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Topic: Apache and PHP-FPM fastcgi timeout

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Topic: Apache and PHP-FPM fastcgi timeout

[gijs]

I've noticed that my web server has occasional 1-5 minute outages every few hours..

I've checked the Apache error log and found the following:

[James Blond]

see http://www.fastcgi.com/mod_fastcgi/docs/mod_fastcgi.html ( section -idle-timeout)

[gijs]

Does this mean that a visitor has been waiting 30 sec or longer for his request? If so doesn't this mean there is a problem with my PHP application?

I didn't have this problem on a similar virtual machine (hosting the same site but on Ubuntu 14.10)

[James Blond]

Yes, from the start of the request where wasn't any output (or writing to the disc) within 30 seconds.

[gijs]

How can I troubleshoot that? I would like to know why that is happening.

[James Blond]

Slow internet connection? Slow dos attack? Something else? hard to tell without a log analyse.

[gijs]

[James Blond]

I wonder what max_execution_time is set to in php.ini
Maybe a script takes longer than 30 seconds? Is that an option?


I use PHP 7 on debian over mod_fcgid. See https://github.com/JBlond/debian_build_apache24/blob/master/php7_example.conf

[James Blond]

Do you use mod_fcgid? Mod_fastcgi or mod_proxy_fcgi?

[gijs]

I'm hosting the same website on Windows and there the pages with issues render in 1-2 seconds tops.
Those pages shouldn't take 30 seconds or longer to load, so something must be wrong.

I should mention that I'm using mod_fcgid on windows with a config that was suggested here.
And that I'm not using mod_fcgid on Linux, instead I'm using mod_fastcgi on Linux.

Why I'm using fastcgi on Linux when I used fcgid on Windows?

Here it says that fastcgi is faster than fcgid: https://superuser.com/questions/228173/whats-the-difference-between-mod-fastcgi-and-mod-fcgid
Some old article's also say I can't use PHP-FPM with mod_fcgid. But I'm not sure if that situation has changed since late 2011.

So that's why I'd like to get mod_fastcgi working correctly.
My current mod_fastcgi config looks like this:

[gijs]

Nobody who can help me with this?

According to this article I still can't use mod_fcgid with PHP-FPM: https://www.howtoforge.com/tutorial/perfect-server-ubuntu-16.04-with-apache-php-myqsl-pureftpd-bind-postfix-doveot-and-ispconfig/2/

So I need to use mod_fastcgi but it doesn't work well.

[James Blond]

You can use mod_proxy_fcgid for PHP FPM.

On my server I tried mod_fcgid vs mod_proxy_fcgid with FPM. There wasn't a speed difference.

Now over years using mod_fcgid on windows and linux I don't see the reason to use mod_fastcgi. Speed? I don't think so.

When was the last code change in mod_fastcgi. 2011 / 2012 ??

I say give my setup a try https://github.com/JBlond/debian_build_apache24/
Run the self compile apache on a port of your choise and compare.

[gijs]

So we can use mod_fcgid with PHP-FPM? I'm really confused because a lot of sources say it can't.

I'm trying the proxy approach but I've heard it's less secure and it has some issues for me, which I assume can be resolved with configuration options.

[James Blond]

[gijs]

Thank you for the fast reply James
My goal is to have the best performance, which requires UNIX sockets and PHP-FPM if I understood correctly. But security is a top priority together with stability and then comes performance/efficiency and maintainability.

I'll explain the issues/concerns I have right now.
I couldn't get UNIX sockets to work with php files from subdirectories. (seems like the $1 part is ignored with sockets?) As explained here: https://wiki.apache.org/httpd/PHP-FPM

So I had to resort to using TCP. After some reading I found that it's unsafe to use the fcgi proxy approach. Because the proxy is publicly accessible.
I edited my configuration to:

[James Blond]

if you start it with -b 127.0.0.1:9000 it is safe.

[gijs]

Ubuntu starts it automatically for me, but in the /etc/php/7.0/fpm/pool.d/www.conf file I've set:
listen = 127.0.0.1:9000

Which should do the same and thus is just as safe, I assume.

I still have the following questions/issues:
1. The major issue I still have is that SEF URL's don't load. For example my Joomla front end and admin page load fine. But other URL's don't.
Because they don't have the index.php included in the URL I think. But obviously I don't want the index.php in a Search Engine Friendly URL.

2. from: https://wiki.apache.org/httpd/PHP-FPM

[James Blond]

Well I found [1]

[gijs]

I put this into the main apache config, exactly as you said.

[gijs]

Well, after hours of troubleshooting I found that my apache2.conf file had changed. Restoring the old one resolved my problem with the SEF url's..

(Probably caused by .htaccess file being ignored)

I'm currently using the:
ProxyPassMatch ^/(.*\.php(/.*)?)$ fcgi://127.0.0.1:9000/var/www/xgclan.com/public_html/$1

I'm still having the same problem with some pages being very slow (just like I had with fastcgi, so the problem I had was actually a PHP problem and not a fastcgi problem )