Linux: How to change hostname

[root@localhost ~]# hostname

localhost.localdomain

[root@localhost ~]# hostname

localhost.localdomain

1. change name in /etc/hostname file.

[root@localhost ~]# cat /etc/hostname

localhost.localdomain

[root@localhost ~]# 

[root@localhost ~]# cat /etc/hostname

node1

[root@localhost ~]#

2. change name in /etc/hosts file.

[root@localhost ~]# cat /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

[root@localhost ~]#

[root@localhost ~]# cat /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.137.60  node1   node1

[root@localhost ~]#

[root@localhost ~]# hostname

node1

[root@localhost ~]#