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Message #32989
[Bug 1456460] [NEW] Garbage DHCP tap exist in the net namespace after deleting one subnet of a net
Public bug reported:
1 create net and mutiple subnet
#neutron net-create net_test_1
Created a new network:
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | True |
| attached_port_num | 0 |
| bandwidth | 0 |
| id | f2929812-9d56-445b-93ac-a02be1999d27 |
| max_server_num | 50 |
| mtu | 1500 |
| name | net_test_1 |
| provider:network_type | vlan |
| provider:physical_network | physnet1 |
| provider:segmentation_id | 7 |
| shared | False |
| status | ACTIVE |
| subnets | |
| tenant_id | e742cba978bd478caaaa03bc388c373e |
| vlan_transparent | False |
+---------------------------+--------------------------------------+
2 neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.0.0/24
neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.1.0/24
neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.2.0/24
neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.3.0/24
neutron net-list
+--------------------------------------+------------+-----------------------------------------------------+
| id | name | subnets |
+--------------------------------------+------------+-----------------------------------------------------+
| f2929812-9d56-445b-93ac-a02be1999d27 | net_test_1 | 055fd491-7f50-422c-8740-8406c73602d8 20.0.3.0/24 |
| | | 144724d9-c7c4-44d9-a725-64bb7a3091cc 20.0.1.0/24 |
| | | bc9ddb46-d98d-4b2c-9a1e-1ec6babcb1a9 20.0.2.0/24 |
| | | d26d13e4-356f-4602-957b-6ac1ca533506 20.0.0.0/24 |
+--------------------------------------+------------+-----------------------------------------------------+
3 create a port, and boot up vm
#neutron port-create net_test_1 --name port_test_1
#nova boot --flavor m1.small --image e05c4659-2e5b-472d-9eae-01bc6564e8f3 --nic port-id=40306a52-cc4e-45ad-a5a6-8c11468c8d68 vm_test_1
nova list
+--------------------------------------+-----------+--------+------------+-------------+---------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-----------+--------+------------+-------------+---------------------+
| 53c54d5e-2fc8-4315-9903-316fedb81936 | vm_test_1 | BUILD | spawning | NOSTATE | net_test_1=20.0.3.2 |
+--------------------------------------+-----------+--------+------------+-------------+---------------------+
4 query DHCP tap of the net namespace
#ip netns
qdhcp-f2929812-9d56-445b-93ac-a02be1999d27
# ip netns exec qdhcp-f2929812-9d56-445b-93ac-a02be1999d27 ifconfig -a
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 3 bytes 1180 (1.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3 bytes 1180 (1.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap4a60362f-c1: flags=67<UP,BROADCAST,RUNNING> mtu 1500
inet 20.0.0.2 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::f816:3eff:fe2d:906d prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:2d:90:6d txqueuelen 0 (Ethernet)
RX packets 38 bytes 2760 (2.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 1468 (1.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
5 delete one unused subnet
# neutron subnet-delete bc9ddb46-d98d-4b2c-9a1e-1ec6babcb1a9
Deleted subnet: bc9ddb46-d98d-4b2c-9a1e-1ec6babcb1a9
# neutron net-list
+--------------------------------------+------------+-----------------------------------------------------+
| id | name | subnets |
+--------------------------------------+------------+-----------------------------------------------------+
| f2929812-9d56-445b-93ac-a02be1999d27 | net_test_1 | 055fd491-7f50-422c-8740-8406c73602d8 20.0.3.0/24 |
| | | 144724d9-c7c4-44d9-a725-64bb7a3091cc 20.0.1.0/24 |
| | | d26d13e4-356f-4602-957b-6ac1ca533506 20.0.0.0/24 |
+--------------------------------------+------------+-----------------------------------------------------+
6 query DHCP tap of the net namepace
#ip netns exec qdhcp-f2929812-9d56-445b-93ac-a02be1999d27 ifconfig -a
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 7 bytes 1504 (1.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 1504 (1.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap03466191-47: flags=67<UP,BROADCAST,RUNNING> mtu 1500
inet 20.0.0.3 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::f816:3eff:fe06:6360 prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:06:63:60 txqueuelen 0 (Ethernet)
RX packets 10 bytes 420 (420.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9 bytes 738 (738.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap4a60362f-c1: flags=67<UP,BROADCAST,RUNNING> mtu 1500
inet 20.0.0.2 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::f816:3eff:fe2d:906d prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:2d:90:6d txqueuelen 0 (Ethernet)
RX packets 85 bytes 4914 (4.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 1468 (1.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap4a60362f-c1 is unexpected and should not exist here. It looks like that when deleting the subnet, a new tap will be created. I suspect that if all the ip are occupied, there will be no available ip for new tap.
** Affects: neutron
Importance: Undecided
Assignee: OpenCos_gongxf (gong-xiefeng)
Status: Confirmed
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https://bugs.launchpad.net/bugs/1456460
Title:
Garbage DHCP tap exist in the net namespace after deleting one subnet
of a net
Status in OpenStack Neutron (virtual network service):
Confirmed
Bug description:
1 create net and mutiple subnet
#neutron net-create net_test_1
Created a new network:
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | True |
| attached_port_num | 0 |
| bandwidth | 0 |
| id | f2929812-9d56-445b-93ac-a02be1999d27 |
| max_server_num | 50 |
| mtu | 1500 |
| name | net_test_1 |
| provider:network_type | vlan |
| provider:physical_network | physnet1 |
| provider:segmentation_id | 7 |
| shared | False |
| status | ACTIVE |
| subnets | |
| tenant_id | e742cba978bd478caaaa03bc388c373e |
| vlan_transparent | False |
+---------------------------+--------------------------------------+
2 neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.0.0/24
neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.1.0/24
neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.2.0/24
neutron subnet-create f2929812-9d56-445b-93ac-a02be1999d27 20.0.3.0/24
neutron net-list
+--------------------------------------+------------+-----------------------------------------------------+
| id | name | subnets |
+--------------------------------------+------------+-----------------------------------------------------+
| f2929812-9d56-445b-93ac-a02be1999d27 | net_test_1 | 055fd491-7f50-422c-8740-8406c73602d8 20.0.3.0/24 |
| | | 144724d9-c7c4-44d9-a725-64bb7a3091cc 20.0.1.0/24 |
| | | bc9ddb46-d98d-4b2c-9a1e-1ec6babcb1a9 20.0.2.0/24 |
| | | d26d13e4-356f-4602-957b-6ac1ca533506 20.0.0.0/24 |
+--------------------------------------+------------+-----------------------------------------------------+
3 create a port, and boot up vm
#neutron port-create net_test_1 --name port_test_1
#nova boot --flavor m1.small --image e05c4659-2e5b-472d-9eae-01bc6564e8f3 --nic port-id=40306a52-cc4e-45ad-a5a6-8c11468c8d68 vm_test_1
nova list
+--------------------------------------+-----------+--------+------------+-------------+---------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-----------+--------+------------+-------------+---------------------+
| 53c54d5e-2fc8-4315-9903-316fedb81936 | vm_test_1 | BUILD | spawning | NOSTATE | net_test_1=20.0.3.2 |
+--------------------------------------+-----------+--------+------------+-------------+---------------------+
4 query DHCP tap of the net namespace
#ip netns
qdhcp-f2929812-9d56-445b-93ac-a02be1999d27
# ip netns exec qdhcp-f2929812-9d56-445b-93ac-a02be1999d27 ifconfig -a
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 3 bytes 1180 (1.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3 bytes 1180 (1.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap4a60362f-c1: flags=67<UP,BROADCAST,RUNNING> mtu 1500
inet 20.0.0.2 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::f816:3eff:fe2d:906d prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:2d:90:6d txqueuelen 0 (Ethernet)
RX packets 38 bytes 2760 (2.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 1468 (1.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
5 delete one unused subnet
# neutron subnet-delete bc9ddb46-d98d-4b2c-9a1e-1ec6babcb1a9
Deleted subnet: bc9ddb46-d98d-4b2c-9a1e-1ec6babcb1a9
# neutron net-list
+--------------------------------------+------------+-----------------------------------------------------+
| id | name | subnets |
+--------------------------------------+------------+-----------------------------------------------------+
| f2929812-9d56-445b-93ac-a02be1999d27 | net_test_1 | 055fd491-7f50-422c-8740-8406c73602d8 20.0.3.0/24 |
| | | 144724d9-c7c4-44d9-a725-64bb7a3091cc 20.0.1.0/24 |
| | | d26d13e4-356f-4602-957b-6ac1ca533506 20.0.0.0/24 |
+--------------------------------------+------------+-----------------------------------------------------+
6 query DHCP tap of the net namepace
#ip netns exec qdhcp-f2929812-9d56-445b-93ac-a02be1999d27 ifconfig -a
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 7 bytes 1504 (1.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 1504 (1.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap03466191-47: flags=67<UP,BROADCAST,RUNNING> mtu 1500
inet 20.0.0.3 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::f816:3eff:fe06:6360 prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:06:63:60 txqueuelen 0 (Ethernet)
RX packets 10 bytes 420 (420.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9 bytes 738 (738.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap4a60362f-c1: flags=67<UP,BROADCAST,RUNNING> mtu 1500
inet 20.0.0.2 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::f816:3eff:fe2d:906d prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:2d:90:6d txqueuelen 0 (Ethernet)
RX packets 85 bytes 4914 (4.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 1468 (1.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tap4a60362f-c1 is unexpected and should not exist here. It looks like that when deleting the subnet, a new tap will be created. I suspect that if all the ip are occupied, there will be no available ip for new tap.
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