If you can add additional compute nodes, then create networks in neutron with the same network range as nova-network and then migrate the VMs from old compute node to new compute nodes with neutron support.
On Wed, Jul 29, 2015 at 12:02 AM, Andrew Bogott <abog...@wikimedia.org> wrote: > I'm running Icehouse with the 'legacy' nova-network service and a single > network node. > > Everything in my cluster is running Ubuntu Trusty and ready for an upgrade > to Juno, except for my network node, which is still running Precise. How > do I upgrade it without causing cloud-wide downtime? I can think of a few > approaches, none of which I feel confident about undertaking: > > 1: Build a new network node running Trusty, and then nudge existing VMs > off of the old node and onto the new one. I've gotten fairly far down this > path, but just realized that I don't have any idea how to do the 'nudge' > step. > > 2: Switch my network to multi-node mode, add a new network node, somehow > inform VMs about the new secondary node, then upgrade and reboot network > nodes one at a time and rely on the instances to fail over to the running > node during upgrade. > > 3: Stop having special-purpose network nodes altogether and adopt the > (more-modern, as I understand it) approach of running nova-network on each > compute node. This seems ideal in the long run, but also maximize the > amount of tinkering and potential disaster. > > Has anyone done this? #2 seems like the obvious approach since it gets me > some redundancy in the long run, but I'm not at all clear on what the steps > are given an already-running-and-useful network. I have the feeling that > I've read a guide about upgrade-via-migration which would closely resemble > #1 but I can no longer find that document. > > Thank you! > > -Andrew > > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >
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