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On the API node:

Run puppet with the pike the queens modules/tags
Run apt-get dist-upgrade
Migrate the databases
1. nova-manage api_db sync
2. nova-manage db sync
Restart services

On the services node:

Run puppet with the pike the queens modules/tags
Run apt-get dist-upgrade
Restart services

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On the API node:

Run puppet with the pike the queens modules/tags
Run apt-get dist-upgrade
heat-manage db_sync
restart heat services

On the engine node:

Run puppet with the pike the queens modules/tags
Run apt-get dist-upgrade
Restart heat-engine

Horizon

Run puppet with the queens modules/tags
run apt-get dist-upgrade
Run puppet again
restart apache2

Compute-nodes

When controllers etc. are upgraded, it is time to do the same on the comute-nodes. Compute nodes are simple to upgrade:

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