Change the MTU of a Data Interface Using the CLIΒΆ

You can change the MTU value for a data interface from the OpenStack Horizon Web interface or the CLI.

About this task

The MTU must be changed while the worker host is locked.

You can use CLI commands to lock and unlock hosts, and to modify the MTU on the hosts.

~(keystone_admin)]$ system host-lock <nodeName>
~(keystone_admin)]$ system host-if-modify <nodeName> <interface name> --imtu <mtu_size>
~(keystone_admin)]$ system host-unlock <nodeName>

where:

<nodename>

is the name of the host

<interface name>

is the name of the interface

<mtu_size>

is the new MTU value

For example:

~(keystone_admin)]$ system host-if-modify worker-0 enp0s8 --imtu 1496

Note

You cannot set the MTU on an openstack-compute-labeled worker node interface to a value smaller than the largest MTU used on its data networks.