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Adding a dns server adds more complexity into the mix. You need to support both a dns server and a metadata server at that point.

________________________________
From: Kevin Benton [blak111 at gmail.com]
Sent: Friday, September 04, 2015 1:25 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Neutron] cloud-init IPv6 support

Thanks for pointing that out. I like the DNS option too. That has to be done carefully though to make sure it's not easy for an attacker to get the name of the DNS entry that the instance tries to look up.

On Fri, Sep 4, 2015 at 10:53 AM, Henry Gessau <gessau at cisco.com<mailto:gessau at cisco.com>> wrote:
Some thought has been given to this. See
https://bugs.launchpad.net/neutron/+bug/1460177

I like the third option, a well-known name using DNS.


On Thu, Sep 03, 2015, Kevin Benton <blak111 at gmail.com><mailto:blak111 at gmail.com> wrote:
I think that's different than what is being asked here. That patch appears to just add IPv6 interface information if it's available in the metadata. This thread is about getting cloud-init to connect to an IPv6 address instead of 169.254.169.254 for pure IPv6 environments.

On Thu, Sep 3, 2015 at 11:41 AM, Joshua Harlow <harlowja at outlook.com<mailto:harlowja at outlook.com>> wrote:
I'm pretty sure this got implemented :)

http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/revision/1042<http://bazaar.launchpad.net/%7Ecloud-init-dev/cloud-init/trunk/revision/1042> and https://bugs.launchpad.net/cloud-init/+bug/1391695

That's the RHEL support, since cloud-init translates a ubuntu style networking style the ubuntu/debian style format should also work.


Steve Gordon wrote:
----- Original Message -----
From: "Kevin Benton"<blak111 at gmail.com<mailto:blak111 at gmail.com>>

When we discussed this before on the neutron channel, I thought it was
because cloud-init doesn't support IPv6. We had wasted quite a bit of time
talking about adding support to our metadata service because I was under
the impression that cloud-init already did support IPv6.

IIRC, the argument against adding IPv6 support to cloud-init was that it
might be incompatible with how AWS chooses to implement IPv6 metadata, so
AWS would require a fork or other incompatible alternative to cloud-init in
all of their images.

Is that right?

That's certainly my understanding of the status quo, I was enquiring primarily to check it was still accurate.

-Steve

On Thu, Sep 3, 2015 at 7:30 AM, Sean M. Collins<<mailto:sean at coreitpro.com>sean at coreitpro.com<mailto:sean at coreitpro.com>>  wrote:

It's not a case of cloud-init supporting IPv6 - The Amazon EC2 metadata
API defines transport level details about the API - and currently only
defines a well known IPv4 link local address to connect to. No well known
link local IPv6 address has been defined.

I usually recommend config-drive for IPv6 enabled clouds due to this.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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