Host-name DHCP Option Ignored on Cumulus Linux


If a Cumulus Linux switch running 5.9.0 or later with NVUE enabled receives a DHCP lease containing the host-name option, it ignores the received hostname and does not apply it.


  • Cumulus Linux 5.9.0 and later.
  • Active DHCP lease containing the host-name option cached in /var/lib/dhcp/dhclient.eth0.leases, and, or a DHCP server offering a lease containing the host-name option.
  • You use NVUE to manage the switch or the {{nvued}} and {{nvue-startup}} services are enabled.

Cause and Resolution

Cumulus Linux 5.9.0 and later ignores the DHCP host-name option because NVUE manages the hostname in the /etc/nvue.d/startup.yaml file and prevents DHCP from overwriting it. If you do not manage your switch with NVUE, you can enable the DHCP hostname as follows:

  1. Disable and stop the nvued and nvue-startup services:
cumulus@switch:~$ sudo systemctl stop nvued.service
cumulus@switch:~$ sudo systemctl stop nvue-startup.service
cumulus@switch:~$ sudo systemctl disable nvued.service
cumulus@switch:~$ sudo systemctl disable nvue-startup.service
  1. Edit the /etc/dhcp/dhclient-exit-hooks.d/dhcp-sethostname file and change the SETHOSTNAME variable to yes:
cumulus@switch:~$ sudo nano /etc/dhcp/dhclient-exit-hooks.d/dhcp-sethostname 
if [ $SETHOSTNAME = "yes" ] && [ ! -z $new_host_name ]
    hostname $new_host_name
    sed --in-place -e "/127\.0\.1\.1/s/^.*$/  $new_host_name/" /etc/hosts
  1. Reboot the switch with the sudo reboot command or renew the DHCP lease on the interface by bringing it down and up again:
cumulus@switch:~$ sudo ifdown eth0; sudo ifup eth0