The 'E' in CentOS stands for Enterprise. Enterprises use change
control. Servers do not update themselves whenever they see an update.
Updates are tested (not so much), approved and scheduled, hopefully in
line with a maintenance window. In most enterprises that I've been in,
a server can't even contact the default repo servers. And remember that
for a RHEL server, it has to be registered with RHN before it can
officially receive updates. Defaulting yum-updatesd to on will be a no-op
in almost every 'enterprise' case.
Enterprises also don't hang servers directly off the Internet. There
are many layers betwixt the wild web and the OS.
In the decade plus that I've been running RHEL, I've seen 1 update that
was worthy of an emergency change to push it out RIGHT NOW to the
servers. And even that one didn't really need to be done.
----------------------------------------------------------------------
Jim Wildman, CISSP, RHCE jim@xxxxxxxxxxxxx http://www.rossberry.net
"Society in every state is a blessing, but Government, even in its best
state, is a necessary evil; in its worst state, an intolerable one."
Thomas Paine
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