How to modify the hostname in Linux

root's picture

Usually this is an easy task using the hostname command:

[root@blah ~]# hostname
blah
[root@blah ~]# hostname florian
[root@blah ~]# hostname
florian

But on some distributions, this procedure is not modifying the hostname permanently.

On Debian based systems you must:
1. edit /etc/hostname and put there whatever hostname you want to set;
2. run /etc/init.d/hostname.sh start

on RedHat based systems you have to:
1. edit /etc/sysconfig/network and put on HOSTNAME stanza whatever you want.
2. Reboot.

You can modify the hostname also via sysctl command:
to read: sysctl kernel.hostname
to modify: sysctl kernel.hostname=blah

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