os/doc/start/from-nixos.md

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# From NixOS
## Generate Configuration
Assuming you're happy with your existing partition layout, you can generate a
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basic NixOS configuration for your system using:
```sh
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bud up
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```
This will make a new file `hosts/up-$(hostname).nix`, which you can edit to
your liking.
You must then add a host to `nixos.hosts` in flake.nix:
```nix
{
nixos.hosts = {
modules = hosts/NixOS.nix;
};
}
```
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Make sure your `i18n.defaultLocale` and `time.timeZone` are set properly for
your region. Keep in mind that `networking.hostName` will be automatically
set to the name of your host;
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Now might be a good time to read the docs on [suites](../concepts/suites.md) and
[profiles](../concepts/profiles.md) and add or create any that you need.
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> ##### _Note:_
> While the `up` sub-command is provided as a convenience to quickly set up and
> install a "fresh" NixOS system on current hardware, committing these files is
> discouraged.
>
> They are placed in the git staging area automatically because they would be
> invisible to the flake otherwise, but it is best to move what you need from
> them directly into a host module of your own making, and commit that instead.
# Installation
Once you're ready to deploy `hosts/my-host.nix`:
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```sh
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bud my-host switch
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```
This calls `nixos-rebuild` with sudo to build and install your configuration.
> ##### _Notes:_
> - Instead of `switch`, you can pass `build`, `test`, `boot`, etc just as with
> `nixos-rebuild`.
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