Installation Notes:

QUICKSTART

Step 1)add the following to your /etc/yum.conf

[asl]
name=Atomicorp - $releasever - Security Kernels
baseurl=http://USERNAME:PASSWORD@atomicorp.com/channels/kernel/$releasever/

Replace USERNAME and PASSWORD with the login/password you selected for this server when you signed up.

Step 2) type: yum update

Step 3) reboot

Special instructions for testing:
Both the grub, and lilo bootloaders support the ability to only boot a kernel once for testing purposes. Power cycling the the system will restore the OS to using the 
original kernel. By default the kernel will install itself into grub, or lilo automatically.

Grub users:
Step 1) Once the Atomic kernel is installed, determine which position the Atomic kernel has been installed too, example:
[root@rh9 root]# vi /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.28-1.art)
        root (hd0,0)
        kernel /vmlinuz-2.4.28-1.art ro root=LABEL=/ hda=ide-scsi
        initrd /initrd-2.4.28-1.art.img
title Red Hat Linux (2.4.20-37.9.legacy)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-37.9.legacy ro root=LABEL=/ hda=ide-scsi
        initrd /initrd-2.4.20-37.9.legacy.img

Replace default=0, with the number of the kernel you want the system to boot by default (starting with 0 for the first position). In this example, the kernel 2.4.20-37.9.legacy will be the default, in position 1, as its reliability is known.
change the line: default=0 to default=1
Save the file and exit.

Step 2) type grub
[root@rh9 root]# grub
Probing devices to guess BIOS drives. This may take a long time.

Step 3) at the grub prompt type the following: savedefault --default=N --once
where N is the number of the kernel being tested, again, starting with 0
in our example, the Atomic kernel is in position 0, so --default=0

    GRUB  version 0.93  (640K lower / 3072K upper memory)

 [ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the possible
   completions of a device/filename.]

grub> savedefault --default=0 --once

Step 3) type quit

Step 4) reboot the system, it will now boot into the Atomic kernel. If for some reason the system does not work with the Atomic kernel, or is otherwise non-responsive, powercycling the system will restore it to the known working kernel selected in Step 1. Otherwise edit the /etc/grub.conf and set the system to boot into the Atomic kernel permenently.


Lilo Users can select a temporary kernel to boot with:
lilo -R <kernelname>

example:
lilo -R linux-smp