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From Daan Hoogland <>
Subject Re: [DISCUSS][PROPOSAL] CloudStack Upgrade Policy
Date Tue, 21 Jul 2015 07:24:43 GMT

You wrote this here and on users and I think it is a good proposal.
There is one technical catch and I don't think it is worth bothering
users@ with: our current db installation scheme starts with a 4.0.0
database and performs all upgrade steps from that point onward. This
can be solved in the policy or we can start working on maintaining the
scheme if we drop older upgrade scripts as well.


On Tue, Jul 21, 2015 at 7:09 AM, John Burwell
<> wrote:
> All,
> A recently proposed change [1] to remove older upgrade code has prompted a wider discussion
regarding the policy we should employ regarding upgrade support.  Currently, we have no policy
regarding how far back the process will function.  As the system evolves, it is simply unsustainable
to expect a deliver a reliable upgrade from releases that are many years old (e.g. 3.x to
the latest 4.x). Currently, we do not verify that all upgrade paths work for each release.
> My straw-man proposal is that effective with the 4.6 release, we only support upgrades
from two minor releases back of release with revisions inclusive.  For example, upgrades to
4.6.x would be supported from 4.4.x and 4.5.x.  The upgrade process from releases prior to
4.4.0 would require a two step process — upgrade to the latest version 4.5 release and then
upgrade from the latest 4.5 release to the latest 4.6 release.  This approach provides backwards
compatibility while establishing an upgrade process that is reasonably testable.
> In my opinion, any upgrade policy should satisfy two criteria — support the operational
processes of the majority and be verifiable through automated testing.
> Thanks,
> -John
> [1]:
> ---
> John Burwell (@john_burwell)
> VP of Software Engineering, ShapeBlue
> (571) 403-2411 | +44 20 3603 0542
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