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Dockerfile の RUN gem install で Gem::RemoteFetcher::UnknownHostError に遭遇する事がある件

Posted at 2017-04-21

use DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
https://meta.discourse.org/t/getting-unknownhosterror-from-gem-remotefetcher-on-new-install/43464/4

上記を参考に、Docker for Mac の設定を以下の様にして様子見中。

以下の Dockerfile を作り、

Dockerfile

FROM ruby:2.4.1-alpine

RUN gem install rubygems-update --no-document

以下の繰り返し実行で Gem::RemoteFetcher::UnknownHostError に遭遇せず。

$ for i in $(seq 1 10)
do
  docker image build --no-cache -t test docker/
  sleep 1
done