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[Bug 1603918] Re: The port's dns_name is cleared while the instance boot failed, because the port's dns_name is not equal to the instance's hostname

 

This is not a bug. This is the expected behavior according to the spec.
Please point 1 here: http://specs.openstack.org/openstack/nova-
specs/specs/mitaka/implemented/internal-dns-resolution.html#proposed-
change

If you have a valid use case for this, I invite you to submit a RFE
following this process:
http://docs.openstack.org/developer/neutron/policies/blueprints.html
#neutron-request-for-feature-enhancements

** Changed in: neutron
       Status: New => Opinion

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https://bugs.launchpad.net/bugs/1603918

Title:
  The port's dns_name is cleared while the instance boot failed,because
  the port's dns_name is not equal to the instance's hostname

Status in neutron:
  Opinion

Bug description:
  In Mitaka,
  The value assigned to the dns_name attribute of the port is not equal to the value that Compute service will assign to the instance’s hostname, 
  the instance boot will fail,however,the port's dns_name is cleared
  Repetition steps are as follows:
  step 1:Create a port specifying 'my-port' to its dns_name attribute
  step 2:Boot an instance using the port,the hostname assigned to the instance is not equal to the port's dns_name
  step 3:The boot failed
  step 4:Show the port info created in step1 using neutron port-show command,the dns_name is cleared.
   
  [root@devstack218 devstack]# neutron port-update port2_net1 --dns-name my-port
  Updated port: port2_net1
  [root@devstack218 devstack]# neutron port-show port2_net1
  +-----------------------+----------------------------------------------------------------------------------------------------------------+
  | Field                 | Value                                                                                                          |
  +-----------------------+----------------------------------------------------------------------------------------------------------------+
  | admin_state_up        | True                                                                                                           |
  | allowed_address_pairs |                                                                                                                |
  | binding:host_id       |                                                                                                                |
  | binding:profile       | {}                                                                                                             |
  | binding:vif_details   | {}                                                                                                             |
  | binding:vif_type      | unbound                                                                                                        |
  | binding:vnic_type     | normal                                                                                                         |
  | created_at            | 2016-07-12T08:40:47                                                                                            |
  | description           |                                                                                                                |
  | device_id             |                                                                                                                |
  | device_owner          |                                                                                                                |
  | dns_assignment        | {"hostname": "my-port", "ip_address": "198.51.100.12", "fqdn": "my-port.example.org."}                         |
  |                       | {"hostname": "my-port", "ip_address": "2001:db8:80d2:c4d3:f816:3eff:fe44:f8d", "fqdn": "my-port.example.org."} |
  | dns_name              | my-port                                                                                                        |
  | extra_dhcp_opts       |                                                                                                                |
  | fixed_ips             | {"subnet_id": "481cadf6-fa52-4739-80b2-331a3b90d7b6", "ip_address": "198.51.100.12"}                           |
  |                       | {"subnet_id": "60f56f75-ce94-498f-b4ad-0383db2796a8", "ip_address": "2001:db8:80d2:c4d3:f816:3eff:fe44:f8d"}   |
  | id                    | aa89b945-1806-4384-9771-25c44bf7f66d                                                                           |
  | mac_address           | fa:16:3e:44:0f:8d                                                                                              |
  | name                  | port2_net1                                                                                                     |
  | network_id            | d885e8ed-5e70-478f-a279-fd6c00bbb2d7                                                                           |
  | port_security_enabled | True                                                                                                           |
  | qos_policy_id         | 2e7b351c-5579-4d34-9617-f7e95acbb56b                                                                           |
  | security_groups       | e5bd8e12-ea85-4801-acd2-a997df98053d                                                                           |
  | status                | DOWN                                                                                                           |
  | tenant_id             | d9cc08fe87ee49f08020baa95893e2ef                                                                               |
  | updated_at            | 2016-07-18T08:43:52                                                                                            |
  +-----------------------+----------------------------------------------------------------------------------------------------------------+
  [root@devstack218 neutron]# nova boot --flavor cgslv5 --image 940b2997-4dc0-4163-a7c2-c4836f25f709 --nic port-id=aa89b945-1806-4384-9771-25c44bf7f66d  my-vm
  +--------------------------------------+------------------------------------------------------------------+
  | Property                             | Value                                                            |
  +--------------------------------------+------------------------------------------------------------------+
  | OS-DCF:diskConfig                    | MANUAL                                                           |
  | OS-EXT-AZ:availability_zone          |                                                                  |
  | OS-EXT-SRV-ATTR:host                 | -                                                                |
  | OS-EXT-SRV-ATTR:hostname             | my-vm                                                            |
  | OS-EXT-SRV-ATTR:hypervisor_hostname  | -                                                                |
  | OS-EXT-SRV-ATTR:instance_name        | instance-0000001e                                                |
  | OS-EXT-SRV-ATTR:kernel_id            |                                                                  |
  | OS-EXT-SRV-ATTR:launch_index         | 0                                                                |
  | OS-EXT-SRV-ATTR:ramdisk_id           |                                                                  |
  | OS-EXT-SRV-ATTR:reservation_id       | r-y6jorkya                                                       |
  | OS-EXT-SRV-ATTR:root_device_name     | -                                                                |
  | OS-EXT-SRV-ATTR:user_data            | -                                                                |
  | OS-EXT-STS:power_state               | 0                                                                |
  | OS-EXT-STS:task_state                | scheduling                                                       |
  | OS-EXT-STS:vm_state                  | building                                                         |
  | OS-SRV-USG:launched_at               | -                                                                |
  | OS-SRV-USG:terminated_at             | -                                                                |
  | accessIPv4                           |                                                                  |
  | accessIPv6                           |                                                                  |
  | adminPass                            | MXuk5hDSrgmS                                                     |
  | config_drive                         |                                                                  |
  | created                              | 2016-07-18T08:44:12Z                                             |
  | description                          | -                                                                |
  | flavor                               | cgslv5 (12345)                                                   |
  | hostId                               |                                                                  |
  | host_status                          |                                                                  |
  | id                                   | 2eb5e7a3-3d39-4919-a0f6-48deaa55bf2c                             |
  | image                                | cgslv5_iperf_macvtap_bond (940b2997-4dc0-4163-a7c2-c4836f25f709) |
  | key_name                             | -                                                                |
  | locked                               | False                                                            |
  | metadata                             | {}                                                               |
  | name                                 | my-vm                                                            |
  | os-extended-volumes:volumes_attached | []                                                               |
  | progress                             | 0                                                                |
  | security_groups                      | default                                                          |
  | status                               | BUILD                                                            |
  | tags                                 | []                                                               |
  | tenant_id                            | d9cc08fe87ee49f08020baa95893e2ef                                 |
  | updated                              | 2016-07-18T08:44:13Z                                             |
  | user_id                              | 57ceaf0e698541d09ac09d676ee8838c                                 |
  +--------------------------------------+------------------------------------------------------------------+
  [root@devstack218 neutron]# nova list

  +--------------------------------------+------------------------+--------+------------+-------------+----------------------------------------------------------------+
  | ID                                   | Name                   | Status | Task State | Power State | Networks                                                       |
  +--------------------------------------+------------------------+--------+------------+-------------+----------------------------------------------------------------+
  | 2eb5e7a3-3d39-4919-a0f6-48deaa55bf2c | my-vm                  | ERROR  | -          | NOSTATE     |  
  [root@devstack218 devstack]# neutron port-show port2_net1
  +-----------------------+--------------------------------------------------------------------------------------------------------------------------+
  | Field                 | Value                                                                                                                    |
  +-----------------------+--------------------------------------------------------------------------------------------------------------------------+
  | admin_state_up        | True                                                                                                                     |
  | allowed_address_pairs |                                                                                                                          |
  | binding:host_id       |                                                                                                                          |
  | binding:profile       | {}                                                                                                                       |
  | binding:vif_details   | {}                                                                                                                       |
  | binding:vif_type      | unbound                                                                                                                  |
  | binding:vnic_type     | normal                                                                                                                   |
  | created_at            | 2016-07-12T08:40:47                                                                                                      |
  | description           |                                                                                                                          |
  | device_id             |                                                                                                                          |
  | device_owner          |                                                                                                                          |
  | dns_assignment        | {"hostname": "host-198-51-100-12", "ip_address": "198.51.100.12", "fqdn": "host-198-51-100-12.example.org."}             |
  |                       | {"hostname": "host-2001-db8-80d2-c4d3-f816-3eff-fe44-f8d", "ip_address": "2001:db8:80d2:c4d3:f816:3eff:fe44:f8d",        |
  |                       | "fqdn": "host-2001-db8-80d2-c4d3-f816-3eff-fe44-f8d.example.org."}                                                       |
  | dns_name              |                                                                                                                          |
  | extra_dhcp_opts       |                                                                                                                          |
  | fixed_ips             | {"subnet_id": "481cadf6-fa52-4739-80b2-331a3b90d7b6", "ip_address": "198.51.100.12"}                                     |
  |                       | {"subnet_id": "60f56f75-ce94-498f-b4ad-0383db2796a8", "ip_address": "2001:db8:80d2:c4d3:f816:3eff:fe44:f8d"}             |
  | id                    | aa89b945-1806-4384-9771-25c44bf7f66d                                                                                     |
  | mac_address           | fa:16:3e:44:0f:8d                                                                                                        |
  | name                  | port2_net1                                                                                                               |
  | network_id            | d885e8ed-5e70-478f-a279-fd6c00bbb2d7                                                                                     |
  | port_security_enabled | True                                                                                                                     |
  | qos_policy_id         | 2e7b351c-5579-4d34-9617-f7e95acbb56b                                                                                     |
  | security_groups       | e5bd8e12-ea85-4801-acd2-a997df98053d                                                                                     |
  | status                | DOWN                                                                                                                     |
  | tenant_id             | d9cc08fe87ee49f08020baa95893e2ef                                                                                         |
  | updated_at            | 2016-07-18T08:44:18                                                                                                      |
  +-----------------------+--------------------------------------------------------------------------------------------------------------------------+
  [root@devstack218 devstack]#

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