Memcached is a distributed, high-performance, in-memory caching system that is primarily used to speed up sites that make heavy use of databases. It can however be used to store objects of any kind. Nearly every popular CMS has a plugin or module to take advantage of memcached, and many programming languages have a memcached library, including PHP, Perl, Ruby, and Python. Memcached runs in memory and is thus quite speedy, since it does not need to write data to disk.
These instructions are intended specifically for installing Memcached on a single CentOS 7 node.
I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
Step #1 Install Memcached
First, clean-up yum:
yum clean all
As a matter of best practice we’ll update our packages:
yum -y update
Installing Memcached and related packages is now as simple as running just one command:
yum -y install memcached
Step #2: Configuration of the Memcached Installation
Use the following command to view information on the memcached command:
The default configuration file can be found at:
When started, Memcached will start on port 11211 by default per the default configuration file:
To change the port (PORT), the user Memcached runs as (USER), the maximum number of allowed connections to Memcached (MAXCONN), or the cache size in megabytes (CACHESIZE), simply edit the configuration file.