What to do when /etc/network/interfaces is missing on Debian?

sunknudsen asked:

I just configured a Debian 10 virtual private server on a new hosting provider and somehow /etc/network/interfaces is missing.

Running ip a reveals a lo and [email protected] interface.

Trying to add an interface alias to [email protected].

What is going on here?

My answer:

Your "virtual machine" is actually a container, not a virtual machine, and it appears your container host is configuring networking for you.

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