Chef server on RHEL7

Is there an Chef server (open or enterprise) evaluation available for RHEL7? I am a newbie and would love to test install Chef server and client on RHEL7.

https://wiki.opscode.com/display/ChefCN/Bootstrap+Chef+RubyGems+Installation - I followed this old doc with new Ruby versions. gem install chef keeps breaking with ruby-rdoc issues.

Warm regards,
Praveen.N