SSL Certificate error whilst using rvm

Given that I have a lovely clean install of Ubuntu 11.10, I decided to use rvm to manage by Ruby installation. The only problem with that is the SSL certificate uses isn’t known to Ubuntu.
I’ve seen a post advocating using -k to ignore CA certificate validation, but that’s not the right thing to do. It works, but only by defeating a security mechanism.
Cut to the chase – how to get around it:

  • Read the error message curl produces, which suggests visiting
  • From there, download cacert.pem and copy this to your home directory
  • Create ~/.curlrc, with the single line cacert = ~/cacert.pem
  • Test using curl > /dev/null – the CA error should not appear

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