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From Erik Wasser <erik.was...@iquer.net>
Subject [users@httpd] No killing/replacing of mod_fcgid processes with the status 'Exiting(communication error)'
Date Mon, 05 Jul 2010 21:25:27 GMT
Hello list,

I'm using httpd-2.2.3-31 on a cent os 5 system in combination with 
'mod_fcgid-2.3.5' and I'm having trouble with it. (More details of the used 
system are below in this mail.)

The problem is that the communication works at first (after a restart) and 
suddenly all 3 mod_fcgid process switches from the state 
'Exiting(communication error)'. Not at once but in a short time range 
(minutes).

I've activated the handler "server-status" ("ExtendedStatus On" was set too) 
so I can have a detailed look on the problem. Here's some output of /server-
status:

>  Process name: foo_fastcgi.fcgi
>
>    Pid  Active Idle Accesses            State
>   31845 64849  5340 542      Exiting(communication error)
>   31808 64861  5507 477      Exiting(communication error)                           
                                                                                         
                      
>   31843 64852  5647 489      Exiting(communication error)

As you can clearly see all process are "brocken" and they will not be 
replaced. I thought that were a feature of mod_fcgid so I'm a little bit 
confused here.

Here are the log lines that will "turn" a mod_fcgid process from "Ready" or 
"Working" to "Exiting(communication error)":

[Sun Jul 04 00:27:35 2010] [warn] [client 10.0.11.230] mod_fcgid: read data 
timeout in 40 seconds
[Sun Jul 04 00:27:35 2010] [error] [client 10.0.11.230] Premature end of 
script headers: well_fastcgi.fcgi
[Sun Jul 04 00:29:55 2010] [warn] [client 10.0.11.230] mod_fcgid: read data 
timeout in 40 seconds
[Sun Jul 04 00:29:55 2010] [error] [client 10.0.11.230] Premature end of 
script headers: well_fastcgi.fcgi
[Sun Jul 04 00:32:42 2010] [warn] [client 10.0.11.230] mod_fcgid: read data 
timeout in 40 seconds
[Sun Jul 04 00:32:42 2010] [error] [client 10.0.11.230] Premature end of 
script headers: well_fastcgi.fcgi

The httpd will span just more processes and finally reaches MaxClients with 
this error message.

[Sun Jul 04 02:01:02 2010] [error] server reached MaxClients setting, consider 
raising the MaxClients setting

Did you spot the time difference? After one and a half hour the httpd runs out 
of httpd processes. Aren't they are supposed to be some "timeouts" for 
recreating the mod_fcgid processes?

I've decided to limit the request per process and switched on the option 
"FcgidMaxRequestsPerProcess 100". But this was only changing the error message 
from "Exiting(communication error)" to "Exiting(lifetime expired)".

Everything else stayed the same. All 3 processes in /server-status are marked 
with 'Exiting(lifetime expired)' but nothing happens. The number of httpd 
grows and the error message 'server reached MaxClients setting, consider 
raising the MaxClients setting' appeared again.

What I'm missing here? Isn't the module mod_fcgid not supposed to work this 
way? Spawn some processes, pipe in the data, kill non working processes and 
replace the killed process with a new (working) one.

Can I turn on some verbosity (for this modul)?
What else can I do/try? Any ideas?
Where can I get more information about this situation?
I've googled for the problem but I found only configurations problems. My app 
(to be clear) is working so it's not some kind of permission problem.

Thanks for your work and your help.

PS: Here are some more information about my system:

app backend
===========

perl with catalyst (http://search.cpan.org/~bobtfish/Catalyst-
Runtime-5.80024/lib/Catalyst/Engine/FastCGI.pm)

os
==

CentOS release 5.4 (Final)

httpd
=====

httpd-2.2.3-31.el5.centos.2

http configuration (important part):
====================================

LoadModule fcgid_module modules/mod_fcgid.2.3.5.so
AddHandler fcgid-script .fcgi .fcg
FcgidIPCDir /srv/www/app/tmp/fcgi_ipc

FCGIWrapper "/srv/www/app/sites/app/script/app_fastcgi.fcgi" .fcgi
ScriptAlias / /srv/www/app/sites/app/script/app_fastcgi.fcgi/
FcgidSpawnScoreUpLimit 100

-- 
So long... Fuzz

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