Re: [Rdo-list] OpenStack upgrade Icehouse Centos 6 best practice
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On 08/18/2015 06:21 AM, Chris wrote:
Hello,
Here some more insights and questions:
We have in total 4 separate clouds who need the upgrade with each
more than 100 compute nodes. We just use the basic services like
nova, keystone, neutron, glance and horizon. No Cinder, heat, trove
etc. Our network setup is flat provider network, which means we
don't use the neutron router. All in all the from the openstack
service perspective a minimal setup.
One of our cloud is set up as HA with two management nodes
(keystone, nova, horizon, glance) behind a haproxy. It's not a big
deal to have the same setup implemented in all clouds if it's
helpful for the upgrade
We don't think about upgrading from Centos 6 to 7. Instead build
new Centos 7 compute nodes and move the VMs with live migration (is
it a good idea?)
The database schemes changes between the openstack versions, what
does it affect? Let's say we set up a second management node wit
Centos 7 and the openstack Juno/Kilo services will it work against
the Centos 6/Icehouse compute nodes and the Icehouse DB schema?
It definitely won't work with old schema for most services (nova can
be a single exception, with their support for live data migration).
There is currently no way to run a mixed version setup of management
services. The only mix that is expected to work now is a setup where
management services (those services that have access to database) have
higher versions than agents/compute nodes do (it's expected that RPC
used between management nodes and compute/networking nodes is backward
compatible for at least one major release).
Note that skipping a major version in staged upgrade is not guaranteed
to work (meaning, you should avoid running Icehouse computes against
Kilo controller).
Ihar
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