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1. Set heat::api::enabled: false and heat::engine::enabled: false and heat::api_cfn::enabled: false in hiera to stop all services
2. Run puppet with train modules/tags
3. Run apt-get update && apt-get dist-upgrade && apt-get autoremove

4. Run heat-manage db_sync on one of the api-nodes.

5. Remove the hiera keys that disabled the services and re-run puppet

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