...

1. Stop all magnum-services by adding the following keys to node-specific hiera, and then make sure to run puppet on the magnum hosts:

   1. magnum::conductor::enabled: false

   2. apache::service_ensure: 'stopped'

2. Run puppet with the zed modules/tags

3. Run apt dist-upgrade && apt autoremove

4. Run su -s /bin/sh -c "magnum-db-manage upgrade" magnum

5. Re-start magnum services by removing the keys added in step 1 and re-run puppet.

6. Check if a new Fedora CoreOS image is required, and if new public cluster templates should be deployed. I.e to support a newer k8s version
   1. The official documentation provides a nice bit of help with this.

Octavia

Octavia must be stopped for upgrades, and can thus be performed on all octavia-hosts at the same time. It might be an idea to keep one set of hosts stopped at old code in case of the need for a sudden roll-back.

1. Stop all octavia-services by adding the following keys to hiera, and then make sure to run puppet on the octavia hosts:

   1. octavia::housekeeping::enabled: false

   2. octavia::health_manager::enabled: false

   3. octavia::api::enabled: false

   4. octavia::worker::enabled: false

2. Do one of:

   1. Reinstall the node with zed modules/tags

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

3. Run octavia-db-manage upgrade head


4. Re-start octavia services by removing the keys added in step 1 and re-run puppet.

5. Build a zed-based octavia-image and upload to glance. Tag it and make octavia start to replace the amphora.

Horizon

Reinstall the horizon servers to Ubuntu 22.04 if not already done

1. Run puppet with the zed modules/tags
2. Add the following to the node-specific hiera file for horizon nodes:
   1. apache::mod::wsgi::package_name: 'libapache2-mod-wsgi-py3'
   2. apache::mod::wsgi::mod_path: '/usr/lib/apache2/modules/mod_wsgi.so'
3. run apt dist-upgrade && apt autoremove

4. Run puppet again
5. restart apache2

Compute-nodes and GPU-nodes

When all APIs etc. are upgraded, it is time to do the same on the compute-nodes. Compute nodes are simple to upgrade:

1. Do one of:
   1. Reinstall the node with zed modules/tags
   2. Run puppet with the zed modules/tags, Run apt dist-upgrade && apt-get autoremove
2. Reboot the compute-node
   1. When it comes up, see that the storage-interface is up. It it isnt, run a manual puppet-run to fix it.