If you need to rescue a system, e.g. reinstall GRUB, you might need to boot from a USB stick, assemble the broken system, and chroot into it, in order to run repair commands. But the familiar /boot, /etc, /home, /var, /usr directories aren’t visible when mounting a Fedora root file system. How do I do that?
Option 1: Use a netinstall image
These images start-up with a boot menu containing a Troubleshooting submenu, and one of the options is to rescue a Fedora system. This runs Anaconda in rescue mode. It will look at the drive for system roots, mount them, find fstab and assemble your system at
/mnt/sysimage. Now you can just
Option 2: Use your anaconda storage.log as a guide
sudo grep mount /var/log/anaconda/storage.log
The basic strategy is:
mount -o subvol=root /dev/vda3 /mnt/sysimage mount /dev/vda2 /mnt/sysimage/boot mount -o umask=0077,shortname=winnt /dev/vda1 /mnt/sysimage/boot/efi mount -B /dev /mnt/sysimage/dev mount -B /proc /mnt/sysimage/proc mount -B /sys /mnt/sysimage/sys chroot /mnt/sysimage
Extra info: The key thing that makes Btrfs different is the use of the
subvol mount option. By default, the name of this subvolume is root. But in a custom installation it could be anything you want, so you 'd need to use the correct name. Everything you’d find in sysroot is found in this subvolume, similar to Fedora 32 and older, there was a fedora-root Logical Volume.
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