Binding MySql and Apache to Localhost only

I’ve been reading a few articles on securing MySql and Apache on Ubuntu, and one of the suggestions was ‘Make sure MySQL only allows connections from localhost.’ by binding it to localhost.

Thing is, do I leave it bound to localhost even when the site goes live?

When I goes live what am I supposed to change it to so it still remains safe and not vulnerable to attacks?

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MySQL should stay bound to localhost. However, you would probably want your webserver (Apache) bound to all interfaces.