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1. Run puppet with the ussuri modules/tags
2. Purge the keystone and apache2 package
3. Run apt-get autoremove && apt dist-upgrade && apt clean && apt autoclean

4. Run puppet again
   1. This will re-install keystone (ensure that apache2 does not start - should be ensured by puppet as of the enable: false flag in hiera)
5. Run keystone-manage doctor and ensure nothing is wrong
6. Run keystone-manage db_sync --expand
   1. Returns nothing
7. Run keystone-manage db_sync --migrate
   1. Returns nothing
8. At this point, you may restart apache2 on this node
   1. Remove the  apache::service_ensure: 'stopped' previously set in hiera.
9. Upgrade keystone on the other nodes, one at a time
   1. Basically run step 1-5 on the other nodes
10. When all nodes are upgraded, perform the final DB sync
    1. keystone-manage db_sync --contract

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