vagrantのプラグインがno such name (https://gems.hashicorp.com/specs.4.8.gz)と表示されてインストールできないとき

tl;dr

vagrant plugin installコマンドのケツにこれをつけましょう。

--plugin-clean-sources --plugin-source https://rubygems.org

発生事象

# vagrant plugin install sahara vagrant-libvirt vagrant-mutate
Installing the 'sahara' plugin. This can take a few minutes...
Vagrant failed to load a configured plugin source. This can be caused
by a variety of issues including: transient connectivity issues, proxy
filtering rejecting access to a configured plugin source, or a configured
plugin source not responding correctly. Please review the error message
below to help resolve the issue:

  no such name (https://gems.hashicorp.com/specs.4.8.gz)

Source: https://gems.hashicorp.com/

解決策

つけたらなおりました。IPv6無効化とかあまり関係なかった。

vagrant plugin install sahara vagrant-libvirt vagrant-mutate --plugin-clean-sources --plugin-source https://rubygems.org

参考

• https://github.com/hashicorp/vagrant/issues/11008
• http://memories.zal.jp/WP/blog/20180224_2968.html