Re: RHEL 8 keeps auto-mounting /boot everytime the partition is modified

Most likely, you've still got /boot set to auto in /etc/fstab, so=20
systemd is remounting it, automatically.

Try either removing "auto" from the /boot entry or comment it out in=20
/etc/fstab, then run systemctl daemon-reload.

On 2025-01-09 14:39, Nicolas C. wrote:
> Hi,
>=20
> I'm currently writing a script to convert a VM from BIOS (legacy) to=20
> EFI. On my VMs I have a dedicated disk for /boot and I need to perfom=20
> some operations *while it's not mounted* on it to make it EFI-capable.
>=20
> It's working fine on Debian 11 & 12 and OracleLinux/RHEL 9 but on RHEL=20
> 8 the system keeps automatically mounting /boot each time I make change=
=20
> to the disk or partition (e.g. after running "sfdisk") even though I=20
> unmounted it. I see there is a "boot.automount" unit but I can't fine=20
> much info about it.
>=20
> I've tried disabling the "boot.mount" unit, but it keeps getting=20
> mounted. The only workaround I found was to comment the entry in my=20
> fstab with sed and event with this the system keep trying to mount it=20
> (!) but fails.
>=20
> Any idea why this happens?
>=20
> Thanks,
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> Disk /dev/sda: 1 GiB, 1073741824 bytes, 2097152 sectors
> Units: sectors of 1 * 512 =3D 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: dos
> Disk identifier: 0x8e565d9c
>=20
> Device     Boot Start     End Sectors  Size Id Type
> /dev/sda1  *     2048 2097151 2095104 1023M 83 Linux
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> umount /boot
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> resize2fs /dev/sda1 987136K
>=20
> echo ",51200K" | sfdisk --force -N 1 /dev/sda
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> Result:
>=20
> Jan  9 20:21:49 rhel8-efi kernel: sda: sda1
> Jan  9 20:21:49 rhel8-efi systemd[1]:=20
> systemd-fsck@dev-disk-by\x2duuid-a210ff5a\x2de2fb\x2d400d\x2d86b5\x2de195=
74763bf5.service:=20
> Succeeded.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Stopped File System Check on=20
> /dev/disk/by-uuid/a210ff5a-e2fb-400d-86b5-e19574763bf5.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Condition check resulted in=20
> Virtual_disk being skipped.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Condition check resulted in=20
> Virtual_disk being skipped.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Condition check resulted in=20
> Virtual_disk being skipped.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Condition check resulted in=20
> Virtual_disk being skipped.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Condition check resulted in=20
> Virtual_disk being skipped.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Condition check resulted in=20
> Virtual_disk being skipped.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Starting File System Check on=20
> /dev/disk/by-uuid/a210ff5a-e2fb-400d-86b5-e19574763bf5...
> Jan  9 20:21:49 rhel8-efi systemd-fsck[11519]: /dev/sda1=C2=A0: propre,=
=20
> 323/65536 fichiers, 57178/246784 blocs
> Jan  9 20:21:49 rhel8-efi systemd[1]: Started File System Check on=20
> /dev/disk/by-uuid/a210ff5a-e2fb-400d-86b5-e19574763bf5.
> Jan  9 20:21:49 rhel8-efi systemd[1]: Mounting /boot...
> Jan  9 20:21:49 rhel8-efi kernel: EXT4-fs (sda1): mounted filesystem=20
> with ordered data mode. Opts: discard
> Jan  9 20:21:49 rhel8-efi systemd[1]: Mounted /boot.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> systemctl list-units --all boot.automount
>   UNIT           LOAD      ACTIVE   SUB  DESCRIPTION
>=20
>=20
> =E2=97=8F boot.automount not-found inactive dead boot.automount
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> systemctl status boot.automount
> Unit boot.automount could not be found.
>=20
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just
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