Re: Live Upgrade for Linux

From: Reece Dike (sflinux@erd.erd3.com)
Date: 03/28/03

  • Next message: Axel Beckert - ecos gmbh: "Re: Live Upgrade for Linux" 
    Date: Fri, 28 Mar 2003 16:12:04 -0600 (CST)
From: Reece Dike <sflinux@erd.erd3.com>
To: focus-linux@securityfocus.com

    On Wed, 26 Mar 2003, Eric Rostetter wrote:

    >
    > This isn't the same as Live Upgrade. 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). In other words, there are no vendor install/upgrade
    > utilities that I know of for linux that run on a running system.
    >
    > I agree you can do updates (install security patches, etc) this way.
    > But not a full install or major OS upgrade, AFAIK.
    >

    The RedHat installer, anaconda IIRC, does this. During an install you can
    can use the Alt-F2 to get to a command line prompt. From there you can
    poke around and see what is going on. The partitions that you are
    installing to are mounted under /mnt/sysimage. Anaconda just uses 'rpm
    --root /mnt/sysimage' when it processes the rpms. You should be able to
    use the kickstart file that was produced when you did the original redhat
    install to recreate your environment.

    So, in short, I believe all the necessary tools are avaliable to build a
    'live update' system, but, no one has done it yet.

    Reece 'How do I create a new project on sourceforge?' Dike

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