How does this configuration work?

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Hello,

So, the need to make sense of this is not an issue: I will be using the mod_proxy_fcgi to use php-fpm.  I am just curious.

While trying various configurations to get php-fpm to work, I found the following conundrum: the following configuration should NOT work but it does...

Here is the apache configuration snippet derived from this site dated last August.
<Directory /usr/lib/cgi-bin> 
Require all granted 
 </Directory> 
 <IfModule mod_fastcgi.c> 
AddHandler php7-fcgi .php 
Action php7-fcgi /php7-fcgi virtual 
Alias /php7-fcgi /usr/lib/cgi-bin/php7-fcgi 
                FastCgiExternalServer /usr/lib/cgi-bin/php7-fcgi -socket /var/run/php/php7.0-fpm.sock -pass-header Authorization
</IfModule>

Here is the php-fpm www pool socket definition as configured out-of-the-box:
listen = /run/php/php7.0-fpm.sock

My test php script calls phpinfo() only.  It works.  It’s not clear how it works.  
Apache opens /var/run/php/php7.0-fpm.sock
php-fpm opens /run/php/php7.0-fpm.sock
removal of either file causes php not to work.
When I point apache to the socket file php-fpm opens, it does not work.

HOW?  How does apache manage to connect to php-fpm when the defined socket paths do not make sense?  As far as I know, the unix socket file is simply opened and read/written to: there’s no way to tell linux “connect both files to each other” from within a program...

Thanks for your time!


Jason BrooksSystems Administrator
eROIPerformance is Art.
 
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