[PLUG] CentOS kernel update puzzle regard grub.conf default kernel

[Galen Seitz]

I have two CentOS 5 machines that I just updated to 5.4.  On both 
machines the new kernel was inserted into the top of the list in 
grub.conf.  However, on one machine the default line in grub.conf was 
changed such that the old kernel would boot by default.  On the other, 
default was left at 0 so the new kernel would boot.  This is not the 
first time I've seen this behavior.  What controls whether the default 
gets changed on a kernel update?  I can't think of anything I would 
have done that would cause these two machines to behave differently.

thanks,
galen

-- 
Galen Seitz
galens at seitzassoc.com