From: Mike N. 

On Fri, 9 Feb 2007 23:47:44 -0500, "Geo."  wrote:

>Ok next dumb question, is there no way to uninstall a patch on linux?

  In this case, the problem was the kernel.  The standard yum upgrade for a
kernel allows you to select an older kernel version at boot time.

   Apparently there's no such thing as patch rollback on Linux.  You have
to look at the yum log, fetch the previous version and overwrite the
update; all the while wondering whether there were any applicable .CONF
file updates.  (Which there were for this one in the X11 tree - it was
futzelling with the mouse settings).

   The confusing thing on this one was that the mouse driver was updated at
the same yum update session, so I was looking at getting the source code to
the mouse driver.

   Bottom line for me: the yum update procedure is now : Full image backup,
yum update, test.    Not workable for a production server.

   So for mission critical, it's more something like openBSD with older but
more secure technology.    I can't yet say that something like CentOS is
secure to stand on its own without having major vulnerabilities hanging out
there months before a upgrade - test - deploy cycle can be completed.

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