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[Launchpad Bug Tracker <1780407@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1780407

Title:
  There are some errors in neutron_l3_agent and neutron_dhcp_agent after
  restarting open vswitch with dpdk

Status in neutron:
  Expired

Bug description:
  Environment: all in one.
  OpenStack: Queens
  Open vSwitch: 2.9.0
  DPDK: 17.11.2
  QEMU: 2.11
  Private network: client-net, 10.10.10.0/24, gateway 10.10.10.1, dhcp server 10.10.10.2.

  After restart the Open vSwitch with dpdk, there are some errors in
  neutron-l3-agent.log and neutron-dhcp-agent.log. The detailed content
  is as follows.

  neutron-l3-agent.log:
  2018-07-06 16:43:35.212 34 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: send error: Connection refused
  2018-07-06 16:43:35.214 34 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: connection dropped (Connection refused)
  2018-07-06 16:43:37.216 34 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: send error: Connection refused
  2018-07-06 16:43:37.217 34 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: connection dropped (Connection refused)

  neutron-dhcp-agent.log:
  2018-07-06 16:43:35.211 7 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: send error: Connection refused
  2018-07-06 16:43:35.212 7 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: connection dropped (Connection refused)
  2018-07-06 16:43:37.215 7 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: send error: Connection refused
  2018-07-06 16:43:37.216 7 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: connection dropped (Connection refused)

  In the qrouter namespace, the status of the gateway interface for a private network is down. So the gateway interface can not communicate with the dhcp server interface and virtual machines any more.
  root@B-6-7:~# ip netns
  qrouter-45a13539-c98c-45e9-aab6-2db6dfd687bf
  qdhcp-c9b5cf2d-4df9-47fb-865c-cdb6e7bacd07
  root@B-6-7:~#
  root@B-6-7:~# ip netns exec qrouter-45a13539-c98c-45e9-aab6-2db6dfd687bf ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host
         valid_lft forever preferred_lft forever
  20: qr-ac3740b8-b4: <NO-CARRIER,BROADCAST,PROMISC,UP> mtu 1450 qdisc pfifo_fast state DOWN group default qlen 1000
      link/ether fa:16:3e:88:0b:cf brd ff:ff:ff:ff:ff:ff
      inet 10.10.10.1/24 brd 10.10.10.255 scope global qr-ac3740b8-b4
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe88:bcf/64 scope link
         valid_lft forever preferred_lft forever
  root@B-6-7:~#
  root@B-6-7:~# ip netns exec qrouter-45a13539-c98c-45e9-aab6-2db6dfd687bf ping 10.10.10.2
  PING 10.10.10.2 (10.10.10.2) 56(84) bytes of data.
  From 10.10.10.1 icmp_seq=1 Destination Host Unreachable
  From 10.10.10.1 icmp_seq=2 Destination Host Unreachable
  From 10.10.10.1 icmp_seq=3 Destination Host Unreachable
  ^C
  --- 10.10.10.2 ping statistics ---
  6 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4999ms
  pipe 4

  As the same, in the qdhcp namespace, the status of the dhcp server
  interface is down too. The dhcp server can not work any more.

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