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