[Freeipa-devel] [PATCH] 0001 Ensure that Apache is running in Prefork mode

[Adam Young]

On 11/15/2010 05:21 AM, Jan Zelený wrote:
> Jan Zeleny<jzeleny at redhat.com>  wrote:
>    
>> Rob Crittenden<rcritten at redhat.com>  wrote:
>>      
>>> Jan Zelený wrote:
>>>        
>>>> Rob Crittenden<rcritten at redhat.com>   wrote:
>>>>          
>>>>> Jan Zelený wrote:
>>>>>            
>>>>>> I tried one other solution, but this approach was recommended to me
>>>>>> by Pavel. It seems to be working fine. If you don't agree with the
>>>>>> concept (detection per request), I can present you the original one.
>>>>>>
>>>>>> https://fedorahosted.org/freeipa/ticket/252
>>>>>>
>>>>>> Jan
>>>>>>              
>>>>> nack. I think we need some logging to say "IPA does not work with the
>>>>> threaded MPM, use the pre-fork MPM" or something like that.
>>>>>
>>>>> Otherwise it is going to silently fail and users will have no idea
>>>>> why.
>>>>>            
>>>> I added logging as you requested. I'm still not quite sure how does the
>>>> logging work exactly, but as I understand it, this way it should be ok.
>>>>
>>>> Jan
>>>>          
>>> nack, I can still run httpd.worker and serve IPA requests.
>>>
>>> We do things to the environment so we need to be sure that each request
>>> is isolated from all others which is why we want to run in multi-process
>>> mode.
>>>
>>> rob
>>>        
>> I based that patch on WSGI specification, which says:
>>
>> "This value should evaluate true if the application object may be
>> simultaneously invoked by another thread in the same process, and should
>> evaluate false otherwise."
>>
>> I didn't realize that this condition may be evaluated as false even when
>> running multiple threads.
>>
>> That means I have to abandon this approach and try the original one. I'm
>> going to sync the patch I have prepared with the current HEAD and I'll
>> send it ASAP.
>>      
> Ok, so I've hit a small complication and I had to update the patch, so the
> detection is as robust as possible. This patch is working in Fedora
> environment, where the packaging of httpd is ... well ... strange at least.
>
> The only situation it isn't handling 100% well is the case when 2 different
> Apache servers are running. But since that's not common case and I can't think
> of a way to detect which instance is running current WSGI script, the script
> just doesn't allow such situation.
>
> Jan
>    
>
>
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ACK and pushed to master
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