“gem install rails” fails with DNS error

Question

$ rvm use
Using /home/owner/.rvm/gems/ruby-2.1.2
$ gem install rails
ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
    Errno::ECONNREFUSED: Connec         


        

Answer 1

For me "your-dns-needs-immediate-attention", actually meant "your gem sources are not valid".

gem source --list

Check the output. If the current list isn't valid, then you can simply

gem source -a https://rubygems.org

...or whatever other sources are appropriate. Then use the -r flag to remove the invalid sources.