docker (alpine?) DNS issue ‘bad address’

Well, this just cost me several hours, and I couldn’t find it anywhere else, so let’s start this blog with a note to self:

  • If you’re doing some docker stuff (like building an alpine image) and your docker build fails with some DNS error
  • but your host has no issue resolving the names
  • and your /etc/resolv.conf in both environments look fine (= they are just a list of nameservers)
  • then validate each DNS entry: dig @ip.of.your.nameserver
  • and remove any non-responding entry!

In my case, my last nameserver entry was incorrect, which my host computer had not issue with, but blew up my docker build process every time.

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