Red Hat ENTERPRISE LINUX 4 System Administration Manual page 354

Chapter 36. Manually Upgrading the Kernel
image=/vmlinux--2.6.9-5.EL
label=old
read-only
initrd=/initrd--2.6.9-5.EL.img
append="root=LABEL=/"
image=/vmlinux-2.6.9-5.EL
label=linux
read-only
initrd=/initrd-2.6.9-5.EL.img
append="root=LABEL=/"
Notice that the default is not set to the new kernel. The kernel in the first image is booted by default.
To change the default kernel to boot either move its image stanza so that it is the first one listed or add
the directive default and set it to the label of the image stanza that contains the new kernel.
Begin testing the new kernel by rebooting the computer and watching the messages to ensure that the
hardware is detected properly.
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