JkShmSize 256

That solved the problem - Thanks to all who replied!

>>
>> Note that the 16th worker config works fine, if specified as part of
>> the 15.
>
> I don't understand, what you mean by specifying a worker as part of
> another worker.
>

I was just saying that the problem wasn't a specific web-app or config - any 16th web-app would do it.

regards

James


Rainer Jung wrote:
> Hi James,
>
> I guess, the size of the shared memory is not big enough.
> You can increase it using the JkShmSize directive for Apache. The value
> is an integer value which is the provided shared memory size in Kilobytes.
>
> During startup with JkLogLevel debug you get messages like:
>
> ... do_shm_open::jk_shm.c (327): Truncated shared memory to 28800
> ... do_shm_open::jk_shm.c (360): Initialized shared memory size=28800
> free=28672 addr=0x2a98f02000
> ... do_shm_open_lock::jk_shm.c (266): Opened shared memory lock
> /var/tmp/install/apache2p/logs/jk-runtime-status.lock
> ... init_jk::mod_jk.c (2562): Initialized
> shm:/var/tmp/install/apache2p/logs/jk-runtime-status
>
> from which you can see, which file system object is used for the shared
> mem and which size is used. Usually the size should be big enough to
> handle 64 workers (including ajp13, load balancers and lb sub workers).
>
> You can check, the size that is being used on your system and then
> double it via JkShmSize and try again. Let us know your results.
>
> One question:
>
> James Masson wrote:
>>
>> Hi,
>>
>> I'm working on creating a pair of Apache mod_jk load balancers for an
>> Tomcat web-app farm.
>>
>> Redhat ES4
>> Server Version:   Apache/2.0.52 (Red Hat)
>> JK Version:   mod_jk/1.2.20
>>
>> apache-tomcat-5.5.20-1
>>
>> Everything works fine, until I exceed 15 load balancing workers on
>> mod_jk, then I get a 500-Internal Server Error, for every web-app.
>>
>> Note that the 16th worker config works fine, if specified as part of
>> the 15.
>
> I don't understand, what you mean by specifying a worker as part of
> another worker.
>
> Regards,
>
> Rainer
>
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