Step 2. Apply Ksplice updates to bring your kernel up to version 2.
Your system reboots (let's say due to a power failure):
Step 1. Boot your version 1 kernel. This boots because it's the same kernel you booted a year ago.
Step 2. (Before bringing up the network) Apply ksplice updates to bring your kernel to version 2. This works because you booted the same version 1 kernel, and the updates haven't changed either.
Step 1. Boot your version 1 kernel.
time passes, and version 2 is released
Step 2. Apply Ksplice updates to bring your kernel up to version 2.
Your system reboots (let's say due to a power failure):
Step 1. Boot your version 1 kernel. This boots because it's the same kernel you booted a year ago.
Step 2. (Before bringing up the network) Apply ksplice updates to bring your kernel to version 2. This works because you booted the same version 1 kernel, and the updates haven't changed either.