Installing memcached

host ~ # emerge -pv memcached
[ebuild   R   ] net-misc/memcached-1.4.5  USE="-debug -sasl -slabs-reassign -test" 0 kB

host ~ # emerge memcached

Configuring memcached

Memcached configuration file lives in /etc/conf.d/memcached. Here's a reasonable example, 1GiB on internal network only. 

MEMCACHED_BINARY="/usr/bin/memcached"
MEMUSAGE="1024"
MEMCACHED_RUNAS="memcached"
MAXCONN="2048"
LISTENON="10.101.105.109"
PORT="11211"
UDPPORT="${PORT}"
PIDBASE="/var/run/memcached/memcached"

Configure memcached to start on boot & start it now.

host ~ # rc-update -a memcached
host ~ # /etc/init.d/memcached start

Tuning memcached

This is a larger subject than can be covered here but methods include:

See Also