Docker-compose container using host DNS server

You don’t specify which environment you’re running docker-compose in e.g Mac, Windows or Unix, so it will depend a little bit on what changes are needed. You also don’t specify if you’re using the default bridge network in docker on a user created bridge network.

In either case, by default, Docker should try and map DNS resolution from the Docker Host into your containers. So if your Docker Host can resolve the private DNS addresses, then in theory your containers should be able to as well.

I’d recommend reading this official Docker DNS documentation as it is pretty reasonable. Here for the default Docker bridge network, here for user created bridge networks.

A slight gotcha is if you’re running using Docker for Mac, Docker Machine or Docker for Windows you need to remember that your Docker Host is actually the VM running on your machine and not the physical box itself, so you need to ensure that the VM has the correct DNS resolution options set. You will need to restart your containers for changes to DNS resolution to be picked up by them.

You can of course override all the default settings using docker-compose. It has full options for explicitly setting DNS servers, DNS search options etc. As an example:

version: 2
services:
 application:
  dns:
   - 8.8.8.8
   - 4.4.4.4
   - 192.168.9.45

You’ll find the documentation for those features here.

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