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[Mark Goddard <mark@xxxxxxxxxxxx>]

It looks like this was caused by https://review.opendev.org/#/c/655208/,
which changes the handling of defaults for config in horizon. Since we
override the OPENSTACK_NEUTRON_NETWORK variable in local_settings.py,
but do not include the default for 'default_dns_nameservers'. A simple
workaround for kolla-ansible is to include the default empty list value
in our override.

I think this is a bug in horizon though - they should still tolerate
missing defaults in dict format config variables.

** Also affects: horizon
   Importance: Undecided
       Status: New

** Changed in: kolla-ansible
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1843104

Title:
  KeyError: 'default_dns_nameservers' in Horizon

Status in OpenStack Dashboard (Horizon):
  New
Status in kolla-ansible:
  Triaged

Bug description:
  With:
  kolla_base_distro: "ubuntu"
  kolla_install_type: "source"
  openstack_release: "master"
  and images built on 20190820

  Trying to:
  -> Create a network via Horizon (Create Network dialog)

  I get:
  -> Instant Horizon "Danger" error
  -> "KeyError: 'default_dns_nameservers'" in /var/log/kolla/horizon/horizon.log): http://paste.openstack.org/show/772115/

  Right now I'm working around this by:
  https://github.com/igordcard/homedc/blob/master/scripts/kolla/master/bionic
  /fix-horizon-default_dns_nameservers-after.sh#L20

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