Changing hostname

yusufs · 10-16-2008, 05:10 AM

Hai all,

We are using RHEL ES 4.0 Update 6

We have a network of 35 Linux servers, (with no domain installation)..Currently there is a requirement that one server name has to be changed as follows :

linux.nodomain.com to apps.domain.com..

Where do I have to change this ?.. How can I make sure that there are no traces of the old hostname remains in the server..Do I have to reboot the server ?

Please advise

Yusuf

bhajan.verma · 10-16-2008, 05:31 AM

you can change hostname in file /etc/sysconfig/network also in /etc/hosts

then reboot the system.

angel115 · 10-16-2008, 05:32 AM

Hi yusufs

If you edit the /etc/hosts file should be enough

Angel.

yusufs · 10-16-2008, 05:47 AM

Quote:

Originally Posted by angel115

Hi yusufs

If you edit the /etc/hosts file should be enough

Angel.

Thanks Friends,

Will do and let you know if there is any problem

Yusuf

billymayday · 10-16-2008, 06:08 AM

You will need to change /etc/sysconfig/network in redhat. Don't forget to restart the network services once changed

farslayer · 10-16-2008, 08:26 AM

I usually run through this guide to make sure everything is set properly and returns the correct hostname.

http://www.cpqlinux.com/hostname.html

angel115 · 10-16-2008, 08:33 AM

Hi billymayday,

I've just done the test on Readhat 4
After editing the file /etc/sysconfig/network, and restarting the network service doesn't seems to be enough.

After a reboot the changes are done but it should be an other way to apply the change without restarting.

Here is what I've tried and doesn't work:

Code:

service network restart
service network reload
Ifconfig eth0 down && Ifconfig eth0 up
xinetd restart

The above have no effect and the hostname stay unchanged.

billymayday · 10-16-2008, 03:22 PM

I use 5, so may be different.

Do you havea utility called "system-config-network" installed?

farslayer · 10-16-2008, 11:21 PM

I believe this section of the link I posted previously would have made the switch without the reboot..

Quote:

Checking /proc/sys/kernel/hostname
This is checked with the following command:

cat /proc/sys/kernel/hostname

If you need to set this file, you can either reboot or set it now with the following command:

echo mybox.mydomain.com > /proc/sys/kernel/hostname

shouldn't skip over them provided links

billymayday · 10-17-2008, 12:27 AM

Actually using the hostname command would probably achieve the same.

bhajan.verma · 10-17-2008, 01:56 AM

to chnage host name without reboot u can use echo "hostname" > /proc/sys/kernel/hostname.

hostname command only work for current open shell.