CentOS6.2: installation at specific kernel level

[Cal Sawyer <cal-s@xxxxxxxxxxxxx>]

Hi, all

I have a number of machines that are out of sync with one another by
virtue of having done a yum update after a base 6.2 install at different
times (all were previous CentOS 5.3)  Consequently, systems are a mix of
2.6.32-220.7.1, 2.6.32-220.13.1 or 2.6.32-220.17.1.

So 2 questions: 
   -  Is it possible to perform a yum update (or another other kind of
update), specifying installation of, say, kernel 2.6.32-220.17.1 along
with the packages that were relevant at the time when 2.6.32-220.17.1
was current?
   -  Is it possible to capture and save for future installations the
current kernel rev and associated packages as exist in the repos today
and install as a "frozen-in-time" distribution?

thanks!

- c sawyer
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