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- This documents expects that your cloud is deployed with the latest queens tag(vQ.n.n) of the ntnuopenstack repository.
- Your cloud is designed with one of the two architectures:
- Each openstack project have their own VM(s) for their services
- You have a recent mysql backup in case things go south.
- If you want to do a rolling upgrade, the following key should be set in hiera long enough in advance that all hosts have had an puppet-run to apply it:
nova::upgrade_level_compute: 'auto'
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VM-based architecture
If you use the VM based infrastructure you have the luxury of upgrading one service at a time and test that the upgrade works before doing the next service. This allows for ~zero downtime. If the services are redundantly deployed it is also very easy to do a rollback.
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