If you are using GRUB 0.97 (legacy GRUB), then this capability is provided by the "default saved" and "fallback" commands. See sections 4.3.1 and 4.3.2 in the manual:

http://www.gnu.org/software/grub/manual/legacy/grub.html

-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Tony Mountifield Sent: 15 December 2014 11:01 To: centos@centos.org Subject: [CentOS] One-time reboot into alternate kernel?

Apologies if this should be well-known, but I couldn't find anything!

Situation: a system in a remote location, with no KVM, IPMI or iLO, and therefore no console access, only ssh. Multiple kernels listed in grub.conf.

Is there a way to reboot temporarily into one of the other kernels

listed

in grub.conf, without changing the default= line, so that a subsequent reboot will default back to the original kernel?

The problem I have is that having changed the default= line to select a kernel that doesn't boot properly, I need to have someone visit the console in order manually to select the working kernel again. I would like to avoid that situation if possible.

Thanks, Tony -- Tony Mountifield Work: tony@softins.co.uk - http://www.softins.co.uk Play: tony@mountifield.org - http://tony.mountifield.org _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

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