...

1. Run puppet with the ussuri modules/tags
2. Run apt dist-upgrade
3. Rerun puppet and restart the service
   1. systemctl restart ovsdb-server
   2. systemctl restart neutron-dhcp-agent.service neutron-l3-agent.service neutron-metadata-agent.service neutron-openvswitch-agent.service neutron-ovs-cleanup.service

Placement

1. Run puppet with ussuri modules/tags
2. Run apt-get purge placement-api placement-common python3-placement && apt-get autoremove && apt-get dist-upgrade
3. Run puppet again
4. Run placement-manage db online_data_migrations

Nova

To upgrade nova without any downtime, follow this procedure

Preperations

Before the upgrades can be started it is important that all data from previous nova-releases are migrated to stein's release. This is done like so:

• Run nova-manage db online_data_migrations on an API node. Ensure that it reports that nothing more needs to be done.
  • Make sure there is no errors. Particulary anything related to "virtual interface table". See https://bugs.launchpad.net/nova/+bug/182443

Nova API

1. In the node-specific hiera, disable the services at the first node you would like to upgrade with the keys

   1. apache::service_ensure: 'stopped'

2. Run puppet with the ussuri modules/tags
3. Run apt dist-upgrade && apt-get autoremove

4. Run nova-manage api_db sync
5. Run nova-manage db sync
6. Re-enable placement API on the upgraded node:
   
   1. Remove apache::service_ensure: 'stopped' from the upgraded node's hiera file
7. Upgrade the rest of the nodes (basically run step 1-3, re-run puppet and restart nova-api and apache2)

Nova-services

1. Run puppet with the ussuri modules/tags
2. Run apt dist-upgrade && apt-get autoremove
3. Run puppet and restart services