This is an example rc.local file used to start Memcached

rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

memcached -u www-data -d -m 16 -l 127.0.0.1 -p 11211 #default
# memcached -u www-data -d -m 16 -l 127.0.0.1 -p 11212 #uncomment for extra daemons.
# memcached -u www-data -d -m 16 -l 127.0.0.1 -p 11213 #uncomment for extra daemons.
# memcached -u www-data -d -m 16 -l 127.0.0.1 -p 11214 #uncomment for extra daemons.

exit 0