Description of problem:

For an update between osp-d 7.2 and 7.3, I missed to add overcloud-resource-registry-puppet.yaml file in my update line.

Update failed with error:
resources.Networks: resources.StorageNetwork: Conflict: resources.StorageSubnet: Unable to complete operation on subnet faa5d940-00d9-47a4-b6f1-31346dcced3b. One or more ports have an IP allocation from this subnet.

It's also failed with others networks (InternalApi, External, etc)

When I added this file and re-launched my update, Heat try to continue to create subnets. 
It was too late...

I had to delete the stack, recreate it and upgrade it !

If I'm correct, without this file, Heat try to (re)create the stack (with networks, subnets, etc).

Version-Release number of selected component (if applicable):
openstack-neutron-common-2015.1.2-9.el7ost.noarch
openstack-tripleo-0.0.7-0.1.1664e566.el7ost.noarch
openstack-neutron-2015.1.2-9.el7ost.noarch
openstack-swift-account-2.3.0-4.el7ost.noarch
openstack-nova-cert-2015.1.2-18.el7ost.noarch
openstack-tuskar-ui-0.4.0-5.el7ost.noarch
openstack-ironic-common-2015.1.2-2.el7ost.noarch
openstack-dashboard-2015.1.2-4.el7ost.noarch
openstack-utils-2014.2-1.el7ost.noarch
openstack-tripleo-common-0.0.1.dev6-6.git49b57eb.el7ost.noarch
openstack-nova-console-2015.1.2-18.el7ost.noarch
openstack-heat-api-cloudwatch-2015.1.2-9.el7ost.noarch
openstack-ironic-discoverd-1.1.0-8.el7ost.noarch
openstack-tempest-kilo-20151020.1.el7ost.noarch
openstack-ceilometer-alarm-2015.1.2-1.el7ost.noarch
openstack-ironic-conductor-2015.1.2-2.el7ost.noarch
openstack-swift-2.3.0-4.el7ost.noarch
openstack-tripleo-heat-templates-0.8.6-121.el7ost.noarch
openstack-tripleo-image-elements-0.9.6-10.el7ost.noarch
openstack-nova-novncproxy-2015.1.2-18.el7ost.noarch
openstack-keystone-2015.1.2-2.el7ost.noarch
openstack-heat-templates-0-0.8.20150605git.el7ost.noarch
openstack-tuskar-ui-extras-0.0.4-2.el7ost.noarch
openstack-ceilometer-notification-2015.1.2-1.el7ost.noarch
openstack-glance-2015.1.2-1.el7ost.noarch
openstack-ceilometer-collector-2015.1.2-1.el7ost.noarch
openstack-neutron-ml2-2015.1.2-9.el7ost.noarch
openstack-swift-proxy-2.3.0-4.el7ost.noarch
openstack-nova-api-2015.1.2-18.el7ost.noarch
openstack-heat-api-cfn-2015.1.2-9.el7ost.noarch
openstack-heat-api-2015.1.2-9.el7ost.noarch
openstack-puppet-modules-2015.1.8-51.el7ost.noarch
openstack-swift-plugin-swift3-1.7-3.el7ost.noarch
openstack-tripleo-puppet-elements-0.0.1-5.el7ost.noarch
openstack-nova-conductor-2015.1.2-18.el7ost.noarch
openstack-tuskar-0.4.18-5.el7ost.noarch
openstack-ceilometer-common-2015.1.2-1.el7ost.noarch
openstack-ceilometer-api-2015.1.2-1.el7ost.noarch
openstack-ironic-api-2015.1.2-2.el7ost.noarch
openstack-neutron-openvswitch-2015.1.2-9.el7ost.noarch
openstack-swift-container-2.3.0-4.el7ost.noarch
openstack-nova-scheduler-2015.1.2-18.el7ost.noarch
openstack-dashboard-theme-2015.1.2-4.el7ost.noarch
openstack-selinux-0.6.46-1.el7ost.noarch
openstack-nova-common-2015.1.2-18.el7ost.noarch
openstack-nova-compute-2015.1.2-18.el7ost.noarch
openstack-swift-object-2.3.0-4.el7ost.noarch
openstack-heat-engine-2015.1.2-9.el7ost.noarch
openstack-ceilometer-central-2015.1.2-1.el7ost.noarch
openstack-heat-common-2015.1.2-9.el7ost.noarch

How reproducible:

Deploy a 7.2 OSP ans upgrade it without overcloud-resource-registry-puppet.yaml file.

Steps to Reproduce:
1. Deploy OSP in 7.2
2. Upgrade it to 7.3 without overcloud-resource-registry-puppet.yaml file.

Actual results:

Heat update failed because Heat try to recreate subnets.

Expected results:

It should be good to add overcloud-resource-registry-puppet.yaml file by default for the 'openstack overcloud update stack overcloud' command.

And/Or explain that is mandatory to have this file to succeed an upgrade.


Additional info: