Friday, 30 December 2016

Red Hat Enterprise Linux 7.3 - Setting the Hostname

In the past, I've always used the hostname command to set … the hostname of a Red Hat Enterprise Linux 6.X box, and edited /etc/sysconfig/network but things they've a-changed ….

In RHEL 7.3, we now use the systemd-hostnamed command.

From this: -


</snip>
 NetworkManager now controls the host name using systemd-hostnamed

With this update, NetworkManager uses the systemd-hostnamed service to read and write the static host name, which is stored in the /etc/hostname file. Due to this change, manual modifications done to the /etc/hostname file are no longer picked up automatically by NetworkManager; users should change the system host name through the hostnamectl utility. Also, the use of the HOSTNAME variable in the /etc/sysconfig/network file is now deprecated. (BZ#1367916)
</snip>

Check the current hostname

hostnamectl 

   Static hostname: rhel72.uk.ibm.com
Transient hostname: bpm857.uk.ibm.com

         Icon name: computer-vm
           Chassis: vm
        Machine ID: 6bbac592627f45f5b36fcba08aa95fb3
           Boot ID: 6ca7b1f7d3ff4235940bb8765daf0adb
    Virtualization: vmware
  Operating System: Red Hat Enterprise Linux Server 7.3 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.3:GA:server
            Kernel: Linux 3.10.0-514.2.2.el7.x86_64
      Architecture: x86-64


Set the new hostname

hostnamectl set-hostname bpm857.uk.ibm.com

Reboot

reboot

Check the current hostname

hostnamectl 

   Static hostname: bpm857.uk.ibm.com
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 6bbac592627f45f5b36fcba08aa95fb3
           Boot ID: 9c1fe5e5fc324be48a5e52217ffd2496
    Virtualization: vmware
  Operating System: Red Hat Enterprise Linux Server 7.3 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.3:GA:server
            Kernel: Linux 3.10.0-514.2.2.el7.x86_64
      Architecture: x86-64



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