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1. Set glance::sync_db: false in a global hiera-file
2. 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.
3. Run puppet on the first host with the rocky modules/tags
4. Run apt dist-upgrade
5. Run glance-manage db expand
6. Run glance-manage db migrate
7. 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.
8. Upgrade the rest of the glance hosts (ie; step 3 + 4 for each of the remaining glance hosts)
9. Run glance-manage db_contract
10. Remove glance::sync_db: false in a global hiera-file

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