ELRepo GPG key

If you get the following error message:

GPG key at file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org (0xBAADAE52) is already installed
The GPG keys listed for the "ELRepo.org Community Enterprise Linux Kernel Repository - el8" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.. Failing package is: python3-perf-6.13.2-1.el8.elrepo.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: GPG check FAILED

The answer is:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-v2-elrepo.org

See https://elrepo.org/wiki/doku.php?id=start

grub2 vs xfs

So I just tried

# grub2-install --boot-directory=/boot2 /dev/sdb1
Installing for i386-pc platform.
grub2-install: error: hd0 appears to contain a xfs filesystem which isn't known to reserve space for DOS-style boot.  Installing GRUB there could result in FILESYSTEM DESTRUCTION if valuable data is overwritten by grub-setup (--skip-fs-probe disables this check, use at your own risk).

And then I did

# grub2-install --boot-directory=/boot2 /dev/sdb1 --skip-fs-probe
Installing for i386-pc platform.
grub2-install: warning: File system `xfs' doesn't support embedding.
grub2-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
grub2-install: error: will not proceed with blocklists.

But of course I'm an idiot; I don't want to install the grub loader on sdb1, I want to install it on sdb, where the BIOS can actually find it

# grub2-install --boot-directory=/boot2 /dev/sdb
Installing for i386-pc platform.
Installation finished. No error reported.