[CentOS] Nightly yum update did an "upgrade"

[Akemi Yagi]

On Thu, Oct 2, 2008 at 5:56 AM, Griesbach, Lutz
<lutz.griesbach at coremedia.com> wrote:
> Ok, i only tried "upgrade" once manually to get another box from centos4.4 to a 4.5 ( and I ran into this http://bugs.centos.org/view.php?id=2557 ) and thought, the difference between update and upgrade is like the debian based "apt-get upgrade" and "apt-get dist-upgrade".
>
> The man page states this as well, vandaman is right, I should have RTFM, but I was a bit in a hurry
> and I thought, I could get some quick help here.
>
> No. And it wouldn't help you. There is no such thing as an "upgrade" in
> reality. An "upgrade" to 4.7 is just an update to the bunch of rpms that
> is considered to be "4.7". e.g. *any* update of dhcrelay might create the
> problem you saw.

Regarding "update" versus "upgrade", I'd like to give reference to
this forum thread:

http://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&topic_id=16315&forum=27

It boils down to Seth Vidal's own words,

"upgrade/update do the same thing unless you've gone out of your way
to disable obsoletes in your yum.conf"

and who else can say more about yum than Mr. Vidal?  :-D

Akemi