[syslinux] Re: Boot Linux from Linux

[H. Peter Anvin]

Henrik Lassen wrote:
> Dear Mr. H
> 
>               AGAIN:   THANKS FOR YOUR PRODUCT!
> 
> I am building a Beowulf Cluster for Meteorological Simulations (DK government) and must boot the buggers over and over again.
> 
> At present boot and configure nodes in 3:40 min. 
>  
> Fault tolerans and speed
> 
> 1.	I can now promote a node to master (BOOTP/TFTP/NFS/Repository...). 
> 2.	I can now push Repository to secret partition nodes and boot from the secret partition.
> 
> I checked the KEXEC stuff and wondered that must be something you have been following.
>  
> How would the call look like (i know its stupid but I really would like to understand this stuff nad how your SW could work:
>  
>     kexec -debug PXELINUX.0 SYSLINUX.CNF
>

kexec runs a Linux kernel directly.  It doesn't use PXELINUX or syslinux 
or anything like that, which are for from-scratch boots.

I'm a bit nervous about people using kexec when they really should be 
rebooting, because of the "bug in the kernel three generations ago" 
problem, however, there are uses where I think that can be useful.

	-hpa