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manual: smaller fixes for nixos-rebuild build-image docs

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* correct option type for `image.modules`
* fix grammar
* show actual output of the command to
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phaer 2025-04-14 11:34:33 +02:00
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16
nixos/doc/manual/installation/building-images-via-nixos-rebuild-build-image.chapter.md
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@ -2,23 +2,27 @@
Nixpkgs contains a variety of modules to build custom images for different virtualization platforms and cloud providers, such as e.g. `amazon-image.nix` and `proxmox-lxc.nix`.
While those can be imported individually, `system.build.images` provides an attribute set mapping variant names to image derivations. Available variants are defined - end extendable - in `image.modules`, an attribute set mapping variant names to a list of NixOS modules.
While those can be imported directly, `system.build.images` provides an attribute set mapping variant names to image derivations. Available variants are defined - end extendable - in `image.modules`, an attribute set mapping variant names to NixOS modules.
All of those images can be built via both, their `system.build.image` attribute, and the CLI `nixos-rebuild build-image`. To build i.e. an Amazon image from your existing NixOS configuration:
All of those images can be built via both, their `system.build.image` attribute and the `nixos-rebuild build-image` command.
For example, to build an Amazon image from your existing NixOS configuration, run:
```ShellSession
$ nixos-rebuild build-image --image-variant amazon
$ ls result
nixos-image-amazon-25.05pre-git-x86_64-linux.vhd nix-support
[...]
Done. The disk image can be found in /nix/store/[hash]-nixos-image-amazon-25.05pre-git-x86_64-linux/nixos-image-amazon-25.05pre-git-x86_64-linux.vpc
```
To get a list of all variants available, run `nixos-rebuild build-image` without arguments.
::: {.example #ex-nixos-rebuild-build-image-customize}
## Customize specific image variants {#sec-image-nixos-rebuild-build-image-customize}
The `image.modules` option can be used to set specific options per image variant, in a similar fashion as [specialisations](options.html#opt-specialisation) for generic nixos configurations.
The `image.modules` option can be used to set specific options per image variant, in a similar fashion as [specialisations](options.html#opt-specialisation) for generic NixOS configurations.
E.g. images for the cloud provider Linode use `grub2` as a bootloader by default. If you are using `systemd-boot` on other platforms and want to disable it for Linode onlz, you could use the following options:
E.g. images for the cloud provider Linode use `grub2` as a bootloader by default. If you are using `systemd-boot` on other platforms and want to disable it for Linode only, you could use the following options:
``` nix
image.modules.linode = {

3
nixos/doc/manual/redirects.json
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@ -146,6 +146,9 @@
"ex-config": [
"index.html#ex-config"
],
"ex-nixos-rebuild-build-image-customize": [
"index.html#ex-nixos-rebuild-build-image-customize"
],
"sec-installation-additional-notes": [
"index.html#sec-installation-additional-notes"
],