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+---
+title: CentOS with Apache and PHP-FPM (revisited)
+published: 2018-05-30
+modified: 2018-06-01
+---
+
+Almost two years I wrote a [post](apache_php_fpm.html) about using Apache 
+with PHP-FPM on CentOS. Some things have changed (for the better) and also I 
+somehow understand things better now! This post is about configuring Apache 
+with PHP-FPM on CentOS 7. The whole point of this is to increase the 
+performance of running PHP scripts. Even with PHP 5.4, the default on CentOS,
+you'll see a substantial performance improvement compared to `mod_php`.
+
+We will:
+
+* Switch Apache to use MPM Event;
+* Switch PHP-FPM to use the Unix socket;
+* Make existing Apache "mod_php" configuration snippets work with PHP-FPM
+  without modification.
+
+### Installation
+
+    $ sudo yum -y install httpd php-fpm
+
+Make sure you don't have `mod_php` installed, i.e.:
+
+    $ sudo yum -y remove php
+
+### Configuration
+
+#### Apache
+
+We steal the configuration 
+[file](https://src.fedoraproject.org/rpms/php/raw/master/f/php.conf) from 
+Fedora where since a few releases the PHP installation defaults to PHP-FPM. We 
+install that in `/etc/httpd/conf.d/php.conf`. The big advantage here is that 
+you don't need to modify any other Apache configuration files to make use of 
+PHP-FPM!
+
+Furthermore, we switch to 
+[MPM Event](https://httpd.apache.org/docs/trunk/mod/event.html) for performance 
+reasons. Modify `/etc/httpd/conf.modules.d/00-mpm.conf` and disable the 
+`mpm_prefork_module` and enable the `mpm_event_module`:
+
+    #LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
+    LoadModule mpm_event_module modules/mod_mpm_event.so
+
+Don't forget to restart Apache:
+
+    $ sudo systemctl restart httpd
+
+#### PHP
+ 
+By default on CentOS PHP-FPM will listen on a TCP port, we want to modify this
+to use a Unix socket for performance reasons. Make sure you specified/modfied 
+at least these options in `/etc/php-fpm.d/www.conf`:
+
+    listen = /run/php-fpm/www.sock
+    listen.group = apache
+    listen.mode = 0660
+
+The socket permissions will look like this, enough for Apache to talk
+to the socket:
+
+    $ ls -l /run/php-fpm/www.sock
+    srw-rw----. 1 root apache 0 May 23 09:16 /run/php-fpm/www.sock
+
+Don't forget to restart PHP-FPM:
+
+    $ sudo systemctl restart php-fpm
+
+This should be all to run your PHP scripts a lot faster with minimal 
+configuration changes and be in line with the (default) configuration of PHP on
+Fedora and on CentOS 8 when it is finally released!
+
+**Update (2018-06-01)**: do not forget to install the 
+[OPcache](https://secure.php.net/manual/en/intro.opcache.php) extension to 
+further improve performance:
+
+    $ sudo yum -y install php-opcache
+    $ sudo systemctl restart php-fpm