From Fedora Project Wiki
|description= This test case creates a dual boot system with two Fedoras of different release versions, using btrfs snapshots, works as expected |setup=
- Install Fedora 36. Any desktop, using Automatic partitioning.
- Freshen your backups, just in case
- Backup
/boot/efi, just in case
|actions=
- create a snapshot
- edit the dnfconf,
- dup the most recent bls snippet, modify its
rootflagsentry to match the snapshot name
|results=
- GRUB menu shows boot options: variant+version+kernelversion for switching between the two.
- Can also use
grubby --set-default=/boot/vmlinuz-5.18.15-200.fc36.x86_64
|limitations=
- /boot is only 1GiB by default, so this is the limiting factor right now, how many Fedoras you can have installed at one time. Two is safe. Three is iffy unless (a) configure the test Fedora instances' dnf.conf such that the kernel is excluded from updates; (b) consider deleting the "rescue" initramfs and kernel for the test instances, also removing
dracut-config-rescue-056-1.fc36.x86_64from them so these files aren't recreated; or (c) put /boot on a Btrfs subvolume.