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1. Select which glance-server to upgrade first.
   1. In the node-specific hiera for this host you should set: glance::api::enabled: false followed by a puppet-run. This would stop the glance-api service on the host.
2. Run puppet on the first host with the stein modules/tags
3. Run apt dist-upgrade && apt-get autoremove

4. Run glance-manage db expand
5. Run glance-manage db migrate
6. Remove the glance::api::enable: false from the node-specific hiera, and run puppet again. This would re-start the glance api-server on this host.
   1. Test that this api-server works.
7. Upgrade the rest of the glance hosts (ie; step 2 + 3 for each of the remaining glance hosts)

Cinder

To upgrade cinder without any downtime, follow this procedure

1. Add the following three lines to the node-file of the first node you would like to upgrade:

   1. apache::service_ensure: 'stopped'

   2. cinder::scheduler::enabled: false

   3. cinder::volume::enabled: false

2. Add the following two lines to the node-specific hiera-file for the node you are upgrading
   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 puppet on the first host with rocky modules/tags
4. Run apt dist-upgrade
5. Run cinder-manage db sync
6. Remove the lines added at step 1, re-run puppet, and test that the upgraded cinder version works.
7. Perfom step 2-4 for the rest of the cinder nodes