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From Yu Kikuchi <kikuchi...@jp.fujitsu.com>
Subject Re: [users@httpd] mod_proxy_ajp failed to connect infrequently
Date Wed, 08 Dec 2010 02:42:08 GMT
Hi All.

I decided to use mod_jk instead of mod_proxy_ajp.
Then the error was never happened.

I might ask some questions about mod_proxy_ajp's default setting later.
Thanks in advance.

Regards,


(2010/11/02 18:13), Yu Kikuchi wrote:
> Thank you for your advice.
>
> This is the part of config file.
> I'm creating some virtual hosts and they are much the same configurations.
> ----------------------------------------
> Listen 8010
> NameVirtualHost xxx.xxx.19.40:8010
> ServerName xxx.xxx.19.40:8008
> :
> <VirtualHost xxx.xxx.19.40:8010>
> CustomLog "/opt/httpd/logs/access_8010_log" common
> ErrorLog "/opt/httpd/logs/error_8010_log"
> <Location /api>
> ProxyPass ajp://xxx.xxx.19.40:8009/api
> </Location>
> </VirtualHost>
> :
> Timeout 300
> KeepAlive off
> KeepAliveTimeout 15
> MaxKeepAliveRequests 100
> ----------------------------------------
> Are there any the suspicious configuration?
>
>
> (2010/10/31 4:13), Igor Galić wrote:
>>
>> ----- "Yu Kikuchi"<kikuchi.yu@jp.fujitsu.com> wrote:
>>
>>> Hi All.
>>>
>>> The error_log (debug) is attached.
>>
>> Hi,
>>
>> I think you really need to post your config.
>> Your errorlog suggests that you're doing something entirely wrong.
>>
>>> I understood "(120006) error" means Apache wasn't able to receive the
>>> headers of the response from the backend server.
>>> But I don't know why the headers didn't return and I want any opinions
>>> about the reason.
>>> Please teach me how to know the problem.
>>>
>>> Best regards,
>>>
>>>
>>> (2010/10/12 11:07), Kikuchi Yu wrote:
>>>> Thanks for getting back to me.
>>>>
>>>> > Could it be a timeout while waiting for the reply? Add "%D" to
>>> your LogFormat and check, how long those requests take.
>>>>
>>>> The following is an Apache's access_log when the HTTP 503 error
>>> occured.
>>>> It seems the request took only "42ms" so I think it's not because of
>>> a timeout.
>>>>
>>>> xxx.xxx.xxx.xxx - - [09/Aug/2010:03:38:32 +0900] "GET /api/alive.jsp
>>> HTTP/1.1" 503 2366 0 42324
>>>>
>>>> > I didn't understand the "the errors disappeared instead of
>>> cping/cpong retry occurrence" part of your question.
>>>>
>>>> I'm sorry I'm not good at using English well.
>>>>
>>>> It's my understanding that:
>>>> 1. "ping" option gets Apache to check the connection to the
>>> backend.
>>>> 2. If the first CPing/CPong check doesn't succeed, it will
>>> reestablish a new connection to the backend and run one more
>>>> CPing/CPong.
>>>>
>>>> When I set "ping=1" option to ProxyPass directive, Apache failed the
>>> first CPing/CPong check, but succeeded at
>>>> connecting to backend by the second CPing/CPong.
>>>> So HTTP 500/503 error didn't occur.
>>>>
>>>> I wonder if the connection will break instantaneously(within 1
>>> second).
>>>> Would you give me any comments about this phenomenon?
>>>>
>>>>
>>>> (2010/10/08 20:19), Rainer Jung wrote:
>>>>> On 08.10.2010 09:33, Yu Kikuchi wrote:
>>>>>> My environment is Apache 2.2.11 and JBoss AS 5.0.0.
>>>>>> There were no messages in JBoss's access log when the error
>>> occured.
>>>>>>
>>>>>> I had changed the setting to use "mod_proxy_http" the day before
>>> yesterday,
>>>>>> then not HTTP 503 error but 502 error occured.
>>>>>> Are anybody onto something about this error?
>>>>>>
>>>>>> Are there any ideas to pursue the exact cause of it?
>>>>>>
>>>>>>
>>>>>> (2010/10/07 18:50), Yu Kikuchi wrote:
>>>>>>> Hello.
>>>>>>>
>>>>>>> Apache wrote such as following messages into error_log and
>>> returned HTTP 500/503 error infrequently.
>>>>>>>
>>>>>>> [error] (104)Connection reset by peer: ajp_ilink_receive() can't
>>> receive header
>>>>>>> [error] ajp_read_header: ajp_ilink_receive failed
>>>>>>> [error] (120006)APR does not understand this error code: proxy:
>>> read response failed from xxx.xxx.xxx.xxx:8009
>>>>>>> (xxx.xxx.xxx.xxx)
>>>>>>>
>>>>>>> I have installed Apache and JBoss Application Server into the
>>> same server.
>>>>>>> I suspected mod_proxy_ajp caused the errors because JBoss hasn't
>>> logged any messages and left indications of abort.
>>>>>>>
>>>>>>> After the setting of "ping" options, the errors disappeared
>>> instead of cping/cpong retry occurrence. Exactly:
>>>>>>>
>>>>>>> ---------------------------------------------------
>>>>>>> <Location /test>
>>>>>>> ProxyPass ajp://xxx.xxx.xxx.xxx:8009/test ping=1
>>>>>>> </Location>
>>>>>>> ---------------------------------------------------
>>>>>>>
>>>>>>> I examine prior occurrences, but nobody told about the cause
of
>>> this phenomenon.
>>>>>>> Does anybody tell me why the errors came up?
>>>>>
>>>>> Could it be a timeout while waiting for the reply? Add "%D" to your
>>> LogFormat and check, how long those requests take.
>>>>>
>>>>> I didn't understand the "the errors disappeared instead of
>>> cping/cpong retry occurrence" part of your question.
>>>>>
>>>>> Regards,
>>>>>
>>>>> Rainer
>>>>>
>>>>>
>>> ---------------------------------------------------------------------
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>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>>
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>>
>
>
>
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>
>



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