Is it possible to configure the mtu of a network while creating it with a heat template in Openstack?
I can set the mtu through the CLI openstack network --mtu <value> <network_id>
I see a reference to mtu in the heat guide but it doesn't appear to allow setting of the value.
Yes, it is possible to set the MTU with heat-templates. You have to use the value_specs-field, which allows you additional properties. See its really bad documentation here:
I tested it with the following simple heat-template:
heat_template_version: 2013-05-23
description: tests network
resources:
demo-network:
type: OS::Neutron::Net
properties:
name: demo-network
value_specs: { mtu: 1400 }
It really created a network with an MTU of 1400 like set in the template. Checked it with a show-command:
root@test-node:~# openstack network show demo-network
+---------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+---------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2020-05-16T13:33:53Z |
| description | |
| dns_domain | None |
| id | 965d890f-0c37-400e-8ee0-ec6ce1fcf4e6 |
| ipv4_address_scope | None |
| ipv6_address_scope | None |
| is_default | None |
| is_vlan_transparent | None |
| location | cloud='', project.domain_id=, project.domain_name='Default', project.id='2dacaa8f6d3348f28e126b371bf1dfab', project.name='admin', region_name='RegionOne', zone= |
| mtu | 1400 |
| name | demo-network |
| port_security_enabled | True |
| project_id | 2dacaa8f6d3348f28e126b371bf1dfab |
| provider:network_type | vxlan |
| provider:physical_network | None |
| provider:segmentation_id | 60 |
| qos_policy_id | None |
| revision_number | 1 |
| router:external | Internal |
| segments | None |
| shared | False |
| status | ACTIVE |
| subnets | |
| tags | |
| updated_at | 2020-05-16T13:33:53Z |
+---------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+