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[Rodolfo Alonso <1655605@xxxxxxxxxxxxxxxxxx>]

Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1655605

Title:
  metadata proxy won't start in dhcp namespace when network(subnet) is
  removed from router

Status in neutron:
  Won't Fix

Bug description:
  When adding network(subnet) into router immediately after creating
  network(subnet), there is no metadata proxy process created in dhcp
  namespace to listen on port 80. It causes problem when deleted
  network(subnet) from router: it won't call metadata service
  successfully until restarting dhcp service. Restarting dhcp service is
  just a workaround and is not acceptable as solution.

  This problem is introduced in Newton release. When adding network, it
  will check whether the network has isolated ipv4 subnet. It queries
  all ports belonging to the network, and see whether there is any port
  used as gateway. if yes, then it thinks the subnet is not isolated. If
  we add subnet to router immediately after creating subnet, the process
  of network creation( creating metadata proxy) and the process of
  adding subnet to interface happens at the same time. The seconds
  process creates port as gateway quickly and then the first process
  checks and treats it no isolated, and then will kill metadata proxy
  created soon earlier.

  # /etc/neutron/dhcp_agent.ini
  enable_isolated_metadata = True
  enable_metadata_network = True

  #execute the following commands in batch without interruption.
  neutron net-create network_1
  neutron subnet-create --name subnet_1 network_1 172.16.255.0/24
  neutron router-interface-add default subnet_1

  # there is no 80 port.
   ip netns exec qdhcp-c5791b7d-ec3e-4e96-9a32-b9d1217ed330 netstat -tunlp
  Active Internet connections (only servers)
  Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
  tcp        0      0 172.16.255.2:53         0.0.0.0:*               LISTEN      16926/dnsmasq
  tcp        0      0 169.254.169.254:53      0.0.0.0:*               LISTEN      16926/dnsmasq
  tcp6       0      0 fe80::f816:3eff:fe80:53 :::*                    LISTEN      16926/dnsmasq
  udp        0      0 172.16.255.2:53         0.0.0.0:*                           16926/dnsmasq
  udp        0      0 169.254.169.254:53      0.0.0.0:*                           16926/dnsmasq
  udp        0      0 0.0.0.0:67              0.0.0.0:*                           16926/dnsmasq
  udp6       0      0 :::547                  :::*                                16926/dnsmasq
  udp6       0      0 fe80::f816:3eff:fe80:53 :::*                                16926/dnsmasq

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