Maybe I need a little clarification of what Live Upgrade does. I've
gotten a lot of response of what I would call installer utilities but
not a Live Upgrade (if I'm wrong please point it out to me). What Live
Upgrade does under solaris is it creates a complete alternate boot
environment with a root /usr /var and any other filesystem you want.
Then you can apply patches etc to this other boot environment and boot
off of that. If there is something in the patch that doesn't work or
screws up the machine, then you just reboot off the original boot
environment and you're back to where you were before upgrading and still
have access to the patched boot environment to fix it. Its great for
upgrading production type servers because the 'back out plan' if you
will is nothing more than reboot off the old boot environment. In other
words you have 2 / filesystems, 2 /usr's, 2 /var's as well as 2
kernels. Its a complete boot environment copy that you can do anything
to and then just reboot off the new environment without having to touch
the 'live' environment.
For those that were asking, I'm running RedHat Advanced Server. I
appreciate the responses.
Thanks,
Kelly
Kelly Sauke wrote:
Does anyone know of any software for linux that acts similar to "Live
Upgrade" in Solaris or "Alternate Release Areas" in DG/UX?
I would find it very useful for upgrading and patching as well as
security audits to the applied OS "patches".
Thanks,
KS
