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AveryFreeman
Asked: 2022-02-22 14:51:14 +0800 CST

Ubuntu ZFS - /boot/efi/grub mounted at /boot/grub in fstab - normal?

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I'm noticing a "new" line in fstab I've never noticed before, and I'm wondering if it has to do with this installation being on ZFS

AFAICR /boot/grub has always existed independent of the efi partition, but in the case of this new installation, it lives on /dev/nvme0n1p1 (the efi partition) in /grub and then is bind mounted to /boot/grub

Here's the exact line in /etc/fstab:

UUID=B045-5C3B  /boot/efi       vfat    umask=0022,fmask=0022,dmask=0022      0       1
/boot/efi/grub  /boot/grub  none    defaults,bind   0   0

(efi mountpoint added for context)

Questions:

Is this normal behavior, and I just haven't noticed it before?

If this is not typical of "regular" Ubuntu installations, is there some reason Ubuntu on ZFS needs grub.cfg (et. al.) to be available in the efi partition during startup?

Thanks

grub2

1 Answers

  1. Yes that's the way the ZFS-root installer works. This makes GRUB's files accessible outside of ZFS, where it's probably easier to save menu state during boot.

    My system (Ubuntu Studio) was the same: Grub's binaries and configs are installed in /grub of the EFI partition. Then a bind mount is declared from /boot/efi/grub to /boot/grub in fstab.

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