RHEL: Change system’s hostname

# RHEL 5 & 6 -------------------------------------------------------------------------------

# Change hostname in /etc/sysconfig/network file

# and run following command:

hostname <new_hostname>

# Do not forget to update /etc/hosts if necessary



# RHEL 7 -----------------------------------------------------------------------------------

# Run following command:

hostnamectl set-hostname <new_hostname>

# OR change hostname in /etc/hostname, for permanent change, and run following command:

hostname <new_hostname>

# Do not forget to update /etc/hosts if necessary