[TriLUG] Need Grub help

[Paul Boyle via TriLUG]

Thanks for the link Scott.

I got up to the part where it says to run grub2-install.  That failed, not surprisingly because this is an EFI system.  I followed the directions farther down regarding grub2-mkconfig.  I saw that the program found my kernel and initrd images.  When I tried to reboot it didn't work.  I found this page:

https://fedoraproject.org/wiki/GRUB_2

The bottom line from that page was don't use grub2-install on EFI systems.  There doesn't seem to be an analogous program for EFI system.  I tried a couple of time running grub2-config.  It could find the images, but couldn't boot.

I guess this will have to wait until I get back from vacation.  Thanks for your help.

Paul

________________________________________
From: Scott Lambdin <lopaki at gmail.com>
Sent: May 1, 2018 7:11 PM
To: Paul Boyle; Triangle Linux Users Group General Discussion
Subject: Re: [TriLUG] Need Grub help

Hi -

I think this looks pretty good for you:
https://www.thegeekdiary.com/centos-rhel-7-how-to-reinstall-grub2-from-rescue-mode/

--Scott

On Tue, May 1, 2018 at 6:02 PM, Paul Boyle via TriLUG <trilug at trilug.org<mailto:trilug at trilug.org>> wrote:
Hi,

I had the hard drive which contains the OS and distro (CENTOS 7) on one
of my student workstations fail (a hardware failure). /home is on a
separate drive which is OK. I was able to clone the image of the drive
to another hard drive (partitions look OK from gdisk). The cloned
partitions can be mounted via a harness on another Linux box.

The layout of the disk is:
/dev/sda1 -> /boot/efi (msdos(?))
/dev/sda2 -> /boot (ext4)
/dev/sda3 -> / (ext4)
/dev/sda4 -> Linux swap

I put the cloned drive into the PC. and when I try to boot I get an
error saying

"Reboot and select proper boot device
or Insert Boot media into selected boot device and press a key".

I'm thinking I need to run GRUB2 to make the system boot from new hard
drive.  However, I am befuddled by GRUB2.  Can someone suggest a
sensible course of action?

I'm thinking  putting a original CENTOS install DVD and
choosing the rescue option.  However, I don't know really what to do
after that.

Any help appreciated.

Reason to break out the world's smallest violins:  I'm scheduled to
start my vacation tomorrow and I would love to get this sorted out this
evening.

Thanks,

Paul

--
Paul D. Boyle, Ph. D.
Manager, X-ray Facility
Department of Chemistry
Western University
London, ON N6A 5B7
Canada
GPG Fingerprint: 8ECE 516D 9046 FE83 4A46  7E8E D720 555D 8CC3 EC6B

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