The Parameter (ExternalMtu) was not provided

[Harald Jensås]

-e /home/centos/tripleo-heat-templates/environments/net-multiple-nics.yaml

[overcloud.Compute.0.NetworkConfig]: CREATE_FAILED resources.NetworkConfig: Property error: resources.OsNetConfigImpl.properties.config: The Parameter (ExternalMtu) was not provided.
[overcloud.Compute.0]: CREATE_FAILED Resource CREATE failed: resources.NetworkConfig: Property error: resources.OsNetConfigImpl.properties.config: The Parameter (ExternalMtu) was not provided.
[overcloud.Compute.0]: CREATE_FAILED resources.NetworkConfig: resources[0].Property error: resources.OsNetConfigImpl.properties.config: The Parameter (ExternalMtu) was not provided.
[overcloud.Compute]: UPDATE_FAILED Resource CREATE failed: resources.NetworkConfig: resources[0].Property error: resources.OsNetConfigImpl.properties.config: The Parameter (ExternalMtu) was not provided.
[overcloud.Compute]: CREATE_FAILED resources.Compute: Resource CREATE failed: resources.NetworkConfig: resources[0].Property error: resources.OsNetConfigImpl.properties.config: The Parameter (ExternalMtu) was not provided.
[overcloud]: CREATE_FAILED Resource CREATE failed: resources.Compute: Resource CREATE failed: resources.NetworkConfig: resources[0].Property error: resources.OsNetConfigImpl.properties.config: The Parameter (ExternalMtu) was not provided.

This happens because of the way external bridge required by OVN and DVR is implemented in: https://opendev.org/openstack/tripleo-heat-templates/commit/ff7cce93ebcdf4fd868329be94d618f9e755049f

{#- We need bridge also for ComputeDVR and Computes with OVN #}
{%- elif network.name in role.networks or 'external_bridge' in role.tags %}
              - type: ovs_bridge
{%- if network.name == "External" %}
                name: bridge_name
{%- else %}
                name: br-{{network.name_lower}}
{%- endif %}
                mtu:
                  get_param: {{network.name}}Mtu
                dns_servers:
                  get_param: DnsServers
                use_dhcp: false

This does not work very well:
1. the {{network.name}}Mtu parameter for the External network is not created.
   Since it is filtered as not used by the role here: https://opendev.org/openstack/tripleo-heat-templates/src/branch/master/network/config/multiple-nics/role.role.j2.yaml#L45
2. The value for {{network.name}}Mtu should be passed from the property of
   the neutron ports network here: https://opendev.org/openstack/tripleo-heat-templates/src/branch/master/puppet/role.role.j2.yaml#L453

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/687437

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/687437
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=cf06b61d670b301c57fce70e19aa17ac7561b037
Submitter: Zuul
Branch: master

commit cf06b61d670b301c57fce70e19aa17ac7561b037
Author: Harald Jensås <email address hidden>
Date: Wed Oct 9 01:03:03 2019 +0200

    Fix multiple-nics network config ExternalMtu

    The external network is used for the external bridge
    in OVN and DVR usecase. Controlled by external_bridge
    tag in the role.

    For this to work we also need to include the ExternalMtu
    parameter when external_bridge tag is present.

    Closes-Bug: #1847360
    Change-Id: I93d5bfb540d298765ebc35d7596b214271f07dca

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 11.3.0 release.