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Reviewed:  https://review.openstack.org/556584
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=bb5138cff4e6c383d4d9e902423072a1493832b9
Submitter: Zuul
Branch:    master

commit bb5138cff4e6c383d4d9e902423072a1493832b9
Author: Miguel Lavalle <miguel.lavalle@xxxxxxxxxx>
Date:   Mon Mar 26 11:20:18 2018 -0500

    Fix DHCP isolated subnets with routed networks
    
    After the merge of [1], the DHCP agent will fail to configure a routed
    network when attempting to generate host routes for a non-local subnet
    that is also isolated from the point of view of the metadata service.
    This patch adds a check to make sure that the host route is not added
    for non-local subnets.
    
    [1] https://review.openstack.org/#/c/468744
    
    Change-Id: Ia03f538a7d2d10d600d9359da5b3a74532709d1f
    Closes-Bug: #1758952


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1758952

Title:
  DHCP agent fails to configure routed networks due to failure
  generating subnet options

Status in neutron:
  Fix Released

Bug description:
  In a routed networks environment, after the merge of
  https://review.openstack.org/#/c/468744, the dhcp agent attempts to
  generate subnet options for both local and non local subnets. If one
  of the non-local subnets is classified as isolated from the point of
  view of the metadata service, the following traceback occurs:

  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for 40dcd8c6-e4a1-4510-ac62-f37c11e65a5a.: KeyError: u'2cbde018-1c03-40f8-9d67-90a03c7ebd37'
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 144, in call_driver
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 219, in enable
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     self.spawn_process()
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 446, in spawn_process
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     self._spawn_or_reload_process(reload_with_HUP=False)
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 455, in _spawn_or_reload_process
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     self._output_config_files()
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 499, in _output_config_files
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     self._output_opts_file()
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 872, in _output_opts_file
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     options, subnet_index_map = self._generate_opts_per_subnet()
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 933, in _generate_opts_per_subnet
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent     subnet_dhcp_ip and subnet.ip_version == 4):
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent KeyError: u'2cbde018-1c03-40f8-9d67-90a03c7ebd37'
  Mar 26 15:21:41 compute2 neutron-dhcp-agent[31181]: ERROR neutron.agent.dhcp.agent 

  This traceback is due to the fact that the non-local subnet in
  question has no interface in the DHCP agent namespace, so it is not
  found when:

  subnet_dhcp_ip = subnet_to_interface_ip[subnet.id]

  is executed

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