[NETVIRT-37] Single Vm Instance Assigned With two ips

Fri, 9 Mar 2018 18:21:30 +0000

While testing Netvirt 1 node openstack in csit, I could see two ips assigned to a single vm instance.

Steps to be followed to reproduce:

1. Create Network
2. Create subnet
3. Boot three vm instances in the same subnet

Observation:

first two vm instances properly assigned with ips (vm1 as 30.0.0.3 and vm2 as 30.0.0.4), where as the third vm instance assigned with two ips as (30.0.0.5
and 3.0.0.6) since the subnet range is 30.0.0.0/24 and Gateway is enabled.

after creating all three vm instances i printed them with nova show commands.
i could see the below output for third vm instance.

----------------------------------------------------------------------------------------------------+

Property

Value

----------------------------------------------------------------------------------------------------+

OS-DCF:diskConfig	MANUAL
OS-EXT-AZ:availability_zone	nova
OS-EXT-SRV-ATTR:host	centos7-devstack-721
OS-EXT-SRV-ATTR:hostname	mythirdinstance-1
OS-EXT-SRV-ATTR:hypervisor_hostname	centos7-devstack-721
OS-EXT-SRV-ATTR:instance_name	instance-00000003
OS-EXT-SRV-ATTR:kernel_id	55ce53be-9fd0-4df7-ab55-5e78a296376c
OS-EXT-SRV-ATTR:launch_index	0
OS-EXT-SRV-ATTR:ramdisk_id	179666d0-e4f4-4a9b-bbf3-3e8f23fd5488
OS-EXT-SRV-ATTR:reservation_id	r-k85fjf88
OS-EXT-SRV-ATTR:root_device_name	/dev/vda
OS-EXT-SRV-ATTR:user_data
OS-EXT-STS:power_state	1
OS-EXT-STS:task_state
OS-EXT-STS:vm_state	active
OS-SRV-USG:launched_at	2016-06-28T07:10:10.000000
OS-SRV-USG:terminated_at
accessIPv4
accessIPv6
config_drive	True
created	2016-06-28T07:10:05Z
description
flavor	m1.nano (42)
hostId	f7c621bc0d8cb4621e5a33dc1fdf12b1fd0adcfd96abc51eaf7c6e62
host_status	UP
id	f7d294d6-9b23-40f5-9151-1d7a1f8168e8
image	cirros-0.3.4-x86_64-uec (05d7928d-4221-4e7f-ad27-f9d0bcf3a742)
key_name
l2_network_1 network	30.0.0.5, 30.0.0.6
locked	False
metadata	{}
name	MyThirdInstance_1
os-extended-volumes:volumes_attached	[]
progress	0
security_groups	default
status	ACTIVE
tenant_id	d99ecfb314dd4731ab47d73ccb5e6c9e
updated	2016-06-28T07:10:10Z
user_id	7f36ff94d6194308b647e720382b1f33

----------------------------------------------------------------------------------------------------+
[jenkins@centos7-devstack-9113 devstack]>

when i check the ifconfig for the particular vm i could see the second ip (30.0.0.6) assigned to it.

where as in dump flows there are entries for both the ips.
as below:

cookie=0x0, duration=16.270s, table=20, n_packets=0, n_bytes=0, priority=1024,arp,tun_id=0x43f,arp_tpa=30.0.0.6,arp_op=1 actions=move:NXM_OF_ETH_SRC[]~~>NXM_OF_ETH_DST[],set_field:fa:16:3e:b6:13:3e~~>eth_src,load:0x2->NXM_OF_ARP_OP[],move:NXM_NX_ARP_SHA[]~~>NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]~~>NXM_OF_ARP_TPA[],load:0xfa163eb6133e->NXM_NX_ARP_SHA[],load:0x1e000006->NXM_OF_ARP_SPA[],IN_PORT

cookie=0x0, duration=16.252s, table=20, n_packets=0, n_bytes=0, priority=1024,arp,tun_id=0x43f,arp_tpa=30.0.0.5,arp_op=1 actions=move:NXM_OF_ETH_SRC[]~~>NXM_OF_ETH_DST[],set_field:fa:16:3e:5b:6a:6f~~>eth_src,load:0x2->NXM_OF_ARP_OP[],move:NXM_NX_ARP_SHA[]~~>NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]~~>NXM_OF_ARP_TPA[],load:0xfa163e5b6a6f->NXM_NX_ARP_SHA[],load:0x1e000005->NXM_OF_ARP_SPA[],IN_PORT

Please find the sandbox link for more details:
https://jenkins.opendaylight.org/sandbox/job/netvirt-csit-1node-openstack-mitaka-openstack-beryllium/11/

Attached the logs for reference, kindly let us know if any more details required.

OpenDaylight JIRA

[NETVIRT-37] Single Vm Instance Assigned With two ips