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To upgrade cinder without any downtime, follow this procedure

1. Add the following line to hiera:

   1. cinder::keystone::authtoken::system_scope: 'all'

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

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