Re: mod_proxy_ajp failed to connect infrequently

[Yu Kikuchi <kikuchi.yu@xxxxxxxxxxxxxx>]

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 GaliÄ wrote:
> ----- "Yu Kikuchi"<kikuchi.yu@xxxxxxxxxxxxxx>  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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