Re: Live Upgrade for Linux

From: Axel Beckert - ecos gmbh (beckert@ecos.de)
Date: 03/28/03

  • Next message: Andy Wild: "Red Hat: To patch or to upgrade?" 
    Date: Fri, 28 Mar 2003 10:54:44 +0100
From: Axel Beckert - ecos gmbh <beckert@ecos.de>
To: focus-linux@securityfocus.com

    Hi!

    Am Wed, Mar 26, 2003 at 05:14:53PM -0600, Eric Rostetter schrieb:
    > With Live Upgrade, I can install a fresh OS while the machine is
    > running, or upgrade (e.g. From Solaris 8 to Solaris 9) while the
    > system is running. In the linux world, at least the versions I've
    > used, you can't do this (Install RedHat 8.0 on the machine while it
    > is up and running RedHat 7.3, or upgrade 7.3 to 8.0 while running).

    At least this is working with Debian. Except that you can't easily
    switch back, because the system and applications are update on the
    running system. (So that's the backside...)

    You can do a full upgrade from 2.2 to 3.0 even without rebooting. You
    just need to reboot for new kernel packages. Although taking more than
    one step at once (e.g. from 2.0 or 2.1 to 3.0) has been reported not
    to work as well as from 2.2 to 3.0.

    You probably have to change your source.list, but apt-get upgrade
    will fetch and install you the new OS version.

    > I agree you can do updates (install security patches, etc) this way.
    > But not a full install or major OS upgrade, AFAIK.

    So that statement (without the "AFAIK" :-) is wrong, but of course
    Debian's apt-get upgrade is not as functional as Live Upgrade,
    especially that you neither can't install to second environement nor
    you can't switch back easily if at all.

                Kind regards, Axel Beckert 

    -- 
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