2023-12-10 15:57:18 +00:00
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# NixOS {#sec-nixos-state}
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2023-12-12 11:33:47 +00:00
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## `/nix` {#sec-state-nix}
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2023-12-10 15:57:18 +00:00
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2023-12-12 11:33:47 +00:00
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NixOS needs the entirety of `/nix` to be persistent, as it includes:
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- `/nix/store`, which contains all the system's executables, libraries, and supporting data;
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- `/nix/var/nix`, which contains:
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- the Nix daemon's database;
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- roots whose transitive closure is preserved when garbage-collecting the Nix store;
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- system-wide and per-user profiles.
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## `/boot` {#sec-state-boot}
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`/boot` should also be persistent, as it contains:
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- the kernel and initrd which the bootloader loads,
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- the bootloader's configuration, including the kernel's command-line which
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determines the store path to use as system environment.
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2023-12-10 15:57:18 +00:00
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2023-12-12 11:26:00 +00:00
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## Users and groups {#sec-state-users}
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- `/var/lib/nixos` should persist: it holds state needed to generate stable
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uids and gids for declaratively-managed users and groups, etc.
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- `users.mutableUsers` should be false, *or* the following files under `/etc`
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should all persist:
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- {manpage}`passwd(5)` and {manpage}`group(5)`,
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- {manpage}`shadow(5)` and {manpage}`gshadow(5)`,
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- {manpage}`subuid(5)` and {manpage}`subgid(5)`.
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