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Puppet

Snippet from Wikipedia: Puppet (software): Puppet is a software configuration management tool which includes its own declarative language to describe system configuration. It is being developed by Puppet Inc., founded by Luke Kanies in 2005. Its primary product, Puppet Enterprise, is a proprietary and closed-source version of its open-source Puppet software. They use Puppet's declarative language to manage stages of the IT infrastructure lifecycle, including the provisioning, patching, configuration, and management of operating system and application components in data centers and cloud infrastructures.
Puppet uses an open-core model; its free-software version was released under version 2 of the GNU General Public License (GPL) until version 2.7.0, and later releases use the Apache License, while Puppet Enterprise uses a proprietary license.
Puppet and Puppet Enterprise operate on multiple Unix-like systems (including Linux, Solaris, BSD, Mac OS X, AIX, HP-UX) and has Microsoft Windows support. Puppet itself is written in Ruby, Facter is written in C++, and Puppet Server and Puppet DB are written in Clojure.

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“I was a sysadmin by trade and had mostly developed in perl, but when I tried to write the prototype I had in mind, I couldn’t get the class relationships I wanted in perl. I tried Python, because this was around 2003 and Python was the next new thing and everyone was saying how great it is, but I just can’t seem to write in Python at all. A friend had said he’d heard Ruby was cool, so I gave it a try, and in four hours I went from never having seen a line of it to having a working prototype. I haven’t looked back since then, and haven’t regretted the choice.” Fair Use Source: https://stackoverflow.com/questions/16727224/why-do-puppet-and-chef-use-ruby

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