tomcat via AJP protocol.
>
> Tomcat process running with the following command:
> /usr/java/jdk/bin/java -Xms1024m -Xmx2048m -Djava.awt.headless=true
> -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
> -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties
> -Djava.endorsed.dirs=/usr/local/tomcat/common/endorsed -classpath
> :/usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/commons-logging-api.jar
> -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat
> -Djava.io.tmpdir=/usr/local/tomcat/temp
> org.apache.catalina.startup.Bootstrap start
>
>
> Bugzilla from gsexton@Mhsoftware.com wrote:
> >
> > Your description is pretty short of information. It's unlikely you will
> > get any useful comments. If you would like help, you'll have to provide
> > more information.
> >
> > Which version of 5.5?
> >
> > What JVM?
> >
> > What Operating System? If Linux, what Kernel? If Windows, what version
> > and Service Packs?
> >
> > What command line arguments are you using for the JVM?
> >
> > kegliuz wrote:
> >> Hello guys,
> >>
> >> We are running a Tomcat 5.5 version through proxy_ajp mode via a regular
> >> Apache webserver.
> >>
> >> Within last 2 weeks we had 2 strange downtimes of our system. Our
> >> application is running on Tomcat 5.5.
> >>
> >> ************
> >> 1 CASE
> >>
> >> One morning I woke up and noticed our website is down. I logged into the
> >> server and checked for running processes.
> >> The servers load was around 4% (while normally it's around 1%). I checked
> >> Tomcat and it was still running, however, the webserver did not respond
> >> to
> >> any queries. The browser was unable to load our website.
> >>
> >> So I tried to restart Tomcat:
> >> 1) to stop the service
> >> and then
> >> 2) start it.
> >>
> >> When I ran a command: service tomcat stop - the Tomcat tried to shut
> >> down.
> >> However it stopped responding... No status on command line, nothing. It
> >> looked like the server halted. So I had to re-login to the server once
> >> again
> >> and then again to run the same command to stop tomcat.
> >>
> >> Tomcat started to respond only the 2nd time and it stopped.
> >>
> >> Then I ran a command to start tomcat: service tomcat start
> >> Tomcat did not start for the first time. Well, it started, however, it
> >> did
> >> not respond.
> >> So I had to stop it once again and then ran a start command once again to
> >> get it up and running.
> >> This time Tomcat started successfully and the application started to
> >> work.
> >>
> >>
> >> However, the question is: who caused the problem with Tomcat not
> >> responding?
> >> It did not crash, however, the web server was no functioning and unable
> >> to
> >> process requests.
> >>
> >> I checked our ping software's logs to see for a downtime and noticed that
> >> downtime started to appear something like this:
> >>
> >> 5 minute intervals
> >> down...
> >> down...
> >> OK!
> >> OK!
> >> down...
> >> OK!
> >> down...
> >> down...
> >> down...
> >> down...
> >> down...
> >> until i finally restarted the server.
> >>
> >> Tomcat did not fully crashed, however, it was not serving the requests.
> >> *************
> >> 2 CASE
> >> *************
> >>
> >> This week I woke up again in the morning and I noticed that Tomcat is
> >> serving everything really slow... It was taking 2 minutes or so to load
> >> the
> >> website, however, this time it was serving (at least!).
> >>
> >> I went to restart Tomcat and application this time again and got the same
> >> issues as described in CASE 1. Not responding, etc.
> >> I had to stop tomcat, relogin, stop it again, then start it, stop it and
> >> finally start it again and it started working.
> >>
> >>
> >> So my question: what should we do in order to find a reason what's
> >> causing
> >> these Tomcat's downtimes? How to prevent them?
> >> We tried checking all tomcats logs, etc. but did not find any real
> >> problems.
> >>
> >> Please, help us to identify the problems so we could fix it... Any
> >> suggestions?
> >>
> >> Thank you in advance!
> >>
> >> Sincerely,
> >> Keglius
> >
> > --
> > George Sexton
> > MH Software, Inc.
> > Voice: +1 303 438 9585
> > URL: http://www.mhsoftware.com/
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Tomcat-is-not-serving-requests---but-not-crashed...-tp22990181p23001710.html
> Sent from the Tomcat - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
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Re: Tomcat is not serving requests - but not crashed...
Posted by kegliuz <eg...@click2sell.eu>.
Here are some configuration details:
Server: Linux CentOS Linux version 2.6.18-8.1.14.el5PAE
(mockbuild@builder7.centos.org) (gcc version 4.1.1 20070105 (Red Hat
4.1.1-52))
Server version: Apache Tomcat/5.5.23
Server built: Mar 5 2007 08:25:04
Server number: 5.5.23.0
OS Name: Linux
OS Version: 2.6.18-8.1.14.el5PAE
JVM Version: 1.5.0_12-b04
JVM Vendor: Sun Microsystems Inc.
Apache serves as main web server in front of tomcat, apache is communicating
with tomcat via AJP protocol.
Tomcat process running with the following command:
/usr/java/jdk/bin/java -Xms1024m -Xmx2048m -Djava.awt.headless=true
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties
-Djava.endorsed.dirs=/usr/local/tomcat/common/endorsed -classpath
:/usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/commons-logging-api.jar
-Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat
-Djava.io.tmpdir=/usr/local/tomcat/temp
org.apache.catalina.startup.Bootstrap start
Bugzilla from gsexton@Mhsoftware.com wrote:
>
> Your description is pretty short of information. It's unlikely you will
> get any useful comments. If you would like help, you'll have to provide
> more information.
>
> Which version of 5.5?
>
> What JVM?
>
> What Operating System? If Linux, what Kernel? If Windows, what version
> and Service Packs?
>
> What command line arguments are you using for the JVM?
>
> kegliuz wrote:
>> Hello guys,
>>
>> We are running a Tomcat 5.5 version through proxy_ajp mode via a regular
>> Apache webserver.
>>
>> Within last 2 weeks we had 2 strange downtimes of our system. Our
>> application is running on Tomcat 5.5.
>>
>> ************
>> 1 CASE
>>
>> One morning I woke up and noticed our website is down. I logged into the
>> server and checked for running processes.
>> The servers load was around 4% (while normally it's around 1%). I checked
>> Tomcat and it was still running, however, the webserver did not respond
>> to
>> any queries. The browser was unable to load our website.
>>
>> So I tried to restart Tomcat:
>> 1) to stop the service
>> and then
>> 2) start it.
>>
>> When I ran a command: service tomcat stop - the Tomcat tried to shut
>> down.
>> However it stopped responding... No status on command line, nothing. It
>> looked like the server halted. So I had to re-login to the server once
>> again
>> and then again to run the same command to stop tomcat.
>>
>> Tomcat started to respond only the 2nd time and it stopped.
>>
>> Then I ran a command to start tomcat: service tomcat start
>> Tomcat did not start for the first time. Well, it started, however, it
>> did
>> not respond.
>> So I had to stop it once again and then ran a start command once again to
>> get it up and running.
>> This time Tomcat started successfully and the application started to
>> work.
>>
>>
>> However, the question is: who caused the problem with Tomcat not
>> responding?
>> It did not crash, however, the web server was no functioning and unable
>> to
>> process requests.
>>
>> I checked our ping software's logs to see for a downtime and noticed that
>> downtime started to appear something like this:
>>
>> 5 minute intervals
>> down...
>> down...
>> OK!
>> OK!
>> down...
>> OK!
>> down...
>> down...
>> down...
>> down...
>> down...
>> until i finally restarted the server.
>>
>> Tomcat did not fully crashed, however, it was not serving the requests.
>> *************
>> 2 CASE
>> *************
>>
>> This week I woke up again in the morning and I noticed that Tomcat is
>> serving everything really slow... It was taking 2 minutes or so to load
>> the
>> website, however, this time it was serving (at least!).
>>
>> I went to restart Tomcat and application this time again and got the same
>> issues as described in CASE 1. Not responding, etc.
>> I had to stop tomcat, relogin, stop it again, then start it, stop it and
>> finally start it again and it started working.
>>
>>
>> So my question: what should we do in order to find a reason what's
>> causing
>> these Tomcat's downtimes? How to prevent them?
>> We tried checking all tomcats logs, etc. but did not find any real
>> problems.
>>
>> Please, help us to identify the problems so we could fix it... Any
>> suggestions?
>>
>> Thank you in advance!
>>
>> Sincerely,
>> Keglius
>
> --
> George Sexton
> MH Software, Inc.
> Voice: +1 303 438 9585
> URL: http://www.mhsoftware.com/
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Tomcat-is-not-serving-requests---but-not-crashed...-tp22990181p23001710.html
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Re: Tomcat is not serving requests - but not crashed...
Posted by André Warnier <aw...@ice-sa.com>.
George Sexton wrote:
> Your description is pretty short of information. It's unlikely you will
> get any useful comments. If you would like help, you'll have to provide
> more information.
>
> Which version of 5.5?
>
> What JVM?
>
> What Operating System? If Linux, what Kernel? If Windows, what version
> and Service Packs?
>
> What command line arguments are you using for the JVM?
And are you sure that Tomcat is your webserver ?
>
> kegliuz wrote:
>> Hello guys,
>>
>> We are running a Tomcat 5.5 version through proxy_ajp mode via a regular
>> Apache webserver.
>>
>> Within last 2 weeks we had 2 strange downtimes of our system. Our
>> application is running on Tomcat 5.5.
>>
>> ************
>> 1 CASE
>>
>> One morning I woke up and noticed our website is down. I logged into the
>> server and checked for running processes.
>> The servers load was around 4% (while normally it's around 1%). I checked
>> Tomcat and it was still running, however, the webserver did not
>> respond to
>> any queries. The browser was unable to load our website.
>>
>> So I tried to restart Tomcat: 1) to stop the service and then 2) start
>> it.
>>
>> When I ran a command: service tomcat stop - the Tomcat tried to shut
>> down.
>> However it stopped responding... No status on command line, nothing. It
>> looked like the server halted. So I had to re-login to the server once
>> again
>> and then again to run the same command to stop tomcat.
>>
>> Tomcat started to respond only the 2nd time and it stopped.
>>
>> Then I ran a command to start tomcat: service tomcat start
>> Tomcat did not start for the first time. Well, it started, however, it
>> did
>> not respond.
>> So I had to stop it once again and then ran a start command once again to
>> get it up and running.
>> This time Tomcat started successfully and the application started to
>> work.
>>
>>
>> However, the question is: who caused the problem with Tomcat not
>> responding?
>> It did not crash, however, the web server was no functioning and
>> unable to
>> process requests.
>>
>> I checked our ping software's logs to see for a downtime and noticed that
>> downtime started to appear something like this:
>>
>> 5 minute intervals
>> down...
>> down...
>> OK!
>> OK!
>> down...
>> OK!
>> down...
>> down...
>> down...
>> down...
>> down...
>> until i finally restarted the server.
>>
>> Tomcat did not fully crashed, however, it was not serving the requests.
>> *************
>> 2 CASE
>> *************
>>
>> This week I woke up again in the morning and I noticed that Tomcat is
>> serving everything really slow... It was taking 2 minutes or so to
>> load the
>> website, however, this time it was serving (at least!).
>>
>> I went to restart Tomcat and application this time again and got the same
>> issues as described in CASE 1. Not responding, etc.
>> I had to stop tomcat, relogin, stop it again, then start it, stop it and
>> finally start it again and it started working.
>>
>>
>> So my question: what should we do in order to find a reason what's
>> causing
>> these Tomcat's downtimes? How to prevent them?
>> We tried checking all tomcats logs, etc. but did not find any real
>> problems.
>>
>> Please, help us to identify the problems so we could fix it... Any
>> suggestions?
>>
>> Thank you in advance!
>>
>> Sincerely,
>> Keglius
>
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Re: Tomcat is not serving requests - but not crashed...
Posted by George Sexton <gs...@mhsoftware.com>.
Your description is pretty short of information. It's unlikely you will
get any useful comments. If you would like help, you'll have to provide
more information.
Which version of 5.5?
What JVM?
What Operating System? If Linux, what Kernel? If Windows, what version
and Service Packs?
What command line arguments are you using for the JVM?
kegliuz wrote:
> Hello guys,
>
> We are running a Tomcat 5.5 version through proxy_ajp mode via a regular
> Apache webserver.
>
> Within last 2 weeks we had 2 strange downtimes of our system. Our
> application is running on Tomcat 5.5.
>
> ************
> 1 CASE
>
> One morning I woke up and noticed our website is down. I logged into the
> server and checked for running processes.
> The servers load was around 4% (while normally it's around 1%). I checked
> Tomcat and it was still running, however, the webserver did not respond to
> any queries. The browser was unable to load our website.
>
> So I tried to restart Tomcat:
> 1) to stop the service
> and then
> 2) start it.
>
> When I ran a command: service tomcat stop - the Tomcat tried to shut down.
> However it stopped responding... No status on command line, nothing. It
> looked like the server halted. So I had to re-login to the server once again
> and then again to run the same command to stop tomcat.
>
> Tomcat started to respond only the 2nd time and it stopped.
>
> Then I ran a command to start tomcat: service tomcat start
> Tomcat did not start for the first time. Well, it started, however, it did
> not respond.
> So I had to stop it once again and then ran a start command once again to
> get it up and running.
> This time Tomcat started successfully and the application started to work.
>
>
> However, the question is: who caused the problem with Tomcat not responding?
> It did not crash, however, the web server was no functioning and unable to
> process requests.
>
> I checked our ping software's logs to see for a downtime and noticed that
> downtime started to appear something like this:
>
> 5 minute intervals
> down...
> down...
> OK!
> OK!
> down...
> OK!
> down...
> down...
> down...
> down...
> down...
> until i finally restarted the server.
>
> Tomcat did not fully crashed, however, it was not serving the requests.
> *************
> 2 CASE
> *************
>
> This week I woke up again in the morning and I noticed that Tomcat is
> serving everything really slow... It was taking 2 minutes or so to load the
> website, however, this time it was serving (at least!).
>
> I went to restart Tomcat and application this time again and got the same
> issues as described in CASE 1. Not responding, etc.
> I had to stop tomcat, relogin, stop it again, then start it, stop it and
> finally start it again and it started working.
>
>
> So my question: what should we do in order to find a reason what's causing
> these Tomcat's downtimes? How to prevent them?
> We tried checking all tomcats logs, etc. but did not find any real problems.
>
> Please, help us to identify the problems so we could fix it... Any
> suggestions?
>
> Thank you in advance!
>
> Sincerely,
> Keglius
--
George Sexton
MH Software, Inc.
Voice: +1 303 438 9585
URL: http://www.mhsoftware.com/
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Re: Tomcat is not serving requests - but not crashed...
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Kaglius,
On 4/10/2009 11:57 AM, kegliuz wrote:
> However, the question is: who caused the problem with Tomcat not responding?
> It did not crash, however, the web server was no functioning and unable to
> process requests.
Do you mean that Tomcat could not process requests, or httpd could not
process them?
> This week I woke up again in the morning and I noticed that Tomcat is
> serving everything really slow... It was taking 2 minutes or so to load the
> website, however, this time it was serving (at least!).
When this kind of thing happens, you should take thread dumps several
seconds apart to see what your application and the JVM are doing. Use
jstack to obtain thread dumps on win32.
> So my question: what should we do in order to find a reason what's causing
> these Tomcat's downtimes? How to prevent them?
> We tried checking all tomcats logs, etc. but did not find any real problems.
Did you find any problems you don't consider "real"? If so, please post
those log messages.
- -chris
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