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add sbctl + systemd-cryptenroll
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JMARyA 2024-12-16 16:20:32 +01:00
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technology/linux/mkinitcpio.md
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@ -1,5 +1,7 @@
---
obj: concept
arch-wiki: https://wiki.archlinux.org/title/Mkinitcpio
rev: 2024-12-16
---
# mkinitcpio
@ -8,20 +10,11 @@ The initial ramdisk is in essence a very small environment (early userspace) whi
## Configuration
The primary configuration file for _mkinitcpio_ is `/etc/mkinitcpio.conf`. Additionally, preset definitions are provided by kernel packages in the `/etc/mkinitcpio.d` directory (e.g. `/etc/mkinitcpio.d/linux.preset`).
`MODULES`
Kernel modules to be loaded before any boot hooks are run.
`BINARIES`
Additional binaries to be included in the initramfs image.
`FILES`
Additional files to be included in the initramfs image.
`HOOKS`
Hooks are scripts that execute in the initial ramdisk.
`COMPRESSION`
Used to compress the initramfs image.
- `MODULES` : Kernel modules to be loaded before any boot hooks are run.
- `BINARIES` : Additional binaries to be included in the initramfs image.
- `FILES` : Additional files to be included in the initramfs image.
- `HOOKS` : Hooks are scripts that execute in the initial ramdisk.
- `COMPRESSION` : Used to compress the initramfs image.
### MODULES
The `MODULES` array is used to specify modules to load before anything else is done.
@ -61,3 +54,28 @@ The default `HOOKS` setting should be sufficient for most simple, single disk se
| **lvm2** | Adds the device mapper kernel module and the `lvm` tool to the image. |
| **fsck** | Adds the fsck binary and file system-specific helpers to allow running fsck against your root device (and `/usr` if separate) prior to mounting. If added after the **autodetect** hook, only the helper specific to your root file system will be added. Usage of this hook is **strongly** recommended, and it is required with a separate `/usr` partition. It is highly recommended that if you include this hook that you also include any necessary modules to ensure your keyboard will work in early userspace. |
| **filesystems** | This includes necessary file system modules into your image. This hook is **required** unless you specify your file system modules in `MODULES`. |
### UKI
A Unified Kernel Image (UKI) is a single executable file that can be directly booted by UEFI firmware or automatically sourced by boot-loaders.
In essence, a UKI combines all the necessary components for the operating system to start up, including:
- EFI stub loader
- Kernel command line
- Microcode updates
- Initramfs image (initial RAM file system)
- Kernel image itself
- Splash screen
To enable the UKI edit `/etc/mkinitcpio.d/linux.preset`:
```sh
default_uki="/boot/EFI/Linux/arch-linux.efi"
fallback_uki="/boot/EFI/Linux/arch-linux-fallback.efi"
```
Build the Unified Kernel Image:
```sh
mkinitcpio --allpresets
```