Hostname and IP address during kickstart

[Ryan Golhar]

Hi Peter,

Yes, that's almost exactly what I have.  It looks like the machine name
is set to $HOSTNAME.  I'm retrieving the IP address from
/etc/sysconfig/network.  I came up with this.  I need to add the the
full name to the list.

Source /etc/sysconfig/network
IPADDR=`hostname $HOSTNAME | cut -f 4 -d ' '`
echo "127.0.0.1         localhost.localdomain   localhost" > /etc/hosts
echo "$IPADDR           $HOSTNAME.umdnj.edu     $HOSTNAME" >> /etc/hosts


-----
Ryan Golhar
Computational Biologist
The Informatics Institute at
The University of Medicine & Dentistry of NJ

Phone: 973-972-5034
Fax: 973-972-7412
Email: golharam at umdnj.edu

-----Original Message-----
From: Pete Nesbitt [mailto:pete at linux1.ca] 
Sent: Wednesday, July 14, 2004 10:54 PM
To: golharam at umdnj.edu; General Red Hat Linux discussion list
Subject: Re: Hostname and IP address during kickstart


On July 14, 2004 09:30 am, Ryan Golhar wrote:
> I have a bunch of machines that I kickstart.  They all use DHCP to 
> obtain their hostname and IP address.  The names are address are all 
> static (in dhcpd.conf).
>
> Currently, in /etc/hosts on these machines, their hostname is set to 
> 127.0.0.1 and this interferes with PVM.  I need to set their host name

> to their correct IP address in /etc/hosts.  What is the easiest way of

> doing this during %post in kickstart?
>
> Ryan


Hi Ryan,
Here is a little shell script that will overwrite the existing
/etc/hosts file 
with the new IP/hostname (as well as 127...). I have tested it in a
dummy 
file. It needs to be run as root.

If you have static entries, you need to add them into the script or you
will 
lose them.


#!/bin/bash
# this ONLY WORKS IF there are no other entries in hosts!!
# it will overwrite anything in the hosts file!

HOSTS="/etc/hosts"
TEMP_HOSTS="/tmp/hosts.tmp"
NIC="eth0"
IP="`ifconfig $NIC | grep inet | cut -d : -f 2 | cut -d \  -f 1`"
FULL_NAME="`uname -n`" SHORT_NAME="`uname -n|cut -d. -f1`"

echo "127.0.0.1 localhost.localdomain   localhost" > $TEMP_HOSTS
echo "$IP       $FULL_NAME      $SHORT_NAME" >> $TEMP_HOSTS
# add more static entries if needed like this:
#echo "xxx.xxx.xxx.xxx	somehost.domain.com	somehost" >> $TEMP_HOSTS

cat $TEMP_HOSTS > $HOSTS
#end

Hope that helps
-- 
Pete Nesbitt, rhce