hostname - set or print name of current host system
The hostname utility prints the name of the current host. The super-user (root) can set the hostname by supplying an argument. For FreeBSD, if you wish to make changes permanent, you'd need also need to edit /etc/rc.conf
For Linux, it will depend on the distro you're using. Latest versions of Ubuntu, CentOS, Debian, Fedora, and so on, will come with systemd, a system and service manager that provides a hostnamectl command to manage hostnames in Linux.
If you're root already, you can change your hostname by typing:
$ hostnamectl set-hostname MY_NEW_HOSTNAME
Otherwise, </code>$ hostnamectl set-hostname MY_NEW_HOSTNAME</code>
For older Linux edit the hostname file, /etc/hostmame
Once this is done, add another record for the hostname in /etc/hosts
After this, you'd need to execute the following command: /etc/init.d/hostname restart
If you're using CentOS-based system that use init, the hostname is changed by modifying, /etc/sysconfig/network file
Here's the snippet from that file:
$ cat /etc/sysconfig/network NETWORKING=yes HOSTNAME="host1-legacy-linux-node" GATEWAYDEV=ens160 GATEWAY=192.168.10.1 FORWARD_IPV4="yes"
To make changes permament, change the value next to “HOSTNAME” to the one of your desired hostname.