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Update - best practice

Hi,

we running a Juno installation of OpenStack with 1 Controller node, 1 Neutron node, 2 Object node, 1 Block node and 9 Compute nodes. We now want to upgrade out installation to Liberty. I already read that this process had to be incremental Juno -> Kilo -> Liberty as far as I understood it.

Is there any "best practice"-guide how to do this and to avoid loosing data in the process?

Kind regards, Michael