Hi Team, we are trying to upgrade *Triple0 Train to Ussuri.* Undercloud upgrade is done successfully. *OverCloud Upgrade:* As a first step in overcloud upgrade, we are running " *openstack overcloud upgrade prepare* " command. which is throwing following error: * len(inspect.getargspec(type_).args) > 1)2022-02-23 16:49:50.959 187217 INFO tripleoclient.utils.utils [-] Running Ansible playbook: /usr/share/ansible/tripleo-playbooks/cli-update-params.yaml, Working directory: /tmp/tripleoj7rvp51m, Playbook directory: /usr/share/ansible/tripleo-playbooksPLAY [Update Parameters] *******************************************************2022-02-23 16:49:51.858966 | 5254007d-0040-f631-88e7-000000000008 | TASK | Check for required inputs2022-02-23 16:49:51.895961 | 5254007d-0040-f631-88e7-000000000008 | SKIPPED | Check for required inputs | localhost2022-02-23 16:49:51.897803 | 5254007d-0040-f631-88e7-000000000008 | TIMING | Check for required inputs | localhost | 0:00:00.096595 | 0.04s2022-02-23 16:49:51.901827 | 5254007d-0040-f631-88e7-000000000009 | TASK | Set parameters fact2022-02-23 16:49:51.949091 | 5254007d-0040-f631-88e7-000000000009 | OK | Set parameters fact | localhost2022-02-23 16:49:51.951583 | 5254007d-0040-f631-88e7-000000000009 | TIMING | Set parameters fact | localhost | 0:00:00.150375 | 0.05s2022-02-23 16:49:51.956146 | 5254007d-0040-f631-88e7-00000000000b | TASK | Update parameters2022-02-23 16:50:12.542028 | 5254007d-0040-f631-88e7-00000000000b | FATAL | Update parameters | localhost | error={"changed": false, "error": "Error validating environment for plan overcloud: ERROR: Property error: resources.InternalApiVirtualIP.properties: Unknown Property DnsName\n File \"/usr/lib/python3.6/site-packages/heat/common/wsgi.py\", line 891, in __call__\n request, **action_args)\n File \"/usr/lib/python3.6/site-packages/heat/common/wsgi.py\", line 964, in dispatch\n return method(*args, **kwargs)\n File \"/usr/lib/python3.6/site-packages/heat/api/openstack/v1/util.py\", line 56, in handle_stack_method\n return handler(controller, req, **kwargs)\n File \"/usr/lib/python3.6/site-packages/heat/api/openstack/v1/stacks.py\", line 633, in validate_template\n raise exc.HTTPBadRequest(result['Error'])\n", "msg": "Error updating parameters for plan overcloud: Error validating environment for plan overcloud: ERROR: Property error: resources.InternalApiVirtualIP.properties: Unknown Property DnsName\n File \"/usr/lib/python3.6/site-packages/heat/common/wsgi.py\", line 891, in __call__\n request, **action_args)\n File \"/usr/lib/python3.6/site-packages/heat/common/wsgi.py\", line 964, in dispatch\n return method(*args, **kwargs)\n File \"/usr/lib/python3.6/site-packages/heat/api/openstack/v1/util.py\", line 56, in handle_stack_method\n return handler(controller, req, **kwargs)\n File \"/usr/lib/python3.6/site-packages/heat/api/openstack/v1/stacks.py\", line 633, in validate_template\n raise exc.HTTPBadRequest(result['Error'])\n", "success": false}2022-02-23 16:50:12.544560 | 5254007d-0040-f631-88e7-00000000000b | TIMING | Update parameters | localhost | 0:00:20.743350 | 20.59s* *Command used to run the overcloud upgrade prepare:* *(undercloud) [stack@undercloud ~]$ cat upgrade_overcloud_prepare.shopenstack overcloud upgrade prepare --templates \ -r /home/stack/templates/roles_data.yaml \ -n /home/stack/templates/network_data.yaml \ -e /home/stack/templates/environment.yaml \ -e /home/stack/templates/environments/network-isolation.yaml \ -e /home/stack/templates/environments/network-environment.yaml \ -e /usr/share/openstack-tripleo-heat-templates/environments/services/ironic-conductor.yaml \ -e /usr/share/openstack-tripleo-heat-templates/environments/services/ironic-inspector.yaml \ -e /usr/share/openstack-tripleo-heat-templates/environments/services/ironic-overcloud.yaml \ -e /home/stack/templates/ironic-config.yaml \ -e /usr/share/openstack-tripleo-heat-templates/environments/docker-ha.yaml \ -e /usr/share/openstack-tripleo-heat-templates/environments/podman.yaml \ -e /home/stack/templates/init-repo.yaml \ -e /home/stack/containers-prepare-parameter.yaml(undercloud) [stack@undercloud ~]$* *Document referred:*Upgrading to a Next Major Release — TripleO 3.0.0 documentation (openstack.org) <https://docs.openstack.org/project-deploy-guide/tripleo-docs/wallaby/post_deployment/upgrade/major_upgrade.html> Any support here, please. Please suggest if any other documents needs to be followed for ugrade. -- ~ Lokendra skype: lokendrarathour