neutron

Multiple tap device in HA dhcp namespace for the same subnet

Bug #1515535 reported by peng fei wang on 2015-11-12

This bug report is a duplicate of: Bug #1509959: Stale DHCP ports remain in DHCP namespace. Edit Remove

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	neutron	New	Undecided	Unassigned

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

See original description

peng fei wang (wpf) on 2015-11-12

description:

updated

Revision history for this message

Hong Hui Xiao (xiaohhui) wrote on 2015-11-12:

I think it is a duplicated bug of Bug #1509959

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