Docker pull not using correct DNS server when private registry on VPN

Docker Desktop for Mac
2

For anyone else who hits this issue, you can workaround this by accessing the Docker VM directly and modifying the configuration inside the VM:

  1. Access the terminal of the Docker Alpine VM using GNU screen:
    $ screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty

  2. Login as user root. No password necessary

  3. Edit /etc/hosts and/or /etc/resolv.conf such that you can resolve your internal registry server from inside the Docker VM

  4. To quit the screen app, type CTRL-A, then CTRL-\

Note that these changes survive until Docker daemon is restarted. After which the steps will need to be performed again.

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