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[Bug 1515535] [NEW] Multiple tap device in HA dhcp namespace for the same subnet

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Public bug reported:

in an HA environment( 3 controller node in Kilo), normally,the DHCP agent works well,  when I create an network for 192.168.1.0/24,
commonly, the ip for dhcp port will be 192.168.1.2/3/4.

   but after some testcases, either by restart the HOST, or unplug the
HOST networks ( I am not sure about the concrete reason),

  the dhcp netns changes as below:

   in general , a)  the ip for tap device in the namespace changed.  b)
the 1st dhcp ns has one tap device, and 2nd has two tap device, and 3rd
has three

------------------------------------------------------------------------------------------------------------------

[root@controller1 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    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: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
    inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe1f:5799/64 scope link
       valid_lft forever preferred_lft forever

[root@controller2 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    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
14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
    inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe1f:5799/64 scope link
       valid_lft forever preferred_lft forever
129: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
    inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe1a:dd18/64 scope link
       valid_lft forever preferred_lft forever

[root@controller3 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    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
14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
    inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe1f:5799/64 scope link
       valid_lft forever preferred_lft forever
17: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
    inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe1a:dd18/64 scope link
       valid_lft forever preferred_lft forever
141: tapf300a0aa-ae: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:5e:fe:92 brd ff:ff:ff:ff:ff:ff
    inet 192.168.207.186/24 brd 192.168.207.255 scope global tapf300a0aa-ae
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tapf300a0aa-ae
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe5e:fe92/64 scope link
       valid_lft forever preferred_lft forever

** Affects: neutron
     Importance: Undecided
         Status: New

** Description changed:

-     in an HA environment( 3 controller node), normally,the DHCP agent works well,  when I create an network for 192.168.1.0/24, 
+ in an HA environment( 3 controller node in Kilo), normally,the DHCP agent works well,  when I create an network for 192.168.1.0/24,
  commonly, the ip for dhcp port will be 192.168.1.2/3/4.
  
-    but after some testcases, either by restart the HOST, or unplug the
+    but after some testcases, either by restart the HOST, or unplug the
  HOST networks ( I am not sure about the concrete reason),
  
-   the dhcp netns changes as below:
-    
-    in general , a)  the ip for tap device in the namespace changed.  b)  the 1st dhcp ns has one tap device, and 2nd has two tap device, and 3rd has three
+   the dhcp netns changes as below:
+ 
+    in general , a)  the ip for tap device in the namespace changed.  b)
+ the 1st dhcp ns has one tap device, and 2nd has two tap device, and 3rd
+ has three
  
  ------------------------------------------------------------------------------------------------------------------
  
  [root@controller1 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
-     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: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
-     link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
-     inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
-        valid_lft forever preferred_lft forever
-     inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
-        valid_lft forever preferred_lft forever
-     inet6 fe80::f816:3eff:fe1f:5799/64 scope link 
-        valid_lft forever preferred_lft forever
+ 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
+     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: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
+     link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
+     inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
+        valid_lft forever preferred_lft forever
+     inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
+        valid_lft forever preferred_lft forever
+     inet6 fe80::f816:3eff:fe1f:5799/64 scope link
+        valid_lft forever preferred_lft forever
  
  [root@controller2 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
-     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
- 14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
-     link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
-     inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
-        valid_lft forever preferred_lft forever
-     inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
-        valid_lft forever preferred_lft forever
-     inet6 fe80::f816:3eff:fe1f:5799/64 scope link 
-        valid_lft forever preferred_lft forever
- 129: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
-     link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
-     inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
-        valid_lft forever preferred_lft forever
-     inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
-        valid_lft forever preferred_lft forever
-     inet6 fe80::f816:3eff:fe1a:dd18/64 scope link 
-        valid_lft forever preferred_lft forever
+ 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
+     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
+ 14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
+     link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
+     inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
+        valid_lft forever preferred_lft forever
+     inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
+        valid_lft forever preferred_lft forever
+     inet6 fe80::f816:3eff:fe1f:5799/64 scope link
+        valid_lft forever preferred_lft forever
+ 129: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
+     link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
+     inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
+        valid_lft forever preferred_lft forever
+     inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
+        valid_lft forever preferred_lft forever
+     inet6 fe80::f816:3eff:fe1a:dd18/64 scope link
+        valid_lft forever preferred_lft forever
  
  [root@controller3 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
-     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
- 14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
-     link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
-     inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
-        valid_lft forever preferred_lft forever
-     inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
-        valid_lft forever preferred_lft forever
-     inet6 fe80::f816:3eff:fe1f:5799/64 scope link 
-        valid_lft forever preferred_lft forever
- 17: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
-     link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
-     inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
-        valid_lft forever preferred_lft forever
-     inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
-        valid_lft forever preferred_lft forever
-     inet6 fe80::f816:3eff:fe1a:dd18/64 scope link 
-        valid_lft forever preferred_lft forever
- 141: tapf300a0aa-ae: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
-     link/ether fa:16:3e:5e:fe:92 brd ff:ff:ff:ff:ff:ff
-     inet 192.168.207.186/24 brd 192.168.207.255 scope global tapf300a0aa-ae
-        valid_lft forever preferred_lft forever
-     inet 169.254.169.254/16 brd 169.254.255.255 scope global tapf300a0aa-ae
-        valid_lft forever preferred_lft forever
-     inet6 fe80::f816:3eff:fe5e:fe92/64 scope link 
-        valid_lft forever preferred_lft forever
+ 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
+     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
+ 14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
+     link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
+     inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
+        valid_lft forever preferred_lft forever
+     inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
+        valid_lft forever preferred_lft forever
+     inet6 fe80::f816:3eff:fe1f:5799/64 scope link
+        valid_lft forever preferred_lft forever
+ 17: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
+     link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
+     inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
+        valid_lft forever preferred_lft forever
+     inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
+        valid_lft forever preferred_lft forever
+     inet6 fe80::f816:3eff:fe1a:dd18/64 scope link
+        valid_lft forever preferred_lft forever
+ 141: tapf300a0aa-ae: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
+     link/ether fa:16:3e:5e:fe:92 brd ff:ff:ff:ff:ff:ff
+     inet 192.168.207.186/24 brd 192.168.207.255 scope global tapf300a0aa-ae
+        valid_lft forever preferred_lft forever
+     inet 169.254.169.254/16 brd 169.254.255.255 scope global tapf300a0aa-ae
+        valid_lft forever preferred_lft forever
+     inet6 fe80::f816:3eff:fe5e:fe92/64 scope link
+        valid_lft forever preferred_lft forever

-- 
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https://bugs.launchpad.net/bugs/1515535

Title:
  Multiple tap device in HA dhcp namespace for the same subnet

Status in neutron:
  New

Bug description:
  in an HA environment( 3 controller node in Kilo), normally,the DHCP agent works well,  when I create an network for 192.168.1.0/24,
  commonly, the ip for dhcp port will be 192.168.1.2/3/4.

     but after some testcases, either by restart the HOST, or unplug the
  HOST networks ( I am not sure about the concrete reason),

    the dhcp netns changes as below:

     in general , a)  the ip for tap device in the namespace changed.
  b)  the 1st dhcp ns has one tap device, and 2nd has two tap device,
  and 3rd has three

  ------------------------------------------------------------------------------------------------------------------

  [root@controller1 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
      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: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
      link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
      inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
         valid_lft forever preferred_lft forever
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe1f:5799/64 scope link
         valid_lft forever preferred_lft forever

  [root@controller2 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
      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
  14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
      link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
      inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
         valid_lft forever preferred_lft forever
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe1f:5799/64 scope link
         valid_lft forever preferred_lft forever
  129: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
      link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
      inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
         valid_lft forever preferred_lft forever
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe1a:dd18/64 scope link
         valid_lft forever preferred_lft forever

  [root@controller3 ~]# ip netns exec qdhcp-dde8c382-0660-41a8-bbcc-cdc7e0b8b20a ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
      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
  14: tap1ea190c7-d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
      link/ether fa:16:3e:1f:57:99 brd ff:ff:ff:ff:ff:ff
      inet 192.168.207.184/24 brd 192.168.207.255 scope global tap1ea190c7-d8
         valid_lft forever preferred_lft forever
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tap1ea190c7-d8
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe1f:5799/64 scope link
         valid_lft forever preferred_lft forever
  17: tape6f6da9c-34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
      link/ether fa:16:3e:1a:dd:18 brd ff:ff:ff:ff:ff:ff
      inet 192.168.207.185/24 brd 192.168.207.255 scope global tape6f6da9c-34
         valid_lft forever preferred_lft forever
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tape6f6da9c-34
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe1a:dd18/64 scope link
         valid_lft forever preferred_lft forever
  141: tapf300a0aa-ae: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
      link/ether fa:16:3e:5e:fe:92 brd ff:ff:ff:ff:ff:ff
      inet 192.168.207.186/24 brd 192.168.207.255 scope global tapf300a0aa-ae
         valid_lft forever preferred_lft forever
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tapf300a0aa-ae
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe5e:fe92/64 scope link
         valid_lft forever preferred_lft forever

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