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Krystian
Asked: 2017-06-10 23:56:02 +0800 CST

How to handle grub when adding new system and removing old one?

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I want to upgrade my Proxmox cluster from 2.2 to 4. I think I have this well thought, but there's one thing I am not sure of.

Currently, my installation runs on LVM A. I have added few new disks and created LVM B. I would like to install the new system on LVM B, migrate the virtual servers there and only after I make sure everything works [it's kind of a big leap] I will want to salvage the old drives.

After installing the new system, I understand that I will be editing the /etc/grub.d/10_linux file on the old system in order to be able to boot the new installation. Once everything works, how do I move the config to the new installation and ensure that it works after I remove the old drives?

installation

1 Answers

  1. Best Answer

    GRUB's configuration is actually in /boot/grub/grub.cfg created by grub-mkconfig from the configuration files in /etc/grub.d/. See GRUB Simple configuration.

    You can install GRUB to the new drive (say /dev/sdb) by booting into the operating system in there. From that OS, install GRUB with:

    sudo grub-install /dev/sdb

    If that doesn't work directly and you get errors, proceed with:

    sudo grub-install --recheck /dev/sdb
sudo update-grub

    Finally get GRUB to remember where it should reinstall on updates. Choose the correct drive in:

    sudo dpkg-reconfigure grub-pc
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