On 10/31/2017 01:13 AM, haad wrote:
Hi,
We have an OSA installation with 10-12 compute nodes running Mitaka on Ubuntu
16.04. As initially we have not prepared any long term update strategy we would
like to create one now. Plan would be to upgrade it to new OSA
release(Ocata/Pike/Queens) in near future.
Our original plan was to update management/networking/backend at once by using
rolling updates to newer release and then upgrade compute nodes one by one to
new release.. I think that [2] provides a general upgrade manual. Is there any
document describing how are different OSA releases compatible ? Is there any
policy in place about backward compatibility ?
As a general rule, OpenStack only supports an online upgrade of one version at a
time. That is, controller nodes running version N can talk to compute nodes
running version N-1.
If you can tolerate downtime of the API layer, there has been some discussion
around "skip-level" upgrades.
Chris
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