Below is a summary of steps taken to get memcache support for php:
1. Install memcached and php-pear for pecl support to download and compile memcache for php.
yum --enablerepo=epel install memcached php-pear
pecl install memcache
2. Configure memcached (/etc/sysconfig/memcached) and start it up:
chkconfig memcached on
service memcached start
3. Create /etc/php.d/memcache.ini file with the below contents:
extension=memcache.so
4. Reload apache and/or php-fpm processes:
service httpd reload
service php-fpm restart
5. Check with "php -i" or "phpinfo()" that memcache support is enabled.
6. Memcached listens to port 11211 by default. Status and stats:
memcached-tool localhost:11211 display
memcached-tool localhost:11211 stats