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From André Warnier ...@ice-sa.com>
Subject Re: Tomcat is not serving requests - but not crashed...
Date Fri, 10 Apr 2009 16:40:38 GMT
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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