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Still cannot make up a good note-taking habit especially that I archive more than taking notes. Though, this same cannot be said for my course notes so that's a plus.
58 lines
2.1 KiB
Org Mode
58 lines
2.1 KiB
Org Mode
:PROPERTIES:
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:ID: 8505f1f0-f15b-4b04-91fc-12be01913ce6
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:END:
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#+title: systemd-boot
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#+date: 2021-08-07 20:08:09 +08:00
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#+date_modified: 2022-05-22 21:24:33 +08:00
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#+language: en
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systemd also comes with a bootloader aptly named =systemd-boot= though it only supports UEFI-based firmware.
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Just like GRUB, they can be configured through plain-text files.
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For detailed information about the bootloader, see the manual page =systemd-boot.7=.
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With a complete installation, the bootloader config folder may look like the following list.
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#+begin_src
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/boot/
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`-- loader
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|-- entries # (ref:loader-entries)
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| `-- arch.conf
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|-- loader.conf # (ref:loader-conf)
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`-- random-seed
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#+end_src
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- [[(loader-entries)][=loader/entries/=]] is a directory containing all of the entries available to be booted.
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- [[(loader-conf)][=loader.conf=]] contains the loader configuration.
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Most Linux distros with systemd installed should have a sample config file somewhere. [fn:: In case of Arch Linux, it has an example file at =/usr/share/systemd/bootctl/=.]
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As an example, we'll show what those look like.
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=loader.conf= is the configuration for the boot loader including the timeout seconds among others.
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Here is a sample of a bootloader configuration.
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#+begin_src
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default arch
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timeout 4
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#+end_src
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In this config, this simply makes the =arch= loader entry to be default when no actions has occurred.
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It will start loading it automatically after a timeout of 4 seconds.
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The =arch= loader entry can be found at =${ESP}/loader/entries/arch.conf=.
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The following code block shows what a loader entry looks like.
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#+begin_src
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title Arch Linux
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linux /vmlinuz-linux
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initrd /initramfs-linux.img
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options root="PARTUUID=${PARTUUID}"
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#+end_src
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You can customize and create extra entries for the same installation.
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This is what [[id:7e8e83d5-4b08-44f6-800d-a322f6960a62][NixOS]] does with its system generations, letting the user to boot to a specific point in time from the boot loader.
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Very useful for emergency boots in case the current generation breaks for whatever reason.
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For complete details of the configuration file, you can see =loader.conf.5= manual page.
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