On Tuesday 08 June 2021 18:09:34 Martin McCormick wrote: > I did it! It works! > > Okay. Here's the short story. I read some more stuff > about building a boot drive for another system than the one being > used for the rescue. In this thread were the usual tales of woe > which I have also experienced when misusing grub such as "Oh > #%^*! Now I've got 2 systems that won't boot." a poster on that > thread states: > > I'm not a grub2 expert (sorry) but try adding --skip-fs-probe to > your grub-install line, I have found this prevents creation of > /boot/grub/device.map which can cause booting to a grub prompt. I > think that without this parameter grub-install, instead of doing what > you tell it, thinks it is cleverer than you, and may do something > different. > > Another thing is to be sure you are using the right grub-install > (i.e. for grub2 and not for original grub). This isn't a problem if > you are inside Centos but with SystemRecoveryCD both versions are > available and so you have to use grub2-install. I learned the hard > way... > > And as @wurtel pointed out (kudos), you should specify a drive not > a partition. Grub2 installs in sector 0 of the whole disk drive, and > this 'stub' is what runs at boot time, but it needs to know > whereabouts on the disk it should install the files for the next stage > of booting - this is what the --root-directory parameter is for. (I > think.) > > Reading man grub-install and googling I see that --root-directory > is not really meant to be used for grub2 versions 1.99++, though it > does work in my experience. You are meant to use --boot-directory and > refer to the actual boot directory, so this would give you: > grub-install /dev/sdb --skip-fs-probe > --boot-directory=/media/new_drive/boot > > End of quote > > I did the following: > > #!/bin/sh > #mount the drive being repaired. Uncomment lines as needed. > sudo mount /dev/sdd1 /mnt > cd /mnt/boot > #installing to the mounted disk > sudo grub-install \ > --skip-fs-probe \ > --boot-directory=/mnt/boot/ /dev/sdd > > When you boot your disk that starts out on /dev/sda1, > it's the first partition, in this case, so it will be /dev/sda1 > not /dev/sdd1 . This was quite a long thread and people were > remarking on how it is easy to get confused and do the wrong > thing. > > Anyway, It booted right up and then I discovered there > was no network. > > The network issue was only tangentially related because > the update-upgrade process also install some more strict and > modified ethernet interface naming rules and eth2 just doesn't > cut it any more. Now, it's enp0s17 on the system that just got > revived and enp0s18 or something similar on the system that got > the same upgrades but is a little newer and took the tharapy much > easier. Everything's working again at least in the Linux world. > > I saw this ad on TV for some product that is supposed to > improve brain function and memory but I can never remember it's > name. I could use a few more IQ points and things would flow a > little faster around here. > > Thanks for all the help, everybody.
I've found that a small vitamin b1 in your daily pilltainer seems to help. Its not magic, nothing is at 86, but it does seem to help the concentration. > Martin Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
