02-01-2016
Do you mean upgrading from RHEL 6.3 to 6.5 (or better, to latest)?
I'm going to guess that OL is Oracle Linux... correct?
Of course Oracle Linux is different from Red Hat, though they try to maintain compatibility. I wouldn't think it's a problem to upgrade. Generally speaking (especially if there is no support) you should try to upgrade to the latest on version 6 (does look like 6.5 is the latest for Oracle Linux).
If you have doubts about what it might do, again, relatively safe, you might want to check with Oracle support. Generallly speaking (Red Hat, CentOS) updates on the major branch are pretty safe and you can control upgrades to the kernel and bouncing of services... this is "normal" and does not require a "building up from scratch" in fact keeping your 6.x RHEL/CentOS (and presumably Oracle Linux) based system up to date is the best way to get all the security fixes for the system.
I'll keep quiet on this and see if an Oracle Linux user can confirm...
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LEARN ABOUT DEBIAN
unattended-upgrade
unattended-upgrade(8) System Manager's Manual unattended-upgrade(8)
NAME
unattended-upgrade - automatic installation of security (and other) upgrades
SYNOPSIS
unattended-upgrade [options]
DESCRIPTION
This program can download and install security upgrades automatically and unattended, taking care to only install packages from the config-
ured APT source, and checking for dpkg prompts about configuration file changes. All output is logged to /var/log/unattended-upgrades.log.
This script is the backend for the APT::Periodic::Unattended-Upgrade option and designed to be run from cron (e.g. via
/etc/cron.daily/apt).
OPTIONS
unattended-upgrade accepts the following options:
-h, --help
help output
-d, --debug
extra debug output into /var/log/unattended-upgrades.log
--dry-run
Just simulate installing updates, do not actually do it
CONFIGURATION
The configuration is done via the apt configuration mechanism. The default configuration file can be found at /etc/apt/apt.conf.d/50unat-
tended-upgrades
AUTHORS
unattended-upgrade is written by Michael Vogt <mvo@ubuntu.com>
This manual page was originally written by Michael Vogt <mvo@ubuntu.com>
COPYRIGHT
Copyright (C) 2005-2009 Canonical
There is NO warranty. You may redistribute this software under the terms of the GNU General Public License. For more information about
these matters, see the files named COPYING.
May 4, 2009 unattended-upgrade(8)