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1. In the node-specific hiera, disable the services with the keys

   1. apache::service_ensure: 'stopped'

   2. nova::api::enabled: false

2. Run puppet with the rocky modules/tags
3. Run apt dist-upgrade
4. Run nova-manage api_db sync
5. Run nova-manage db sync
6. Re-enable placement API on the upgraded node and disable it on the other nodes. This is because the other services needs the placement API to be updated first
   
   1. Remove apache::service_ensure: 'stopped' from the upgraded node's hiera file
   2. Set it on all the other nodes and run puppet
7. Upgrade the rest of the nodes (basically run step 2 and 3, re-run puppet and restart nova-api and apache2)
8. Remove the hiera keys that disabled the services, and re-run puppet

On the service-nodes

1. Run puppet with the rocky modules/tags
2. Run apt dist-upgrade
3. Run puppet and restart services

Heat

The rolling upgrade procedure for heat includes a step where you are supposed to create a new rabbit vhost. I don't want that. Therefore, this is the cold upgrade steps.

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