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How to Upgrade OpenStack from "Grizzly" to "Havana" ?

Hi all.

I just installed recently OpenStack "Grizzly" on Ubuntu Server. It is up and running.

I just seen OpenStack "Havana" has been released.

Is it posible to upgrade my existing OpenStack "Grizzly" to OpenStack "Havana" or do I have to install "Havana" from scratch ?

If it is possible, What do I have to do ? Do I have to install only the new modules on "Havana" (Heat, Metering ...)

Thanks a lot in advance.