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CMCDragonkai/nixos_recovery.md

Created December 13, 2018 01:25
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NixOS Recovery #nix
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nixos_recovery.md

NixOS Recovery

Usually if you screw up the configuration.nix you can rollback to a previous generation during boot.

Then you use https://nixos.org/nixos/manual/#sec-rollback to fix the rollback generation.

However if you really screw it up, and none of the generations work, you may need use a recovery method.

Get a NixOS ISO (it's best to get one that has a same or similar version as your current one).

Boot into the NixOS ISO. Then once you're booted. You need to setup the root filesystem. In most cases, you only need:

/mnt
/mnt/boot
/mnt/tmp

Then you can use nixos-install which will do a nixos-rebuild but targetting /mnt.

You may not need /mnt/boot if you are not also rebuilding any of the boot directory.

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