Here is a lengthy post from Tim Cuthbertson on the virtues of building servers with NixOS. “It should hopefully be obvious at this point why NixOS is better than puppet: Both are declarative, but puppet is impure and non-exhaustive – when you apply a config, puppet compares everything specified against the current state of the system. Everything not specified is left alone, which means you’re only specifying a very tiny subset of your system. With NixOS, if something is not specified, it is not present.“
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