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Re: How to pick a kernel to boot ?

From: Prarit Bhargava
Subject: Re: How to pick a kernel to boot ?
Date: Thu, 24 Oct 2013 13:46:12 -0400
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110419 Red Hat/3.1.10-1.el6_0 Thunderbird/3.1.10

On 10/24/2013 12:44 PM, Lennart Sorensen wrote:
> On Thu, Oct 24, 2013 at 04:46:19PM +0200, Lukáš Czerner wrote:
>> Hi,
>> I have a simple question about grub2 which I can not find satisfying
>> answer to.
>> What is a proper way to pick a kernel to boot from in case I have
>> multiple kernels installed ? Note that picking the right kernel from
>> the menu is not an option I do not always have access to the
>> console.
>> With grub legacy, this was easy. Simply edit
>>  /boot/grub/menu.lst
>> and pick the right number. All the information I need are in that
>> file.
>> So what is a recommended way to do this with grub2 ?
> Same thing in /boot/grub/grub.cfg.  There is default with a number.

Sorry ... some how left the list off my initial reply ...

To set a default to boot, use

grub2-set-default  [kernel entry number]

To boot a kernel once and keep the default the same (ie, boot a kernel one time)

grub2-reboot [kernel entry number]

I've noticed a lot of people messing with /boot/grub2/grub.conf ... you
shouldn't have to do that to select a kernel to boot.


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