Just to add a bit to Ryan's answer...

raman singh <[EMAIL PROTECTED]> writes:

> 1. I have to install Linux (Redhat) on some systems and MS OS (all
> win 98 - Win2k3) on some. I know before hand which system should
> have what OS.

Good luck with Windows 98.

For RedHat, you can use their "kickstart" mechanism.

> 2. DO I have any control on pushing an OS on a particular systems?
> Say, it was running RH9, now I want Win2k, can I do that?

Both Unattended and RedHat use PXELINUX to boot.  PXELINUX looks for a
configuration file with a name derived from the machine's MAC address.
It falls back to a default configuration file.  You can use this to
cause different machines to boot different images.

See pxelinux.doc in the SYSLINUX distribution
(http://syslinux.zytor.com/).

However, I think most people use a single default file and manually
choose which installer to boot (see below).

> 3. Can I control somehow, that when the system reboot, it does not
> do a reinstall?

It depends on what you are doing.

As Ryan said, normally you have a technician sitting at the machine
telling it to boot from the network and begin the installation.  The
PXELINUX configuration shipped with Unattended defaults to booting
from the hard disk after 30 seconds.

However, some machines have a feature called "Wake-On-LAN" (WoL),
which lets you power on the machine remotely.  Such machines can often
be configured to boot from the network when started by a WoL packet,
but boot from the hard drive otherwise.  In such an environment, you
could change the PXELINUX default to run your OS installation, and use
different configuration files for the different systems.

You would have to figure out the whole WoL mechanism.  (I am being a
little vague because I do not know very much about it.)

I suggest you start by ignoring WoL and just getting Unattended
working from a PXE boot so you can get a feel for the process.

 - Pat


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