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[Bug 1597609] Re: Single Vm instance assigned with two ips

 

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

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

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https://bugs.launchpad.net/bugs/1597609

Title:
  Single Vm instance assigned with two ips

Status in OpenStack Compute (nova):
  Expired

Bug description:
  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

  
  Expected Result:
  ---------------
  Each vm instance should be assigned with one ip.

  Actual Result:
  --------------
  A vm instance assigned with two ips.

  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.

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References