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To upgrade cinder without any downtime, follow this procedure

1. Purge old DB-records
   1. cinder-manage db purge 0
2. 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

3. Run puppet on the first host with ussuri modules/tags
4. Run apt-get autoremove && apt-get dist-upgrade
5. Run puppet again
6. Run cinder-manage db sync && cinder-manage db online_data_migrations
7. Remove the lines added at step 1, re-run puppet, and test that the upgraded cinder version works.
8. Perfom step 2-4 5 for the rest of the cinder nodes