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The following article will describe how in a very simple way to install memcached in Ubuntu 18.04 and secure it to listen locally.
Installation is simple let's get started.

At the beginning of the update repository list command:

sudo apt update

The next step is to install the memcached and necessary packages:

sudo apt install memcached libmemcached-tools

Now we will protect it.

Centos 7
modify file

/etc/sysconfig/memcached

modifying:

OPTIONS=""

na

OPTIONS="-l 127.0.0.1 -The 0"

Debian/Ubuntu
Check to see if the file

/etc/memcached.conf 

It has content:

-l 127.0.0.1

If it does not, add it as follows, and if it is - we add only the tip:

-l 127.0.0.1 -The 0

Save and restart memcached.

What are these letters?

-l 127.0.0.1 He tells us that the memcached server to listen on only locally

-The 0 disables the UDP