Você precisa fazer um pouco mais do que usar hostname
. O link a seguir abaixo deve resolver seu problema. Altere seu nome de host sem reinicializar no RedHat Linux
Make sure you are logged in as root and move to /etc/sysconfig and open the network file in vi.
cd /etc/sysconfig vi network
Look for the HOSTNAME line and replace it with the new hostname you want to use. In this example I want to replace localhost with redhat9.
HOSTNAME=redhat9
When you are done, save your changes and exit vi. Next we will edit the /etc/hosts file and set the new hostname.
vi /etc/hosts
In hosts, edit the line that has the old hostname and replace it with your new one.
192.168.1.110 redhat9
Save your changes and exit vi. The changes to /etc/hosts and /etc/sysconfig/network are necessary to make your changes persistent (in the event of an unscheduled reboot).
Now we use the hostname program to change the hostname that is currently set.
hostname redhat9
And run it again without any parameters to see if the hostname changed.
hostname
Finally we will restart the network to apply the changes we made to /etc/hosts and /etc/sysconfig/network.
service network restart