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[Harald Jensås <harald.jensas@xxxxxxxxx>]

Public bug reported:

The resolv.conf gets populated with whatever the last interface that
came up over DHCP provided.

Even if the 2nd network/subnet in neutron doesn’t define DNS, it still
overwrites resolv.conf.

By default the dnsmasq agent will use itself, and it's pairs as DNS servers if no dns_servers are provided for the neutron subnet. Ref:
  https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L877:L887
  https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L970

This is not always desired. Is there a way to disable this behaviour,
and simply not offer any dns servers if there are none specified in the
neutron subnet?

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1691047

Title:
  dhcp agent - multiple interfaces, last iface coming up overwrite
  resolv.conf

Status in neutron:
  New

Bug description:
  The resolv.conf gets populated with whatever the last interface that
  came up over DHCP provided.

  Even if the 2nd network/subnet in neutron doesn’t define DNS, it still
  overwrites resolv.conf.

  By default the dnsmasq agent will use itself, and it's pairs as DNS servers if no dns_servers are provided for the neutron subnet. Ref:
    https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L877:L887
    https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L970

  This is not always desired. Is there a way to disable this behaviour,
  and simply not offer any dns servers if there are none specified in
  the neutron subnet?

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