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Maintaining an OpenStack cloud requires that you manage multiple physical servers, and this number might grow over time. Because managing nodes manually is error prone, we strongly recommend that you use a configuration-management tool. These tools automate the process of ensuring that all your nodes are configured properly and encourage you to maintain your configuration information (such as packages and configuration options) in a version-controlled repository.
Several configuration-management tools are available, and this guide does not recommend a specific one. The most popular ones in the OpenStack community are:
Puppet, with available OpenStack Puppet modules
Ansible, with OpenStack Ansible
Chef, with available OpenStack Chef recipes
Other newer configuration tools include Juju and Salt; and more mature configuration management tools include CFEngine and Bcfg2.