[Rdo-list] OpenStack upgrade Icehouse Centos 6 best practice

[Ihar Hrachyshka]

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On 08/17/2015 12:54 PM, Chris wrote:
> Hello,
> 
> 
> 
> We currently plan to upgrade our Openstack setup from Icehouse to
> Juno or even Kilo. This also includes a version upgrade on the host
> based OS from Centos 6.6 to 7.x

That's a huge shift for one step! I suggest you split the OS and
Openstack upgrades into separate phases to simplify the job. I also
don't think upstream supports upgrades that skip a release or two. It
may work, but that's not guaranteed.

> 
> I have some questions regarding the upgrade an hope to learn from
> your experience.
> 
> 
> 
> First question is, is there a Openstack version compatibility
> guaranteed within the different releases? The idea behind it to
> upgrade the different services (compute nodes / management nodes)
> in separate phases.
> 

The usual assumption is that we support backwards compatibility for
one release, so you can stage your upgrades. Note that you should
first upgrade controller services, then agents/computes, not vice versa.

> Second, is the live-migration with block-migrate feature
> compatible between versions. One upgrade solution we currently
> playing with is to move existing VMs with live-migration &
> block-migrate (no shared storage) to fresh installed Centos 7 Kilo
> compute nodes.
> 
> 
> 
> Any best practice tips highly appreciated!
> 
> 
> 
> Cheers,
> 
> Chris
> 
> 
> 
> 
> 
> 
> 
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