Specifying DNS for docker build

Question

When using the docker run command, it's possible to specify what the DNS hosts of the container should be by passing --dns <dns_server_ip> arguments.

Is there an equivalent for the docker build command? There is nothing about it in the docs, and trying it throws an error.

Answer 1

A friend of mine suggested another solution:

use ADD to insert a /etc/resolv.conf into the container as the first build instruction. Then the container will use those settings for all future builds.

This has the benefit of being a per-container issue, so I don't need to make the change globally or start up a new VM.