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NixOS is a Linux distribution with a unique approach to package and configuration management. Built on top of the Nix package manager, it is completely declarative, makes upgrading systems reliable, and has many other advantages. NixOS has a completely declarative approach to configuration ... [More] management: you write a specification of the desired configuration of your system in NixOS’s modular language, and NixOS takes care of making it happen. NixOS has atomic upgrades and rollbacks. It’s always safe to try an upgrade or configuration change: if things go wrong, you can always roll back to the previous configuration. Declarative specs and safe upgrades make NixOS a great system for DevOps use. [Less]

The Purely Functional Package Manager Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. It provides atomic upgrades and rollbacks, side-by-side installation of multiple versions of a package, multi-user package management and easy setup of build environments.

NixOps is a tool for deploying sets of NixOS Linux machines in a network or cloud, either to real hardware or to virtual machines. It takes as input a declarative specification of a set of “logical” machines and then performs any necessary steps actions to realise that specification: instantiate ... [More] cloud machines, build and download dependencies, stop and start services, and so on. It extends NixOS’s declarative approach to system configuration management to networks and adds provisioning. NixOps runs on Linux and Mac OS X. [Less]