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.confin both environments look fine (= they are just a list of nameservers)
- then validate each DNS entry:
dig google.com @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.