Hi,
The mistake was EFI.
The source CentOS 7.7 machine was EFI boot.
and the destination CentOS 8 VM was non EFI.
Made a VM snapshot and wrote a script to install the packages one by one
and reboot each time.
The VM crashed at
grub2-efi-x64.x86_64
thanks.
--
Thomas Stephen Lee
On Wed, Oct 16, 2019 at 8:05 PM Ljubomir Ljubojevic <centos@xxxxxxxx> wrote:
> On 10/16/19 4:05 PM, Jonathan Billings wrote:
> > On Wed, Oct 16, 2019 at 04:00:20PM +0530, Thomas Stephen Lee wrote:
> >> Failed to switch root: Specified switch root path /sysroot does not
> seem to
> >> be an OS tree. os-release file is missing.
> >>
> >> What am I doing wrong?
> >
> > Tested, and yes, this happens after a reboot, grub2 isn't giving the
> > initrd a root disk to switch to.
> >
> > I had to edit the grub.cfg and add a single line,
> > set default_kernelopts="..."
> >
> > (using what was GRUB_CMDLINE_LINUX= was set in /etc/default/grub)
> >
> > I'm not exactly sure which package that was installed that caused
> > this.
> >
>
> Create a snapshot of clean VM and divide that list in 10 pieces and
> install them one at the time and reboot afterwards. If VM boots, create
> another snapshot. When it fails, reverse to previous snaphot and divide
> that segment into 5-10 smaller pieces, rinse and repeat.
>
> --
> Ljubomir Ljubojevic
> (Love is in the Air)
> PL Computers
> Serbia, Europe
>
> StarOS, Mikrotik and CentOS/RHEL/Linux consultant
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