How

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Configuration management software - we have many options today:

• CFEngine - runs on C
• Puppet - Ruby , series of steps
• Chef - DSL (Ruby-based) , declarative
• Ansible - Python , series of steps (like a script), YAML files
• SaltStack - YAML files

These are just a short list, you can read comparison of all the different apps via Puppet vs. Chef vs. Ansible vs. Salt.

Wikipedia has a very nice Comparison of open-source configuration management software page.