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Hi,
Your patch https://review.openstack.org/#/c/480616/ requires that neutron expose the ‘DNS Integration’ extension be support by neutron and the relevant networking plugin. If it does not then will be a gression and things will not work.
In addition to this that is per network and not global so there will also be a regression for running instances if nova is updated.
Thanks
Gary


On 9/4/17, 11:18 AM, "Stephen Finucane" <sfinucan at redhat.com> wrote:

    Nova has a feature whereby it will provide instance host names that cloud-init
    can extract and use inside the guest, i.e. this won't happen without cloud-
    init. These host names are fully qualified domain names (FQDNs) based upon the
    instance name and local domain name. However, as noted in bug #1698010 [1], the
    domain name part of this is based up nova's 'dhcp_domain' option, which is a
    nova-network option that has been deprecated [2].
    
    I've started work on a fix [3] that will allow us to retrieve this information
    from neutron instead, uncoupling us from this legacy option. However, some
    commentators have pointed out that this may not necessarily be what we want to
    do: a FQDN is a hostname and domain name, and using one as a hostname may not
    be that clever nor correct.
    
    My networking fu isn't strong enough to deliver a verdict so I'm hoping someone
    else can make my mind up for me: do we want to migrate this feature to neutron,
    or do we want to stop using FQDN and just use instance names?
    
    Cheers,
    Stephen
    
    [1] https://bugs.launchpad.net/nova/+bug/1698010
    [2] https://review.openstack.org/#/c/395683/
    [3] https://review.openstack.org/#/c/480616/
    
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