Docker build “Could not resolve 'archive.ubuntu.com'” apt-get fails to install anything

Question

I\'ve been trying to run Docker build on various files which previously worked before, which are now no longer working.

As soon as the Docker file included any line

Answer 1

On my system (macOS High Sierra 10.13.6 with Docker 2.1.0.1) this was due to a corporate proxy.

I solved this by two steps:

1. Manually configure proxy settings in Preferences>Proxies

2. Add the same settings to your config.json inside ~/.docker/config.json like:

    "proxies":
   {
     "default":
     {
       "httpProxy": "MYPROXY",
       "httpsProxy": "MYPROXY",
       "noProxy": "MYPROXYWHITELIST"
     }
   }