On Wed, Mar 18, 2020 at 11:29 AM Bence Romsics <[email protected]> wrote:
> Hi Everyone, > > I'm also from OpenStack, just wanted to add an idea and a question. > > > > - In what order should cloud-init try ipv6 and ipv4? > > > - cloud-init would prefer to know which one it should use so we > don't timeout on an endpoint that isn't there. > > > > I would say that it it could be checked what IP addresses are configured > in the guest OS already and use correct one if only one type of addresses > is there. If there would be both IPv4 and IPv6, it could try IPv4 first as > it is like that now. What do You think about such solution? > > Alternatively we may delay this decision by adding a new data source > 'OpenStackIPv6' and then the cloud image builder can order 'OpenStack' > and 'OpenStackIPv6' in datasource_list as they see fit. > This could help. cloud-init would very much like to distinguish which datasource to use via non-network indication. Cloud-init currently detects that it should use OpenStack datasource via DMI table values. As I mentioned just recently in another reply; this isn't perfect for non-x86 architectures, and it may be heavy handed to modify the DMI string emitted for VMs who just happen to be running on ipv6 enabled metadata service clouds. > My question relates to the use of link-local addresses as it is also > commented on review.opendev.org. With my limited IPv6 experience, a > URL with a link-local address but without a zone is incomplete, right? > This is incomplete: http://[fe80::a9:fe:a9:fe]/. On the other hand > this is complete: http://[fe80::a9:fe:a9:fe%25eth0]/. At the time of > configuring cloud-init nobody will be able to predict the > guest-internal interface names. Is it okay for cloud-init to take the > incomplete address and discover the interface(s) to be used? > cloud-init already uses a deterministic heuristic to pick the "best" interface on which to reach metadata service. Cloud-init will supply the interface scope when accessing the ipv6 metadata URL. > Thank you, > Bence Romsics > rubasov on freenode >
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