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Small update (on reviewed grub articles) for consistency/style guidelines

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Anthony McGlone 2023-01-30 12:36:20 +00:00
parent 0271c0015e
commit 322b9557da
5 changed files with 116 additions and 93 deletions
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4
modules/ROOT/pages/_partials/proc_adding-other-operating-systems-grub2.adoc
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@ -19,12 +19,12 @@ Adding other records into the *GRUB2* menu only means to run `grub2-mkconfig` co
----
. Install *GRUB2*.
* On UEFI systems:
* On UEFI systems.
+
----
# dnf reinstall shim-* grub2-efi-* grub2-common
----
* On BIOS systems, specify the disk where the bootloader should be installed:
* On BIOS systems, specify the disk where the bootloader should be installed.
+
----
# grub2-install /dev/sda

4
modules/ROOT/pages/_partials/proc_booting-with-configfile-on-different-partition.adoc
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@ -9,13 +9,13 @@ if you need to boot from a configuration file on a different partition.
. Load the necessary modules to read your system's partitions (you will also need to load `part_msdos` or `part_gpt`, depending on your partition table).
+
* For BTRFS filesystems:
* For BTRFS filesystems.
+
----
grub> insmod btrfs
----
+
* For LVM filesystems:
* For LVM filesystems.
+
----
grub> insmod xfs

2
modules/ROOT/pages/_partials/proc_installing-grub2-on-bios-system.adoc
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@ -7,7 +7,7 @@ This procedure shows the steps to install *GRUB2* on your _Master Boot Record_ (
.Before you start
* Make sure you have the the *GRUB2* packages and the _os-prober_ package installed in your system:
* Make sure you have the the *GRUB2* packages and the _os-prober_ package installed in your system.
+
----
$ dnf list installed | grep grub

121
modules/ROOT/pages/_partials/proc_restoring-bootloader-using-live-disk.adoc
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@ -33,15 +33,15 @@ bootable by *GRUB2*.
[[btrfs-steps]]
== BTRFS steps
If your `/root` partition is encrypted by LUKS, it must be decrypted:
. If your `/root` partition is encrypted by LUKS, it must be decrypted.
. Make sure the crypt module is in use:
.. Make sure the crypt module is in use.
+
----
# modprobe dm-crypt
----
. Decrypt the `/root` partition (e.g. `/dev/sda3`):
.. Decrypt the `/root` partition (e.g. `/dev/sda3`).
+
----
# cryptsetup luksOpen /dev/sda3 myvolume
@ -49,105 +49,107 @@ If your `/root` partition is encrypted by LUKS, it must be decrypted:
+
The decrypted device (i.e. `myvolume`) will be accessible under `/dev/mapper/`.
Mount the `/root` partition:
. Mount the `/root` partition.
* For LUKS:
* For LUKS.
+
----
# mount /dev/mapper/myvolume /mnt -o subvol=root
----
* For non-LUKS:
* For non-LUKS.
+
----
# mount /dev/sda3 /mnt -o subvol=root
----
+
Mount the `/boot` partition (e.g. `/dev/sda2)`:
. Mount the `/boot` partition (e.g. `/dev/sda2)`.
+
----
# mount /dev/sda2 /mnt/boot
----
+
Mount system processes and devices into the `/root` filesystem:
. Mount system processes and devices into the `/root` filesystem.
+
----
# mount -o bind /dev /mnt/dev
# mount -o bind /proc /mnt/proc
# mount -o bind /sys /mnt/sys
# mount -o bind /run /mnt/run
----
On UEFI systems, bind the `efivars` directory and mount the EFI system partition (e.g. `/dev/sda1`):
+
. On UEFI systems, bind the `efivars` directory and mount the EFI system partition (e.g. `/dev/sda1`).
+
----
# mount -o bind /sys/firmware/efi/efivars /mnt/sys/firmware/efi/efivars
# mount /dev/sda1 /mnt/boot/efi
----
Change your filesystem to the one mounted under `/mnt/`:
+
. Change your filesystem to the one mounted under `/mnt/`.
+
----
# chroot /mnt/
----
+
. Re-install *GRUB2*.
Re-install GRUB:
* On UEFI systems, several packages are required:
* On UEFI systems, several packages are required.
+
----
/]# dnf reinstall shim-* grub2-efi-* grub2-common
----
* On BIOS systems, specify the disk (e.g. `/dev/sda`) where GRUB should be installed:
* On BIOS systems, specify the disk (e.g. `/dev/sda`) where *GRUB2* should be installed.
+
----
/]# grub2-install /dev/sda
----
Re-generate the GRUB configuration file:
+
. Re-generate the *GRUB2* configuration file.
+
----
/]# grub2-mkconfig -o /boot/grub2/grub.cfg
----
Sync and exit the chroot:
+
. Sync and exit the chroot.
+
----
/]# sync && exit
----
Reboot the system.
+
. Reboot the system.
[[lvm-steps]]
== LVM steps
If your `/root` partition is encrypted by LUKS, it must be decrypted:
. If your `/root` partition is encrypted by LUKS, it must be decrypted.
. Make sure the crypt module is in use:
.. Make sure the crypt module is in use.
+
----
# modprobe dm-crypt
----
. Decrypt the `/root` partition (e.g. `/dev/sda3`):
.. Decrypt the `/root` partition (e.g. `/dev/sda3`).
+
----
# cryptsetup luksOpen /dev/sda3 myvolume
----
. Scan the LVM volumes for the volume group corresponding to the `/root` partition:
.. Scan the LVM volumes for the volume group corresponding to the `/root` partition.
+
----
# vgscan
----
. Activate the volume group (e.g. `fedora_localhost-live`):
.. Activate the volume group (e.g. `fedora_localhost-live`).
+
----
# vgchange -ay fedora_localhost-live
----
. Find the logical volume corresponding to `/root`:
.. Find the logical volume corresponding to `/root`.
+
----
# lvs
@ -155,64 +157,65 @@ If your `/root` partition is encrypted by LUKS, it must be decrypted:
+
The logical volume will be accessible under `/dev/mapper/`.
Create a `root` directory under `/mnt`:
. Create a `root` directory under `/mnt`.
+
----
# mkdir -p /mnt/root
----
Mount the logical volume (e.g. `/dev/mapper/fedora_localhost--live-root`) corresponding to the `/root` partition:
+
. Mount the logical volume (e.g. `/dev/mapper/fedora_localhost--live-root`) corresponding to the `/root` partition.
+
----
# mount /dev/mapper/fedora_localhost--live-root /mnt/root
----
Mount the `/boot` partition (e.g. `/dev/sda2`):
+
. Mount the `/boot` partition (e.g. `/dev/sda2`).
+
----
# mount /dev/sda2 /mnt/root/boot
----
Mount system processes and devices into the `/root` filesystem:
+
. Mount system processes and devices into the `/root` filesystem.
+
----
# mount -o bind /dev /mnt/root/dev
# mount -o bind /proc /mnt/root/proc
# mount -o bind /sys /mnt/root/sys
# mount -o bind /run /mnt/root/run
----
On UEFI systems, bind the `efivars` directory and mount the EFI system partition (e.g. `/dev/sda1`):
+
. On UEFI systems, bind the `efivars` directory and mount the EFI system partition (e.g. `/dev/sda1`).
+
----
# mount -o bind /sys/firmware/efi/efivars /mnt/root/sys/firmware/efi/efivars
# mount /dev/sda1 /mnt/root/boot/efi
----
Change your filesystem to the one mounted under `/mnt/root`:
+
. Change your filesystem to the one mounted under `/mnt/root`.
+
----
# chroot /mnt/root/
----
+
. Re-install *GRUB2* and re-generate the *GRUB2* configuration file.
Re-install GRUB and re-generate the GRUB configuration file:
* On UEFI systems, several packages are required:
* On UEFI systems, several packages are required.
+
----
/]# dnf reinstall shim-* grub2-efi-* grub2-common
/]# grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
----
* On BIOS systems, specify the disk (e.g. `/dev/sda`) where GRUB should be installed:
* On BIOS systems, specify the disk (e.g. `/dev/sda`) where *GRUB2* should be installed.
+
----
/]# grub2-install /dev/sda
/]# grub2-mkconfig -o /boot/grub2/grub.cfg
----
Sync and exit the chroot:
+
. Sync and exit the chroot.
+
----
/]# sync && exit
----
Reboot the system.
+
. Reboot the system.

78
modules/ROOT/pages/_partials/proc_using-grub2-prompt.adoc
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@ -6,19 +6,34 @@ to a boot prompt. To boot into the system, follow the steps below.
.Procedure
. List the drives which *GRUB2* sees:
. Load the necessary modules to read your system's partitions (you will also need to load `part_msdos` or `part_gpt`, depending on your partition table).
+
* For BTRFS filesystems (Fedora 33 or newer).
+
----
grub> insmod btrfs
----
+
* For LVM filesystems (older than Fedora 33).
+
----
grub> insmod xfs
grub> insmod lvm
----
. List the drives which *GRUB2* sees.
+
----
grub> ls
----
. Examine the output to understand the partition table of the `/dev/sda` device. The following example shows a DOS partition table with three partitions:
. Examine the output to understand the partition table of the `/dev/sda` device. The following example shows a DOS partition table with three partitions.
+
----
(hd0) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1)
----
+
A GPT partition table of the `/dev/sda` device with four partitions could look like this:
A GPT partition table of the `/dev/sda` device with four partitions could look like this.
+
----
(hd0) (hd0,gpt4) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1)
@ -32,7 +47,7 @@ grub> ls (hd0,1)/
+
The outcome of the previous command will list the files on `/dev/sda1`. The partition that contains the `/boot` directory is the correct one. There you will search for the full names of the `vmlinuz` and `initramfs` files.
. Follow the <<btrfs-boot-setup, Pre-boot setup for BTRFS>> (Fedora 33 or newer) or the <<lvm-boot-setup, Pre-boot setup for LVM>> (older than Fedora 33) to recover your system.
. Follow the <<btrfs-boot-setup, Pre-boot setup for BTRFS>> or the <<lvm-boot-setup, Pre-boot setup for LVM>> to recover your system.
. After the pre-boot setup, boot the system.
+
@ -40,39 +55,44 @@ The outcome of the previous command will list the files on `/dev/sda1`. The part
grub> boot
----
. To restore the bootloader's functionality, regenerate the *GRUB2* configuration file and reinstall the bootloader into the MBR, as described in xref:adding-other-operating-systems-grub2[Adding other operating systems to the *GRUB2* menu].
. To restore the bootloader's functionality, regenerate the *GRUB2* configuration file and reinstall the bootloader, as described in xref:adding-other-operating-systems-grub2[Adding other operating systems to the *GRUB2* menu].
[[btrfs-boot-setup]]
== Pre-boot setup for BTRFS filesystems.
* On BIOS systems:
+
Set *GRUB2* root to your `/boot` partition. If your `/boot` partition is `(hd0,msdos1)`, the command will be:
* On BIOS systems.
. Set *GRUB2* root to your `/boot` partition. If your `/boot` partition is `(hd0,msdos1)`, the command will be.
+
----
grub> set root=(hd0,msdos1)
----
Next, select the desired kernel. Set the `/root` partition (e.g. `/dev/sda2`):
+
. Next, select the desired kernel. Set the `/root` partition (e.g. `/dev/sda2`).
+
----
grub> linux /vmlinuz-5.14.10-300.fc35.x86_64 root=/dev/sda2 ro rootflags=subvol=root
----
+
* On UEFI systems:
+
Set *GRUB2* root to your EFI system partition. If your EFI system partition is `(hd0,gpt1)`, the command will be:
* On UEFI systems.
. Set *GRUB2* root to your EFI system partition. If your EFI system partition is `(hd0,gpt1)`, use this command.
+
----
grub> set root=(hd0,gpt1)
----
Next, select the desired kernel. Find the path to `vmlinuz` and set the `/root` partition (e.g. `/dev/sda3`):
+
. Next, select the desired kernel. Find the path to `vmlinuz` and set the `/root` partition (e.g. `/dev/sda3`).
+
----
grub> linux (hd0,gpt2)/vmlinuz-5.14.10-300.fc35.x86_64 root=/dev/sda3 ro rootflags=subvol=root
----
+
Select the RAM filesystem that will be loaded:
. Select the RAM filesystem that will be loaded.
+
----
grub> initrd (hd0,gpt2)/initramfs-5.14.10-300.fc35.x86_64.img
@ -81,46 +101,46 @@ grub> initrd (hd0,gpt2)/initramfs-5.14.10-300.fc35.x86_64.img
[[lvm-boot-setup]]
== Pre-boot setup for LVM filesystems.
Load the `xfs` and `lvm` modules if they are not already loaded (check this with `lsmod`):
----
grub> insmod xfs
grub> insmod lvm
----
* On BIOS systems.
* On BIOS systems:
+
Set *GRUB2* root to your `/boot` partition. If your `/boot` partition is `(hd0,msdos1)`, the command will be:
. Set *GRUB2* root to your `/boot` partition. If your `/boot` partition is `(hd0,msdos1)`, use this command.
+
----
grub> set root=(hd0,msdos1)
----
Next, select the desired kernel. Set `root` to the logical volume that corresponds to the `/root` directory:
+
. Next, select the desired kernel. Set `root` to the logical volume that corresponds to the `/root` directory.
+
----
grub> linux /vmlinuz-3.0.0-1.fc16.i686 root=/dev/mapper/fedora_localhost--live-root
----
+
Select the RAM filesystem that will be loaded:
. Select the RAM filesystem that will be loaded.
+
----
grub> initrd /initramfs-3.0.0-1.fc16.i686.img
----
+
* On UEFI systems:
+
Set *GRUB2* root to your EFI system partition. If your EFI system partition is `(hd0,gpt1)`, the command will be:
* On UEFI systems.
. Set *GRUB2* root to your EFI system partition. If your EFI system partition is `(hd0,gpt1)`, use this command.
+
----
set root=(hd0,gpt1)
----
Next, select the desired kernel. Find the path to `vmlinuz` and set `root` to the logical volume that corresponds to the `/root` directory:
+
. Next, select the desired kernel. Find the path to `vmlinuz` and set `root` to the logical volume that corresponds to the `/root` directory.
+
----
linux (hd0,gpt2)/vmlinuz-3.0.0-1.fc16.i686 root=/dev/mapper/fedora_localhost--live-root
----
+
Select the RAM filesystem that will be loaded:
. Select the RAM filesystem that will be loaded.
+
----
initrd (hd0,gpt2)/initramfs-3.0.0-1.fc16.i686.img