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From Björn Zettergren <bjorn.zetterg...@basefarm.se>
Subject Re: [users@httpd] FastCGI causes website to hang
Date Tue, 01 Mar 2011 15:34:11 GMT
Hi,

Your configuration does not really match mine, but i've had a similar 
issue with sort of the same behaviour.

I was using mod_fastcgi (not mod_fcgid), and PHP used the APC (opcode 
cache for php). The source of my problem was that a PHP-CGI-child would 
also remove the semaphore that its parent created when the childs 
maxrequests-setting was reached.

Try restarting your apache, then list your semaphores with the command 
"ipcs". Wait until apache stops working in the described manner, then 
list them again and check if there are any semaphores missing.

But then again, this might not be relevant at all.

/Björn



On 03/01/2011 04:10 PM, roberto blanko wrote:
> Hello fellow Apache community,
>
> we just switched from our old hosting platform (which used to run PHP as
> an Apache module) to Plesk which (in our configuration) runs PHP through
> FastCGI. In general we prefer the principle and security features of
> FastCGI, so we want to stick to it.
>
> However, since we started migrating some bigger websites (bigger means
> more hits a day) we encounter regular stability problems. After some
> time (can be some minutes to some hours) some websites just don't react
> anymore. They keep loading and loading until Apache quits with a timeout.
>
> The only way to solve this issue, is to restart apache. When the server
> hangs `ps aux | grep php` shows the following output:
>
> user2 9708 0.0 1.1 263772 37544 ? S Feb21 0:04 /usr/bin/php-cgi -c
> /var/www/vhosts/user2.domain.tld/conf/php.ini
> user2 9836 0.0 1.2 264028 37812 ? S Feb21 0:03 /usr/bin/php-cgi -c
> /var/www/vhosts/user2.domain.tld/conf/php.ini
> user1 15775 0.1 1.4 266704 45476 ? S 07:36 0:24 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 15780 0.0 1.4 266704 45408 ? S 07:36 0:14 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 15790 0.1 1.4 266588 45244 ? S 07:36 0:25 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user3 23580 0.0 1.0 261880 34020 ? S 08:17 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user3.domain.tld/conf/php.ini
> user1 23806 0.2 1.1 264128 37644 ? S 11:40 0:01 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user3 24230 0.0 0.8 259016 26112 ? S 04:53 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user3.domain.tld/conf/php.ini
> user1 27796 0.4 1.0 259772 33556 ? S 11:50 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 27831 0.2 1.1 264124 37616 ? S 11:51 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 27857 0.2 1.0 259772 33292 ? S 11:52 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 27963 0.2 1.1 262480 36284 ? S 11:52 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 28001 0.2 0.9 261580 28856 ? S 11:52 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 28012 0.1 0.9 261596 28860 ? S 11:52 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 28037 0.3 0.8 260548 27712 ? S 11:53 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 28042 1.3 1.1 263600 36044 ? S 11:53 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
> user1 28058 0.7 1.1 263852 36124 ? S 11:53 0:00 /usr/bin/php-cgi -c
> /var/www/vhosts/user1.domain.tld/conf/php.ini
>
> If I keep waiting for some time the PHP processes change slightly and
> are being replaced over time by processes having 0:00 all the time.
>
> We already tried to increase some numbers in the FastCGI-settings, but
> it didn't help. No matter how high we set FcgidMaxProcesses and
> FcgidMaxProcessesPerClass: At the time the server crashes, we only have
> about 10 to 20 running processes - never more.
>
> This is how our current config looks like:
>
> <IfModule mod_fcgid.c>
> FcgidIPCDir /var/run/mod_fcgid/sock
> FcgidProcessTableFile /var/run/mod_fcgid/fcgid_shm
>
> FcgidIdleTimeout 40
> FcgidProcessLifeTime 30
> FcgidMaxProcesses 1000
> FcgidMaxProcessesPerClass 100
> FcgidMinProcessesPerClass 25
> FcgidConnectTimeout 30
> FcgidIOTimeout 130
> # PHP's max_execution time is 120, so give FCGI 10 secs extra
> FcgidInitialEnv RAILS_ENV production
> FcgidIdleScanInterval 10
> </IfModule>
>
> The error_log doesn't show anything suspicious besides some lines from
> time to time:
> mod_fcgid: process 23786 graceful kill fail, sending SIGKILL
>
> Do you have any ideas what the problem could be? Any help would be very
> appreciated. If you need more specific information, just ask for it and
> I'll take a look at the server. But since I have not even the slightest
> idea, what the cause could be, I'm not sure what to post here.
>
> Regards
> roberto

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