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Issue #522 Reviewed partial proc_using-grub2-prompt.adoc
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Anthony McGlone
parent
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1 changed files with 73 additions and 17 deletions
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@ -4,13 +4,6 @@
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If improperly configured, *GRUB2* may fail to load and subsequently drop
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If improperly configured, *GRUB2* may fail to load and subsequently drop
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to a boot prompt. To boot into the system, proceed as follows:
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to a boot prompt. To boot into the system, proceed as follows:
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. Load the XFS and LVM modules
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----
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insmod xfs
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insmod lvm
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----
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. List the drives which *GRUB2* sees:
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. List the drives which *GRUB2* sees:
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----
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----
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@ -37,28 +30,91 @@ ls (hd0,1)/
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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.
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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.
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. Set the root partition.
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. Pre-boot procedure for BTRFS filesystems.
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* On BIOS systems:
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Set *GRUB2* root to your boot partition. If your boot partition is `(hd0,msdos1)`, the command will be:
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----
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----
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grub> set root=(hd0,3)
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set root=(hd0,msdos1)
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----
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Next, select the desired kernel. Set the root partition (e.g. `/dev/sda2`):
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----
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linux /vmlinuz-5.14.10-300.fc35.x86_64 root=/dev/sda2 ro rootflags=subvol=root
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----
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----
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This command tells the bootloader, that the root partition is the third partition on the first drive. This would correspond to the `/dev/sda3` device.
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. Set the desired kernel.
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* On UEFI systems:
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Set *GRUB2* root to your EFI system partition. If your EFI partition is `(hd0,gpt1)`, the command will be:
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----
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----
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grub> linux (hd0,1)/vmlinuz-3.0.0-1.fc16.i686 root=/dev/sda3 rhgb quiet selinux=0
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set root=(hd0,gpt1)
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# NOTE : add other kernel args if you need them
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# NOTE : change the numbers to match your system
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----
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----
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Next, select the desired kernel. Find the path to `vmlinuz` and set the root partition (e.g. `/dev/sda3`):
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linux (hd0,gpt2)/vmlinuz-5.14.10-300.fc35.x86_64 root=/dev/sda3 ro rootflags=subvol=root
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----
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Select the RAM filesystem that will be loaded:
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----
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initrd (hd0,gpt2)/initramfs-5.14.10-300.fc35.x86_64.img
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----
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. Set the desired `initrd`.
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. Pre-boot procedure for LVM filesystems.
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Load the `xfs` and `lvm` modules if they are not already loaded (check this with `lsmod`):
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----
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----
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grub> initrd (hd0,1)/initramfs-3.0.0-1.fc16.i686.img
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insmod xfs
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# NOTE : change the numbers to match your system
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insmod lvm
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----
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----
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* On BIOS systems:
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Set *GRUB2* root to your boot partition. If your boot partition is `(hd0,msdos1)`, the command will be:
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----
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set root=(hd0,msdos1)
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----
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Next, select the desired kernel. Set `root` to the `lvm` corresponding to the root directory:
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----
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linux /vmlinuz-3.0.0-1.fc16.i686 root=/dev/mapper/fedora_localhost--live-root
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----
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Select the RAM filesystem that will be loaded:
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----
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initrd /initramfs-3.0.0-1.fc16.i686.img
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----
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* On UEFI systems:
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Set *GRUB2* root to your EFI system partition. If your EFI partition is `(hd0,gpt1)`, the command will be:
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----
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set root=(hd0,gpt1)
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----
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Next, select the desired kernel. Find the path to `vmlinuz` and set `root` to the `lvm` corresponding to the root directory:
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----
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linux (hd0,gpt2)/vmlinuz-3.0.0-1.fc16.i686 root=/dev/mapper/fedora_localhost--live-root
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----
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Select the RAM filesystem that will be loaded:
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----
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initrd (hd0,gpt2)/initramfs-3.0.0-1.fc16.i686.img
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----
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. Boot with the selected settings.
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. Boot with the selected settings.
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