Change Hostname in Red Hat

There are 2 ways of changing the Red Hat operating system hostname. You can do the changes for temporary or permanently.

Temporary Hostname:

1. Check your hostname.

# hostname oldhostname

2. Change the hostname.

# hostname newhostname

3. Verify

# hostname newhostname

Note:
The old hostname will revert back after you reboot the system.

Permanent Hostname:

1. Check your hostname.

# cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=oldhostname

2. Edit the /etc/sysconfig/network file & save!

# vi /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=newhostname

3. Next, edit the /etc/hosts file & save!

# more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       localhost.localdomain localhost
10.0.0.10       newhostname

# vi /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       localhost.localdomain localhost
10.0.0.10       newhostname

4. Restart network services.