[CentOS] (re)load new kernel with rebooting host node?

JS jses27 at gmail.com
Wed Dec 2 20:28:12 UTC 2009

> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> Behalf Of Rudi Ahlers
> Sent: Wednesday, December 02, 2009 2:23 PM
> To: CentOS mailing list
> Subject: [CentOS] (re)load new kernel with rebooting host node?
> Hi all,
> Is it possible to reload the dom0 / host node's kernel with a newer
> one, without rebooting the server? I know kexec can do something like
> this for security patches, but I don't know much about kexec, and I
> don't want to mess up a production server either. So, has anyone done
> something like this before? I need to load a new kernel for one of the
> domU's iptables to work, but don't want to reboot the whole server and
> cause downtime for the other domU's.

You're a lot better off go over to the Linux Kernel Devel site. AFIK kexec
can only do this on real hardware. I think your better off scheduling
downtime for the server. Although kexec does have a site page. 


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