How To Switch PHP-FPM Listen On Unix Socket

Switch PHP-FPM Listen On Unix Socket

In this tutorial, we will show you how to switch PHP-FPM listen on Unix Socket. For those of you who didn’t know, PHP-FPM (FastCGI Process Manager) is an implementation of FastCGI for PHP that allows PHP applications to run efficiently on a web server. One way to communicate with PHP-FPM is through a Unix socket, which is a type of inter-process communication (IPC) mechanism that allows processes to communicate with each other on the same machine.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step switch PHP-FPM listen on Unix Socket


  • A server running one of the following operating systems: CentOS Linux.
  • It’s recommended that you use a fresh OS install to prevent any potential issues.
  • SSH access to the server (or just open Terminal if you’re on a desktop).
  • A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Switch PHP-FPM Listen On Unix Socket

Step 1. Installing LEMP server.

This guide assumes you have already installed a LEMP stack, you can follow our guide here.

Step 2. Configure PHP-FPM Listen on Unix Socket.

First, edit the file at /etc/php-fpm.d/www.conf and find this block:

nano /etc/php-fpm.d/www.conf

Add the following file:

; The address on which to accept FastCGI requests.
; Valid syntaxes are:
;   'ip.add.re.ss:port'    - to listen on a TCP socket to a specific address on
;                            a specific port;
;   'port'                 - to listen on a TCP socket to all addresses on a
;                            specific port;
;   '/path/to/unix/socket' - to listen on a unix socket.
; Note: This value is mandatory.
;listen =
listen = /var/run/php5-fpm.sock

Next, let’s create a file at /etc/nginx/conf.d/ named php5-fpm.conf:

upstream php5-fpm-sock {
    server unix:/var/run/php5-fpm.sock;

Step 3. Configure Vhost Nginx.

Now we open Nginx virtual host config file(s), In our Nginx server config we’ll also have to change were to pass PHP requests:

fastcgi_pass php5-fpm-sock;

Save and close, then reload PHP-fpm and Nginx services:

sudo systemctl restart php-fpm
sudo systemctl restart nginx

Using a Unix socket for the connection between the web server and PHP-FPM can improve performance by avoiding the overhead of network communication. It can also be more secure, as the socket can be protected using file system permissions to limit access to the socket only to the web server and PHP-FPM processes.

Congratulations! You have successfully configured PHP-FPM to listen to Unix Socket. Thanks for using this tutorial to set up PHP-FPM Listen to Unix Socket system. For additional help or useful information, we recommend you check the official PHP-FPM website.

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r00t is a seasoned Linux system administrator with a wealth of experience in the field. Known for his contributions to idroot.us, r00t has authored numerous tutorials and guides, helping users navigate the complexities of Linux systems. His expertise spans across various Linux distributions, including Ubuntu, CentOS, and Debian. r00t's work is characterized by his ability to simplify complex concepts, making Linux more accessible to users of all skill levels. His dedication to the Linux community and his commitment to sharing knowledge makes him a respected figure in the field.
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