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move disko-images to its own chapter
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Jörg Thalheim
Jörg Thalheim
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@ -9,6 +9,7 @@
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- [System Requirements](./requirements.md)
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- [How to Guide](./HowTo.md)
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- [Disko-Install](./disko-install.md)
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- [Disko-Images](./disko-images.md)
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- [Support Matrix](./supportmatrix.md)
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- [Reference](./reference.md)
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- [Upgrade Guide](./upgrade-guide.md)
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122
docs/disko-images.md
Normal file
122
docs/disko-images.md
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@ -0,0 +1,122 @@
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# Generating Disk Images with Secrets Included using Disko
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Using Disko on NixOS allows you to efficiently create `.raw` VM images from a
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system configuration. The generated image can be used as a VM or directly
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written to a physical drive to create a bootable disk. Follow the steps below to
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generate disk images:
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## Generating the `.raw` VM Image
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1. **Create a NixOS configuration that includes the disko and the disk
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configuration of your choice**
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In the this example we create a flake containing a nixos configuration for
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`myhost`.
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```nix
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# save this as flake.nix
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{
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description = "A disko images example";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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disko.url = "github:nix-community/disko";
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disko.inputs.nixpkgs.follows = "nixpkgs";
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};
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outputs = { self, disko, nixpkgs }: {
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nixosConfigurations.myhost = nixpkgs.lib.nixosSystem {
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system = "x86_64-linux";
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modules = [
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# You can get this file from here: https://github.com/nix-community/disko/blob/master/example/simple-efi.nix
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./simple-efi.nix
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disko.nixosModules.disko
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({ config, ... }: {
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# shut up state version warning
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system.stateVersion = config.system.nixos.version;
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# Adjust this to your liking.
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# WARNING: if you set a too low value the image might be not big enough to contain the nixos installation
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disko.devices.disk.vdb.imageSize = "10G";
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})
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];
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};
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};
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}
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```
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2. **Build the disko image script:** Replace `myhost` in the command below with
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your specific system configuration name:
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```console
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nix build .#nixosConfigurations.myhost.config.system.build.diskoImagesScript
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```
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3. **Execute the disko image script:** Execute the generated disko image script.
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Running `./result --help` will output the available options:
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```console
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./result --help
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Usage: $script [options]
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Options:
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* --pre-format-files <src> <dst>
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copies the src to the dst on the VM, before disko is run
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This is useful to provide secrets like LUKS keys, or other files you need for formating
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* --post-format-files <src> <dst>
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copies the src to the dst on the finished image
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These end up in the images later and is useful if you want to add some extra stateful files
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They will have the same permissions but will be owned by root:root
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* --build-memory
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specify the ammount of memory that gets allocated to the build vm (in mb)
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This can be usefull if you want to build images with a more involed NixOS config
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By default the vm will get 1024M/1GB
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* --write-to-disk </dev/disk>
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use an actuall disk instead of writing to a file
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This only works if your conifg has only one disk specified
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There is no check if the specified path is actually a disk so you can also write to another file
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```
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An example run may look like this:
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```
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sudo ./result --build-memory 2048
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```
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The script will generate the actual image outside of the nix store in the
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current working directory. The create image names depend on the names used in
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`disko.devices.disk` attrset in the NixOS configuration. In our code example it will
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produce the following image:
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```
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$ ls -la vdb.raw
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.rw-r--r-- root root 10 GB 2 minutes ago vdb.raw
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```
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## Additional Configuration
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- For virtual drive use, define the image size in your Disko configuration:
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```console
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disko.devices.disk.<drive>.imageSize = "32G"; # Set your preferred size
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```
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- If the `.raw` image size is not optimal, use `--write-to-disk` to write
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directly to a drive. This bypasses the `.raw` file generation, which saves on
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read/write operations and is suitable for single disk setups.
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## Understanding the Image Generation Process
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1. Files specified in `--pre-format-files` and `--post-format-files` are
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temporarily copied to `/tmp`.
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2. Files are then moved to their respective locations in the VM both before and
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after the Disko partitioning script runs.
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3. The NixOS installer is executed, having access only to `--post-format-files`.
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4. Upon installer completion, the VM is shutdown, and the `.raw` disk files are
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moved to the local directory.
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> **Note**: The auto-resizing feature is currently not available in Disko.
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> Contributions for this feature are welcomed. Adjust the `imageSize`
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> configuration to prevent issues related to file size and padding.
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By following these instructions and understanding the process, you can smoothly
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generate disk images with Disko for your NixOS system configurations.
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@ -42,125 +42,3 @@ Options:
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run with set -x
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```
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## Generating Disk Images with Secrets Included using Disko
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Using Disko on NixOS allows you to efficiently create `.raw` VM images from a
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system configuration. The generated image can be used as a VM or directly
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written to a physical drive to create a bootable disk. Follow the steps below to
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generate disk images:
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### Generating the `.raw` VM Image
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1. **Create a NixOS configuration that includes the disko and the disk
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configuration of your choice**
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|
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In the this example we create a flake containing a nixos configuration for
|
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`myhost`.
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```nix
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# save this as flake.nix
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{
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description = "A disko images example";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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disko.url = "github:nix-community/disko";
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disko.inputs.nixpkgs.follows = "nixpkgs";
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};
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outputs = { self, disko, nixpkgs }: {
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nixosConfigurations.myhost = nixpkgs.lib.nixosSystem {
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system = "x86_64-linux";
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modules = [
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# You can get this file from here: https://github.com/nix-community/disko/blob/master/example/simple-efi.nix
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./simple-efi.nix
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disko.nixosModules.disko
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({ config, ... }: {
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# shut up state version warning
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system.stateVersion = config.system.nixos.version;
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# Adjust this to your liking.
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# WARNING: if you set a too low value the image might be not big enough to contain the nixos installation
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disko.devices.disk.vdb.imageSize = "10G";
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})
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];
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};
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};
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}
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```
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2. **Build the disko image script:** Replace `myhost` in the command below with
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your specific system configuration name:
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```console
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nix build .#nixosConfigurations.myhost.config.system.build.diskoImagesScript
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```
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3. **Execute the disko image script:** Execute the generated disko image script.
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Running `./result --help` will output the available options:
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```console
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./result --help
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Usage: $script [options]
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Options:
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* --pre-format-files <src> <dst>
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copies the src to the dst on the VM, before disko is run
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This is useful to provide secrets like LUKS keys, or other files you need for formating
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* --post-format-files <src> <dst>
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copies the src to the dst on the finished image
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These end up in the images later and is useful if you want to add some extra stateful files
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They will have the same permissions but will be owned by root:root
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* --build-memory
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specify the ammount of memory that gets allocated to the build vm (in mb)
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This can be usefull if you want to build images with a more involed NixOS config
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By default the vm will get 1024M/1GB
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* --write-to-disk </dev/disk>
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use an actuall disk instead of writing to a file
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This only works if your conifg has only one disk specified
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There is no check if the specified path is actually a disk so you can also write to another file
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```
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An example run may look like this:
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```
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sudo ./result --build-memory 2048
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```
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The script will generate the actual image outside of the nix store in the
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current working directory. The create image names depend on the names used in
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`disko.devices.disk` attrset in the NixOS configuration. In our code example it will
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produce the following image:
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```
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$ ls -la vdb.raw
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.rw-r--r-- root root 10 GB 2 minutes ago vdb.raw
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```
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### Additional Configuration
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- For virtual drive use, define the image size in your Disko configuration:
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|
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```console
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disko.devices.disk.<drive>.imageSize = "32G"; # Set your preferred size
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```
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- If the `.raw` image size is not optimal, use `--write-to-disk` to write
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directly to a drive. This bypasses the `.raw` file generation, which saves on
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read/write operations and is suitable for single disk setups.
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|
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### Understanding the Image Generation Process
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1. Files specified in `--pre-format-files` and `--post-format-files` are
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temporarily copied to `/tmp`.
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2. Files are then moved to their respective locations in the VM both before and
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after the Disko partitioning script runs.
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3. The NixOS installer is executed, having access only to `--post-format-files`.
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4. Upon installer completion, the VM is shutdown, and the `.raw` disk files are
|
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moved to the local directory.
|
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|
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> **Note**: The auto-resizing feature is currently not available in Disko.
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> Contributions for this feature are welcomed. Adjust the `imageSize`
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> configuration to prevent issues related to file size and padding.
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|
||||
By following these instructions and understanding the process, you can smoothly
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generate disk images with Disko for your NixOS system configurations.
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