[Bug 1826419] Re: dhcp agent configured with mismatching domain and host entries

[Brian Murray]

Hello James, or anyone else affected,

Accepted neutron into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/neutron/2:12.0.6-0ubuntu1 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: neutron (Ubuntu Bionic)
       Status: Triaged => Fix Committed

** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1826419

Title:
  dhcp agent configured with mismatching domain and host entries

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive queens series:
  New
Status in Ubuntu Cloud Archive rocky series:
  New
Status in Ubuntu Cloud Archive stein series:
  New
Status in Ubuntu Cloud Archive train series:
  New
Status in neutron:
  In Progress
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Bionic:
  Fix Committed
Status in neutron source package in Cosmic:
  Fix Committed
Status in neutron source package in Disco:
  Fix Committed
Status in neutron source package in Eoan:
  Fix Released

Bug description:
  Related bug 1774710 and bug 1580588

  The neutron-dhcp-agent in OpenStack >= Queens makes use of the
  dns_domain value set on a network to configure the '--domain'
  parameter of the dnsmasq instance that supports it;  at the same time,
  neutron makes use of CONF.dns_domain when creating dns_assignments for
  ports - this results in a hosts file for the dnsmasq instance which
  uses CONF.dns_domain and a --domain parameter of network.dns_domain
  which do not match.

  This results in a search path on instances booted attached to the
  network which is inconsistent with the internal DNS entries that
  dnsmasq responds with:

    root at bionic-045546-2:~# host 192.168.21.222
    222.21.168.192.in-addr.arpa domain name pointer bionic-045546-2.jamespage.internal.
    root at bionic-045546-2:~# host bionic-045546-2
    bionic-045546-2.designate.local has address 192.168.21.222

  In the above example:

    CONF.dns_domain = jamespage.internal.
    network.dns_domain = designate.local.

  Based on previous discussion in bug 1580588 I think that the
  dns_domain value for a network was intented for use for external DNS
  integration such as that provided by Designate.

  The changed made under commit:

    https://opendev.org/openstack/neutron/commit/137a6d61053

  appear to break this assumption, producing somewhat inconsistent
  behaviour in the dnsmasq instance for the network.

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