gistfile1.txt

sudo apt-get update
sudo apt-get install munin-plugins-extra
cd  /etc/munin/plugins
sudo ln -snf /usr/share/munin/plugins/memcached_ memcached_bytes
sudo ln -snf /usr/share/munin/plugins/memcached_ memcached_counters
sudo ln -snf /usr/share/munin/plugins/memcached_ memcached_rates
sudo aptitude install libcache-memcached-perl 
sudo /etc/init.d/munin-node restart
sudo tail -f /var/log/munin/munin-node.log


Edit: If you are running memcached on a non default port or host, you need to 
sudo nano /etc/munin/plugin-conf.d/munin-node

Add the following lines to the end of the config

[memcached_*]
env.host 192.168.123.123
env.port 11211

Save, exit, and restart your node
sudo /etc/init.d/munin-node restart