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f2a2581b85
Why this change is needed: With the new default system in BTRF as Defautl for new instalation this procedure needs updated. What this change accomplishes: . Reflect the diferences between rescue a system in a LVM/BTRF file System. . Remove Sequence Number Warninig in a debug-dracut-problems.adoc fix ticket: #316 Note: Please don't push .adoc with Warning Messages is quite anoying
104 lines
2.6 KiB
Text
104 lines
2.6 KiB
Text
[[restoring-bootloader-using-live-disk]]
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= Restoring the bootloader using the Live disk.
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Sometimes, especially after a secondary operating systems has been installed,
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the master boot record gets damaged which then prevents the original Linux system
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from booting.
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If this happens, it is necessary to reinstall *GRUB2* to recreate the original
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settings. The process not only discovers all installed operating systems, but
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usually adds them to the *GRUB2* configuration files, so they will all become
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bootable by *GRUB2*.
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.Before you start
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* Get the Fedora Live ISO from link:https://download.fedoraproject.org/pub/fedora/linux/releases/[getfedora.org].
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* Prepare a bootable device using the downloaded ISO, either a CD or a USB.
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.Procedure
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. Boot the Fedora live system from the bootable device you have created.
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. Open the terminal.
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. Examine the partition layout and identify the `boot` and the `root` partition.
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----
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# fdisk -l
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----
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== For Default Instalation in LVM.
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. Create the mount point for the root partition.
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+
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----
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# mkdir -p /mnt/root
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----
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If you are using the default Fedora layout, there will be one `/dev/sda1`
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partition that holds the `/boot` directory and one `/dev/mapper/fedora-root`
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that holds the root file system.
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. Mount the root partition on the mount point.
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+
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----
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# mount /dev/mapper/fedora-root /mnt/root
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----
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. Mount the boot partition in the `boot` directory of the filesystem that you have mounted in the previous step.
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----
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# mount /dev/sda1 /mnt/root/boot/
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----
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== For default Instalation in BTRF
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. Create the mount point for the root partition.
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----
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# mkdir -p /mnt/
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----
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If you are using the default Fedora layout, there will be one `/dev/sda1`
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partition that holds the `/boot` directory and one `/dev/sda2` that holds the root file system.
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----
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# mount /dev/sda2/ /mnt
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# mount /dev/sda1 /mnt/root/boot
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----
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IMPORTANT: Home Partition is mounted automatically under `/mnt/home`
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== Continue with the follow Procedure.
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. Mount system processes and devices into the root filesystem in
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`/mnt/root`.
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+
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----
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# mount -o bind /dev /mnt/root/dev
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# mount -o bind /proc /mnt/root/proc
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# mount -o bind /sys /mnt/root/sys
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# mount -o bind /run /mnt/root/run
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----
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. Change your filesystem into the one mounted under `/mnt/root`.
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+
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----
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# chroot /mnt/root
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----
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. Regenerate the *GRUB2* configuration file and reinstall the bootloader
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into the MBR, as described in xref:adding-other-operating-systems-grub2[Adding other operating systems to the *GRUB2* menu].
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. Exit this temporary root filesystem.
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+
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----
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$ exit
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----
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. Your bootloader should be now restored. Reboot your computer to boot into your normal system.
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----
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# systemctl reboot
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----
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