README: add remark about swap
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README.md
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README.md
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@ -13,11 +13,11 @@ It consists of the [kernel image](https://github.com/nix-community/nixos-images/
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Kexec is a mechanism in Linux to load a new kernel from a running Linux to
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replace the current kernel. This is useful for booting the Nixos installer from
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existing Linux distributions, such as server provider that do not offer a NixOS
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option. After running kexec, the NixOS installer exists only in memory. At the time of
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writing, this requires at least 2.5GB of RAM in the system. If not enough RAM
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is available, the initrd cannot be loaded. Because the NixOS runs only in RAM,
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users can reformat all the system's discs to prepare for a new NixOS
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installation.
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option. After running kexec, the NixOS installer exists only in memory. At the
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time of writing, this requires at least 2.5GB of physical RAM (swap does not
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count) in the system. If not enough RAM is available, the initrd cannot be
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loaded. Because the NixOS runs only in RAM, users can reformat all the system's
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discs to prepare for a new NixOS installation.
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Currently, there are two variants of kexec: [nixos-kexec-installer](https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/nixos-kexec-installer-x86_64-linux.tar.xz)
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and [kexec bundle](https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/kexec-bundle-x86_64-linux).
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