[CentOS] Kernel

[Barry Brimer]

> my server is in remote location, and I don't see any grub screen, so I was 
> wondering
> if there is an option that I can specify the kernel that Linux to be booted 
> at the reboot time,
> some thing like shutdown -g0 -i6 which_kernel-options

This is handled by your bootloader, which is grub.  In your /etc/grub.conf 
file, there is a line that says "default=x" where x is the number of the 
section from the top of the file, starting with 0.  You can also use the 
"fallback=x" statement to boot a different kernel in case the default 
kernel is unable to boot.

If you really want to be able to specify which kernel will be booted on 
the next boot (and only the next boot) you can install the lilo boot 
loader and use "lilo -R <image title>" and the next time the system is 
booted, it will use that kernel, but all other times it will use the 
default kernel.  If you are not familiar with lilo, I strongly recommend 
that you install it on a machine locally and use it there until you are 
comfortable with it before deploying it to a machine at a remote data 
center.

Hope this helps,
Barry