OS update on redhat

[m.roth at 5-cent.us]

Mouli wrote:
>
> I have a question about redhat OS update. Normally we are using OS
> update via yum. If we need to restore previous environment, what can we
> do?
>
> In AIX we have mksysb and Solaris lucreate (alternate boot environment)
> Similar like anything is there on redhat?

What do you want to do - roll back an update (yum downgrade) or just boot
to a previous kernel, which is what an upgrade usually sets up to allow
you to do in grub?

        mark