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Merge pull request 'Update docs/nixos-anywhere.md' () from hensoko-docs-nixos-anywhere into main

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docs/nixos-anywhere.md
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# Deploying with nixos-anywhere
## On Target: Enter NixOS from non-NixOS host
In case you cannot boot easily into a nixos-installer image you can download the kexec installer image of NixOS and kexec into it:
```
curl -L https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/nixos-kexec-installer-noninteractive-x86_64-linux.tar.gz | tar -xzf- -C /root
/root/kexec/run
```
```
mkdir -p /etc/secrets/initrd
ssh-keygen -t ed25519 -f /etc/secrets/initrd/ssh_host_ed25519_key
```
## Run Disko
```
nix run github:nix-community/nixos-anywhere -- --flake .#blue-shell root@194.13.83.205
nix run github:nix-community/nixos-anywhere -- --flake .#<hostname> --target-host root@<host> --phases disko
```
## On Target: Create inital ssh host key used in initrd
```
mkdir -p /mnt/etc/secrets/initrd
ssh-keygen -t ed25519 -f /mnt/etc/secrets/initrd/ssh_host_ed25519_key
```
## Run NixOS Anywhere
```
nix run github:nix-community/nixos-anywhere -- --flake .#<hostname> --target-host root@<host> --phases install,reboot
```