[Openstack] OpenStack upgrade Icehouse Centos 6 best practice

Chris contact at progbau.de
Tue Aug 18 03:45:24 UTC 2015



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

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

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!





From: Remo Mattei [mailto:Remo at Italy1.com] 
Sent: Monday, August 17, 2015 19:54
To: Chris <contact at progbau.de>
Cc: openstack at lists.openstack.org; Mark Hollow <mark at markhollow.com>;
Soputhi Sea <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. 




On Aug 17, 2015, at 12:53, Chris <contact at progbau.de
<mailto:contact at progbau.de> > wrote:




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


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!








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