Open Stack

I am struggling to find a solution given the following:


-          A cluster of two or more servers

-          Each server has a storage volume attached

-          If a server goes down (disappears) it should attach to the same (identical content) volume when it is re-created

-          Minimal manual intervention for all life-cycle use cases

-          Fully managed vi Heat


If it would be possible to define the following logic, it would be great, but I have not found any way to do this:


-          For each server, pre-declare the name of the volume to attach

-          When server is created and a volume with the pre-declared name exists, that volume is attached

-          When a server is created and a volume with the pre-declared name does not exist, such a volume is automatically created

-          When a server is deleted, its attached volume is deattached but not deleted (could do this using “deletion_policy: ‘Retain’” )

I would be happy to receive feedback on any idea that will take me closer to a solution.

I have tried to use “external_id:” in conjunction with OS::Cinder::Volume in order to get a pre-declared name for each volume, but that did not work as I expected it to. I ma currently on “Newton”.

Thanks
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