Linux Tactic

Boosting Web Application Performance with Memcached on CentOS 8

Memcached is a high-performance, open-source, distributed memory object caching system designed to improve the speed of dynamic web applications. In this article, we will cover the steps involved in installing and configuring Memcached on CentOS 8.

Installing Memcached and libmemcached Packages

To begin our setup process, we need to install the Memcached and libmemcached packages. We can do this using the following command.

sudo dnf install memcached libmemcached

Once the installation is complete, we need to enable the service.

Enabling Memcached Service

We can enable the Memcached service using the following command.

sudo systemctl enable memcached

Now, we can start the service by entering the following command.

sudo systemctl start memcached

Once the service has started, we need to configure Memcached.

Configuring Memcached

The Memcached configuration file is located at /etc/sysconfig/memcached. We can edit this file to tune the Memcached settings according to our needs.

Editing Memcached Options in Configuration File

We can use the nano text editor to modify the Memcached configuration file. sudo nano /etc/sysconfig/memcached

Here are some of the Memcached options that we can edit:

– PORT: This defines the port on which the Memcached service will listen.

By default, it listens on 11211. – USER: This sets the user under which the Memcached service will run.

By default, it runs as memcached. – MAXCONN: This sets the maximum number of connections that Memcached can handle at once.

The default is set to 1024. – CACHESIZE: This option sets the amount of memory that is allocated to Memcached.

The default is set to 64MB. – OPTIONS: This option allows us to specify additional configuration options in a space-separated list.

Remote Access Configuration and Firewall Setup

We should ensure that the Memcached service is only accessible from our trusted network. We can do this by editing the Memcached configuration file and specifying the IP address of our network under the OPTIONS section.

OPTIONS=”-l

We should also configure the firewall to allow traffic through the port specified in the Memcached configuration file. We can do this using the following command.

sudo firewall-cmd –add-port=11211/tcp –permanent

After modifying the Memcached configuration file and setting up the firewall, we need to restart the Memcached service to apply the changes.

sudo systemctl restart memcached

Summary

In summary, Memcached is a powerful caching system that can boost the performance of dynamic web applications. By following the steps outlined in this article, we can install, enable, and configure Memcached on CentOS 8.

We can also modify the Memcached options in the configuration file according to our requirements and ensure that the service is secure and accessible only from our trusted network using the firewall.

Connecting to Memcached

Connecting to Memcached requires a client library that supports the Memcached protocol. There are several language-specific clients available that can be used to connect and communicate with Memcached.

We’ll review some of the most popular clients and how to install them.

Language-Specific Clients for Connection

The Memcached protocol is a simple text-based protocol that operates over TCP or UDP. The clients that support this protocol are responsible for converting application-specific data to the Memcached protocol format before sending it to the Memcached server.

Similarly, the client applications must parse the responses received from the Memcached server and interpret them in the application-specific format. Let’s take a look at some of the most popular language-specific clients that support the Memcached protocol.

1. PHP

PHP is a popular web development language that offers a dedicated extension for communicating with Memcached.

The Memcached extension provides a high-performance interface for caching application data. To install the extension, we can use the following command:

sudo dnf install php-pecl-memcached

Once the installation is complete, we can enable the extension by adding the following line to the php.ini file:

extension=memcached.so

2. Python

Python has several client libraries that support the Memcached protocol, such as python-memcached and python3-memcached.

We can install the python-memcached library using the following command:

sudo dnf install python3-memcached

After installing the library, we can use the following code to establish a connection with Memcached:

import memcache

client = memcache.Client([‘:11211′])

3. Ruby

Ruby has a popular client library called memcached.

To install the library, we can use the following command:

sudo dnf install rubygem-memcached

After installing the library, we can use the following code to establish a connection with Memcached:

require ‘memcached’

client = Memcached.new(‘:11211′)

These are just a few examples of the many language-specific clients available for connecting to Memcached. Depending on the programming language used in your application, you should choose a client library that best suits your needs.

PHP Extension Installation for Caching Application

Building scalable PHP applications that require high-performance caching can be achieved using the PHP memcached extension. Memcached is known for its efficient scalability, and when it is used with PHP, it is the ultimate solution for web applications.

The PHP memcached extension facilitates communication between the PHP application and the Memcached service. The installation of the PHP memcached extension on your Linux-based server varies, depending on your operating system and PHP version.

However, the process is relatively simple, and the following steps should suffice for installing the PHP memcached extension on CentOS 8. 1.

Add the EPEL repository to your system:

sudo dnf install epel-release

2. Install the memcached extension using the following command:

sudo dnf install php-pecl-memcached

3. Configure the extension for PHP by adding the following line to the php.ini file:

extension=memcached.so

4.

Save the changes and close the php.ini file. 5.

Restart Apache by running the following command:

sudo systemctl restart httpd

With these simple steps, you can have the PHP memcached extension enabled and ready to be utilized by your web application for speedy caching.

Conclusion

Connecting to Memcached is relatively easy once the installation and configuration process is done correctly. This article has explored some popular language-specific clients available to connect to the Memcached service.

It also provided a step-by-step guide on how to install the PHP memcached extension for PHP web applications and caching with Memcached. It is essential to note that this article provides a basic understanding of the connection process to Memcached.

A user can always refer to the Memcached Wiki for detailed and extensive information on Memcached. Nonetheless, with the knowledge provided in this article, you should be able to set up the connection to Memcached seamlessly.

This article covered the importance of Memcached in empowering dynamic web applications for optimal performance. It thoroughly explained the installation and configuration process of Memcached on CentOS 8, followed by a guide on connecting to Memcached using language-specific clients and installing PHP memcached extension for PHP caching application.

It is important to note that the memcached Wiki can provide a much more extensive explanation of Memcached, and that using an optimized caching system can significantly enhance application performance. By following this guide, readers should have a better understanding of how to implement Memcached for their own projects seamlessly.

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