Installing and configuring Memcache - gd-99/symbiogd GitHub Wiki
sudo apt-get install php5-memcache memcached php-pear netcat build-essential
memcached it is part of program who make socket and cache memory.
sudo pecl install memcache
part of php module who add php function for communicate with memcached program
Once you have completed the installation of memcache with PECL, add memcached to memcache.ini:
echo "extension=memcache.so" | sudo tee /etc/php5/conf.d/memcache.ini
And for php fpm server
echo "extension=memcache.so" | sudo tee /etc/php5/fpm/conf.d/memcache.ini
After Memcache is downloaded, you can check that it has been installed by searching for it:
ps aux | grep memcache
Additionally, you can see the memcache stats by typing:
echo "stats settings" | nc localhost 11211
More info about Memcached : http://memcached.org/