On Mon, 7 Jul 2014, CARVER, PAUL wrote: > > Andrew Mann wrote: > >What's the use case for an IPv6 endpoint? This service is just for instance > >metadata, > >so as long as a requirement to support IPv4 is in place, using solely an > >IPv4 endpoint > >avoids a number of complexities: > > The obvious use case would be deprecation of IPv4, but the question is when. > Should I > expect to be able to run a VM without IPv4 in 2014 or is IPv4 mandatory for > all VMs? > What about the year 2020 or 2050 or 2100? Do we ever reach a point where we > can turn > off IPv4 or will we need IPv4 for eternity? > > Right now it seems that we need IPv4 because cloud-init itself doesn’t appear > to support > IPv6 as a datasource. I’m going by this documentation > http://cloudinit.readthedocs.org/en/latest/topics/datasources.html#what-is-a-datasource > where the “magic ip” of 169.254.169.254 is referenced as well as some non-IP > mechanisms. > > It wouldn’t be sufficient for OpenStack to support an IPv6 metadata address > as long as > most tenants are likely to be using a version of cloud-init that doesn’t know > about IPv6 > so step one would be to find out whether the maintainer of cloud-init is open > to the > idea of IPv4-less clouds.
Most certainly, patches that are needed to cloud-init to support functioning in a IPv4-less cloud are welcome. >From an Ubuntu perspective, as long as the changes are safe from breaking things, we'd also probably be able to get them into the official ubuntu 14.04 cloud images. > If so, then picking a link local IPv6 address seems like the obvious thing to > do and the > update to Neutron should be pretty trivial. There are a few references to that > “magic ip” > https://github.com/openstack/neutron/search?p=2&q=169.254.169.254&ref=cmdform > but the main one is the iptables redirect rule in the L3 agent: > https://github.com/openstack/neutron/blob/master/neutron/agent/l3_agent.py#L684
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