I'm sure its possible to upgrade via ISO, i've not tried but i've done many a box via yum. Here's some further reading:
http://www.centosforum.org/showthread.php?t=20 http://www.centos.org/modules/smartfaq/faq.php?faqid=20
On Sun, 30 Jan 2005 22:43:00 -0500, Edward J. Weinberg nylug@q5comm.com wrote:
Can you upgrade RH9 to Centos, or do you have to do a complete install?
Is there an iso with a .ks file on it to do a remote install?
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