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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
+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