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What is idempotence?


Configuration management programs such as CFEngine, Chef, Puppet, Ansible, and Salt talk about idempotency. What exactly does that mean? Lets look at the Merriam-Webster definition:

idempotent (adjective | idem·po·tent | \ˈī-dəm-ˌpō-tənt) relating to or being a mathematical quantity w...

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