[HowTo] Install Memcached On Centos 5

Memcached is a free & open source, high-performance, distributed memory object caching system, intended for use in speeding up dynamic web applications by alleviating database load. A WordPress blog with the W3 Total Cache plugin supports Memcached to cache database queries and page cache. This will make a high-traffic blog use less memory and CPU. Besides using it with WordPress you can use it in your web application as well; read the Memcached API for more details.

How to install Memcached on CentOS 5

Install requirements

1. Open your SSH with root credentials.

2. Install libevent libevent-devel

yum install libevent libevent-devel

Download and install Memcached

1. Download Memcache from http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz or the latest version if available.

wget http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
tar -xzf  memcached-1.4.5.tar.gz
cd memcached-1.4.5/

2. Configure and install:

./configure --prefix=/opt/memcached
make
make install

Create init script

1. Get the script from: http://www.ivankristianto.com/downloads/memcached.txt

wget http://www.ivankristianto.com/downloads/memcached.txt
mv -f memcached.txt /etc/init.d/memcached
chmod 750 /etc/init.d/memcached

2. Start Memcached:

/etc/init.d/memcached start

3. Put it in rc.local so it will start during the boot process:

vim /etc/rc.local
#Add this line:
/etc/init.d/memcached start

Install Memcache PHP extension

1. Get the Memcache module from http://pecl.php.net/package/memcache

wget -c http://pecl.php.net/get/memcache-2.2.5.tgz
tar -xzf  memcache-2.2.5.tgz
cd memcache-2.2.5/

2. Prepare, compile, and install PHP extensions:

>phpize
./configure
make
make install

3. Now add memcache.so to php.ini:

vim /usr/local/lib/php.ini
#add this line
extension="memcache.so"

4. Restart Apache

/etc/init.d/httpd restart

5. See if it is installed properly from the phpinfo() page: