How to Change Hostname on CentOS 7 / RHEL 7 Servers
This post describe about how to change Hostname in your CentOS 7 or RHEL 7 using commands. Before that we need to understanding hostname, its divided into three classes are static, pretty, and transient.
Static – The static host name is traditional host which can be chosen by the user and is stored in /etc/hostname file.
Transient – The transient host name is maintained by kernel and can be changed by DHCP and mDNS.
Pretty – It is a free form UTF -8 host name for the presentation to the user.
Another important is a Hostname can be support up to 64 characters in length, Recommend to have FQDN and character consist of a-z, A-Z, 0-9, “-”, “_” and “.” only,
To find out your hostname,
Static hostname: localhost.localdomain
Icon name: computer-vm
Machine ID: 1224e1b361a9b0e393afcf5d475c5638
Boot ID: 12347f4abc30a4ff4446yb9823495vv7m
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-123.20.1.el7.x86_64
Option 1 - Update Hostname:
Check the status:
To set permanently execute the below command and don't want to reboot your system.
Option 2 - Modify Directly :
Directly modify the hostname on /etc/hostname
Save that file and execute below command
Option 3 - Using nmcli:
Change Hostname Using nmcli:
To check your hostname,
Now, update hostname using nmcli,
Restart the hostnamed to force the hostnamectl,