> If you aren't using Rails for your web-stack, I suspect you might not be using any Ruby at all on a server. It isn't even part of the CentOS minimal install. Python is. I'm not sure about how Ruby is used in Ubuntu, maybe it's more common there.

There is no Ruby installed by default in Ubuntu - or Debian last time I looked. Also (like Redhat) a significant chunk of the userspace distro code is written in Python.

Currently Vagrant is the only Ruby tool I use in sysadmin/devops land, and it's a workstation only installation rather than a server one.

Not having to deploy a whole new language runtime for your devops tooling is why I preferred Ansible and Salt over Chef and Puppet.