How to install and configure Memcached on CentOS7 system

This article introduces you to the method of installing and configuring Memcached on CentOS7 system. It has a good reference value and I hope it can help friends in need.

Introduction

Memcached is a distributed, high-performance memorycaching system that improves and accelerates data and objects in memory by caching them. Dynamic web application performance. It is mainly used to speed up sites that make heavy use of databases.

Memcached is also used to cache tables and queries throughout the database to improve database performance. Memcached is free and is used by many websites, such as Facebook, YouTube and Twitter.

This tutorial shows you how to install and configure Memcached on CentOS 7.

Install Memcached

First ensure that all packages are up to date:

sudo yum -y update

Execute the following command to install Memcached:

sudo yum -y install memcached

Enable the Memcached service And add it to the automatic startup when the system starts:

sudo systemctl enable memcached
sudo systemctl start memcached

Configuring Memcached

The default Memcached configuration file is located in the /etc/sysconfig directory.

To configure Memcached, please edit the /etc/sysconfig/memcached file:

sudo vi /etc/sysconfig/memcache

Set or update the following parameters to customize according to your needs:

PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
OPTIONS=""

The following is a brief description of the parameters:

**PORT**：Memcached 使用的默认端口。
**USER**：Memcached 的运行用户。
**MAXCONN**：允许连接到 Memcached 的最大数目。可以根据你的需求增加任何数量。
**CACHESIZE**：内存的缓存大小。
**OPTIONS**：设置服务器的 IP 地址，使 Apache 或 Nginx web 服务器可以连接到服务器。

Save and exit the configuration file, and then restart Memcached:

sudo systemctl restart memcached

Run the following command to confirm that Memcached is running:

sudo netstat -tulpn | grep :11211

You You will see the following output:

tcp        0      0 0.0.0.0:11211           0.0.0.0:*               LISTEN      7757/memcached
tcp6       0      0 :::11211                :::*                    LISTEN      7757/memcached
udp        0      0 0.0.0.0:11211           0.0.0.0:*                           7757/memcached
udp6       0      0 :::11211                :::*                                7757/memcached

Use memcache -tool to check the server statistics.

sudo memcached-tool 127.0.0.1 stats

Install Memcached PHP extension

You can install the PHP extension to use the Memcached daemon through the following command:

sudo yum install php-pecl-memcache

Add configuration in php.ini:

extension="/usr/lib64/php/modules/memcache.so"

Now, restart the Apache or Nginx service:

sudo systemctl restart memcached
# apache
sudo systemctl restart httpd
# nginx
sudo nginx -s reload

To test the Memcached PHP extension, create info.php in the web root directory of apache.

sudo vi /var/www/html/info.php

Add some content

<?php     phpinfo();
?>

Save the file and visit http://your_server_ip/info.

When the phpinfo page renders in the browser, take a look at the following sections:

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