Hello operator friends,
We're laying out our 2016 roadmaps now, and one of the projects the Bloomberg
cloud team would like to undertake is migrating from our legacy nova-network
setup to Neutron. Our current networking is pretty simple, with tenancies
getting /25s carved out from a single large subnet for fixed IPs and floating
IPs being assigned from another large subnet as first-come-first serve. While
there's room for improvement, we are totally fine with the initial Neutron
migration replicating as close to the same user experience as possible; our
primary interest now is just getting to Neutron, then taking on larger
overhauls once we're free to navigate in the Neutron universe.
That being said, there's very little material out there on people successfully
pulling off nova-network to Neutron migrations. References on the docs wiki to
Neutron migration materials are unfinished and mostly lead to some year-old
abandoned changes in Gerrit, and Google inexorably leads to the same eBay
presentation about migrating from Folsom nova-network to Havana Neutron+NSX
SDN. It has some interesting and useful information, but it's also about old
releases and involved a lot of additional changes (Folsom->Havana, integrating
NSX, etc.), whereas we're just interested in moving from nova-network to
Neutron in place on our Kilo clusters and carrying as little else along for the
ride as possible.
Therefore, I come to you all to ask for battle stories from anyone who's gone
up against migrating to Neutron and lived to tell the tale. Do your users
roundly curse you and speak angrily of the Great Networking Betrayal, where you
lost all their floating IPs and security groups, or are you celebrated as the
great warlord who slew the diabolical iptables NAT monster and brought peace
and stability (and LBaaS) to cloud networks everywhere?
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