[Openstack] OpenStack upgrade Icehouse Centos 6 best practice

Remo Mattei Remo at Italy1.com
Tue Aug 18 08:39:27 UTC 2015

Hi all, 
still #1 has not been answered :) 
but I would suggest to look at this link which has lots of info and will answer your questions below. 

https://wiki.openstack.org/wiki/ReleaseNotes/Juno <https://wiki.openstack.org/wiki/ReleaseNotes/Juno>


> On Aug 18, 2015, at 05:45, Chris <contact at progbau.de> wrote:
> Hello,
> 1)      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.
> 2)      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
> 3)      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?)
> 4)      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?
> Thanks in advance!
> Cheers,
> Chris
> From: Remo Mattei [mailto:Remo at Italy1.com <mailto:Remo at Italy1.com>] 
> Sent: Monday, August 17, 2015 19:54
> To: Chris <contact at progbau.de <mailto:contact at progbau.de>>
> Cc: openstack at lists.openstack.org <mailto:openstack at lists.openstack.org>; Mark Hollow <mark at markhollow.com <mailto:mark at markhollow.com>>; Soputhi Sea <puthi at live.com <mailto:puthi at live.com>>
> Subject: Re: [Openstack] OpenStack upgrade Icehouse Centos 6 best practice
> Well this can be very time consuming but first thing first
> 1) how is your installation done?
> 2) is this an HA env?
> 3) chaining from 6.x to 7 is good but may not play well 
> 4) database schema changed from Icehouse to Juno so keep that in mind. 
> Then you can start thinking on the upgrades. I know some of my coworker had hard time to upgrade. Recommended is rebuild / migrate. 
> Ciao
> Remo  
>> On Aug 17, 2015, at 12:53, Chris <contact at progbau.de <mailto:contact at progbau.de>> 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
>> 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.
>> 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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