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docs/doc/source/datanet/changing-the-mtu-of-a-data-interface-using-the-cli.rst
Ron Stone 11ded0cf7e Data Networks guide 
Applied M. Camp's comments on patchset 4.
Also, some additional formatting changes such as tidying line ends <= 79
characters, reformatting very wide ascii table as list table to control
line widths, etc.

Resolved conflict in _includes/data-networks-overview.rest

Change-Id: I8a2a80f21d3630849900e85dc2495da1668648af
Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Signed-off-by: Stone <ronald.stone@windriver.com>
2020-11-23 09:17:34 -05:00

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Change the MTU of a Data Interface Using the CLI

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

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.