Centos 7 Nginx Php Worker Process And Worker Connection

Centos 7 Nginx PHP Worker Process And Worker Connection

What is Nginx?

Nginx (pronounced “engine-x”) is an open source web server software designed with high performance, stability and low memory usage in mind. Nginx is an HTTP and reverse proxy server, as well as a mail proxy server. It can be used to serve as a frontend to web services such as PHP-based web applications. Nginx is a very versatile tool and can be used to solve many different tasks.

Nginx is a highly optimized web server and can serve large amounts of concurrent requests per second. Nginx is especially good at serving static content such as images, CSS and JavaScript files, which can drastically reduce the server load. Nginx also has some advanced features such as reverse proxying, caching, load balancing, etc.

What is CentOS 7?

CentOS 7, an enterprise-level Linux distribution based on Red Hat Enterprise Linux, is a direct descendant of Red Hat Linux. CentOS is known for its stability and security, making it an ideal platform for running mission-critical applications. CentOS 7 is the latest major release and provides the latest software packages and the latest security updates. It is important to note that this version of CentOS is not compatible with the older versions of CentOS or Red Hat Linux.

CentOS 7 provides a stable and secure platform for running web applications. The Linux distribution can be freely downloaded and used without any license fee. The packages available with the distribution are as up to date as the upstream vendor, Red Hat Enterprise Linux. CentOS also provides access to the Red Hat Network (RHN) where users can get updates and security patches.

What is PHP?

PHP is an open source scripting language. It is mainly used for server-side web development, but it can also be used for command line scripting and general-purpose programming. PHP is an interpreted language, which means it does not have to be compiled before it can be used. It is also well-known for its ability to interact with databases such as MySQL, and for its wide range of libraries for various tasks.

PHP is a widely used language for developing web applications. It is easy to learn and offers great flexibility. PHP can be used to develop various types of applications, from simple websites to complex enterprise-level software. PHP also supports a number of frameworks and libraries that make development easier.

What are Worker Processes and Worker Connections in Nginx and PHP?

Worker processes and worker connections are two key components in the Nginx and PHP configuration. The worker process is responsible for processing the requests received by Nginx and sending the response to the client. The worker connection is the connection between the Nginx server and the backend application (such as PHP).

Nginx uses a single master process and multiple worker processes to manage requests. Each worker process can handle up to a certain number of concurrent requests. This number is defined by the worker_connections directive in the Nginx configuration file. The more worker connections that are available, the more concurrent requests the server can handle.

The Nginx and PHP configuration also needs to define how many PHP processes are allowed to be spawned. This is done with the php-fpm.conf configuration file. The pm.start_servers directive defines the number of PHP processes that will be started when the server is first started, and the pm.max_children directive defines the maximum number of PHP processes that can be spawned. The total number of PHP processes running at any time is determined by the amount of concurrent requests that the server is handling.

How to Install Nginx, PHP and Configure Worker Processes and Connections on CentOS 7?

Installing and configuring Nginx, PHP and worker processes and connections on CentOS 7 is not difficult, but does require some prior knowledge of system administration and these types of applications. Here is an overview of the necessary steps.

The first step is to install Nginx and PHP. On CentOS 7, this can be done using the yum package manager. The Nginx and PHP packages are available through the default CentOS repositories. Once installed, the Nginx and PHP configuration files can be edited to enable worker processes and connections.

The Nginx worker_processes and worker_connections directives need to be set in the /etc/nginx/nginx.conf configuration file. The default setting of 1 worker process and 1024 worker connections should be sufficient for most basic applications. If more concurrent connections are needed, the worker_connections directive can be increased.

For PHP, the pm.start_servers, pm.min_spare_servers, pm.max_spare_servers and pm.max_children directives need to be set in the /etc/php-fpm.conf configuration file. The exact values for the directives will depend on the expected number of concurrent requests and the memory available on the system.

Once the Nginx and PHP configuration files have been edited, the Nginx and PHP services need to be restarted. This can be done using the systemctl command. Once the services are restarted, the Nginx and PHP workers should be up and running and accepting connections.


Nginx, PHP and their worker processes and connections are important components of any web application. Installing and configuring Nginx and PHP on CentOS 7 is not difficult, but does require some knowledge of system administration and these types of applications. Knowing how to install, configure, and troubleshoot the Nginx and PHP workers and connections can help ensure that web applications run smoothly and securely.

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