Name resolution failing during docker build

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Name resolution failing during docker build



I am experiencing an issue where I receive the following error when issuing the docker build command:-


curl: (6) Could not resolve host: dl.yarnpkg.com
gpg: no valid OpenPGP data found.



Here is my Dockerbuild file


# Base image
FROM ruby:2.5.0

RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
RUN curl -fsSL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee
/etc/apt/sources.list.d/yarn.lisT
RUN apt-get update
RUN apt-get install -qq -y build-essential libpq-dev nodejs yarn



The commands complete successfully when run outside of docker.



In order to resolve the issues I have tried the following



I have tried DNS servers from Google and OpenDNS, as well as multiple ISPs depending on the location im running the command from



Laptop is running Ubuntu 16:04 with Docker version 18.06.0-ce, build 0ffa825 installed.



Using the following also fails


FROM ruby:2.5.0
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs



causing the following error


W: Failed to fetch http://deb.debian.org/debian/dists/stretch/InRelease Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/stretch-updates/InRelease Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://security.debian.org/dists/stretch/updates/InRelease Temporary failure resolving 'security.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.



So I know this isnt just a problem iwth the dl.yarnpkg.com host.



Running the docker build command with the no-cache option makes no difference.





What happens if you run nslookup dl.yarnpkg.com 8.8.8.8 on your docker host outside of a container?
– BMitch
Aug 10 at 12:41


nslookup dl.yarnpkg.com 8.8.8.8





Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: dl.yarnpkg.com Address: 104.16.60.173 Name: dl.yarnpkg.com Address: 104.16.63.173 Name: dl.yarnpkg.com Address: 104.16.61.173 Name: dl.yarnpkg.com Address: 104.16.62.173 Name: dl.yarnpkg.com Address: 104.16.59.173 As i said i have tried different DNS providers, and the problem occurs with them all.
– user2099762
Aug 10 at 13:29






I have also tried disabling dnsmasq in the ubuntu dns settings....no luck,...
– user2099762
Aug 10 at 13:33





Did you reload the docker engine after changing the daemon.json? What happens if you run docker run -it --rm alpine cat /etc/resolv.conf and docker run -it --rm alpine nslookup dl.yarnpkg.com?
– BMitch
Aug 10 at 13:54


docker run -it --rm alpine cat /etc/resolv.conf


docker run -it --rm alpine nslookup dl.yarnpkg.com





# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 8.8.8.8 nameserver 8.8.4.4 nameserver 192.168.0.1 nameserver 208.67.222.222 search Home nameserver 8.8.8.8 nameserver 8.8.4.4
– user2099762
Aug 10 at 14:03




1 Answer
1



I am using Docker with Ubuntu 16.04 and sometimes I have name resolution problems too.



The only thing that made it through was adding --network=host when building. I'm not really sure what's going on but it seems it needs this to use your computer name resolution capabilities. I hope it helps.


--network=host






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