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To install memcached, simply run the following command:

sudo apt-get install memcached

Once it’s installed, edit /etc/memcached.conf and change the line beginning ‘-m’ which is the amount of memory (in megabytes) to allocate to the server. You can also change the IP address that the server listens on  in the line beginning -l.
Now restart the daemon by running

/etc/init.d/memcached restart

To start the new memcache manually using the following command:

/usr/local/bin/memcached -d -u root -m 512 -p 11211

Now you have memcache set up and running on your server. A great feature of memcached is that you can easily cluster servers. If you want to do this, simply install memcache on your other servers before continuing.