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From "Yifan (Eric) Jiang" <e.ji...@auckland.ac.nz>
Subject RE: mod_jk problem
Date Mon, 21 May 2007 21:19:10 GMT
Hi Rainer,

Thanks for all your helps. I know that is a very outdated version of
httpd,
But since it is in a production server, and the server for the
authentication of the whole university, so it is unlikely, or it is
impossible for me to do any big change on it. And it is weird, because
it is running completely fine in the test server which is the
replication for the production server. 

So we are trying to reproduce the same error/bug that occurred in the
production server, but unfortunately we still can't reproduce it. Any
idea why?


Thanks

Regards

Eric

-----Original Message-----
From: Rainer Jung [mailto:rainer.jung@kippdata.de] 
Sent: Monday, 21 May 2007 7:26 p.m.
To: Tomcat Users List
Subject: Re: mod_jk problem

Rotating an open log file from outside the using processes is a very bad

idea. The processes in most cases will simply try to use the old log 
file further on (and will run into trouble, after you compressed them
etc.).

Rotating log files for apache can be easily done using the bundles 
rotatelogs (see the Apache httpd documentation).

mod_jk is able to use rotatelogs with JkLogFile as well, and the syntax 
is the same as for the other Apache httpd log files 
("|/pathtorotatelogs/rotatelogs /pathtologfile/logfile OPTIONS").

Since I'm interested in the root of your problem nevertheless, if you 
can reproduce it, try to get a pstack (solaris) or gstack[?] (linux) of 
your running httpd processes, once the problem occurs. In case threads 
are hanging, this will tel us, where they are.

By the way: your httpd is a pretty outdated version. The 2.0 branch is 
at 2.0.59 and there is 2.2.x around for 1.5 years now. (I'm not saying 
such an update will solve your problem, but the other two components are

pretty up to date, so updating your apache would make a good fit).

Regards,

Rainer

Yifan (Eric) Jiang wrote:
> Hi all,
> 
>  
> 
> Not quite sure if this list is the best place to send this question.
But
> I can't find anywhere else to send it to...
> 
>  
> 
> I am trying to install Shibboleth (http://shibboleth.internet2.edu/)
> Identity Provider with Cosign protection on a RedHat Linux production
> server. 
> 
> Well, Shibboleth Identity Provider is a Java Application and is using
> Tomcat as a Java container. Therefore for the user conveniences, I
have
> to load a mod_jk module into Apache in order to build a connection
> between Apache and Tomcat. 
> 
>  
> 
> I am using Apahce2.0.46, mod_jk 1.2.22 and Tomcat 5.5.23. After the
> Shibboleth Identity Provider installation, everything is running
> perfectly fine until the log rotation has been triggered by the cron
job
> at mid-night.
> 
>  
> 
> The cron job has the following configuration:
> 
> 59      23      *       *       *       /usr/local/etc/rotate.log
--move
> --after=/usr/local/etc/rotate.log-after.std /var/log
> 
> 59      23      *       *       *       /usr/local/etc/rotate.log
--move
> --after=/usr/local/etc/rotate.log-apache /var/log/httpd
> 
>  
> 
> So after the log rotation, Apache appears to have some problems to
> restart. It returns a HTTP 500 error to users, and the ssl_error_log
> file has logged a "Premature end of script headers: cosign.cgi" error.
> Therefore it requires the administrator to restart the Apache
manually.
> 
>  
> 
> Before I thought it was caused by Shibboleth and Cosign, so I just
> disable the Cosign module for Apache. However, the error still happens
> on the next day after the log rotation. Then I realised it may be
cause
> by the mod_jk, so I disable the mod_jk module and the Apache is back
to
> normal, even after the log rotation.
> 
>  
> 
> I have not idea what exactly caused this problem, and the log for
> mod_jk, Apache doesn't give me much help. So does anyone know this
> issue? 
> 
>  
> 
> Any information in regards of this would be much appreciated.
> 
>  
> 
> Thanks
> 
>  
> 
> Eric

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