network_data.json does not provide information about ipv6 addresses.

[Oleg Gashev]

Environment:

centos 7
openstack liberty

# rpm -qa|grep nova
openstack-nova-api-12.0.0-1.el7.noarch
python-novaclient-2.30.1-1.el7.noarch
openstack-nova-novncproxy-12.0.0-1.el7.noarch
openstack-nova-conductor-12.0.0-1.el7.noarch
python-nova-12.0.0-1.el7.noarch
openstack-nova-console-12.0.0-1.el7.noarch
openstack-nova-common-12.0.0-1.el7.noarch
openstack-nova-compute-12.0.0-1.el7.noarch
openstack-nova-cert-12.0.0-1.el7.noarch
openstack-nova-scheduler-12.0.0-1.el7.noarch

Steps to reproduce:
1) Create network with ipv6 subnet.

# neutron net-list
+--------------------------------------+------+-------------------------------------------------------+
| id | name | subnets |
+--------------------------------------+------+-------------------------------------------------------+
| 286b3e3c-9075-496f-8899-c9890397f087 | net2 | de602f61-8e05-4337-bc9d-c9f8265bb937 1000:2000::/24 |
| a3931414-73c3-40c9-a39b-d93ae38844a2 | net3 | b6ce48ab-9387-4128-baa3-4a893dd27bb7 10.0.2.0/24 |
| a5d1181f-bedd-40a5-8b4a-5574b74dba61 | net1 | 72be780a-6df9-47ea-991c-e6fa97396adc 192.168.122.0/24 |
+--------------------------------------+------+-------------------------------------------------------+

2) Create instance with 3 nic
# nova boot \
 --flavor 2 \
 --image fedora23 \
 --config-drive=True \
 --nic net-id=a5d1181f-bedd-40a5-8b4a-5574b74dba61 \
 --nic net-id=286b3e3c-9075-496f-8899-c9890397f087 \
 --nic net-id=a3931414-73c3-40c9-a39b-d93ae38844a2 \
 --user-data=/root/cloud-config \
 test

# nova list
+--------------------------------------+------+--------+------------+-------------+------------------------------------------------------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+------+--------+------------+-------------+------------------------------------------------------------------+
| 4f159a96-8154-4946-b2a3-50c2638f545b | test | ACTIVE | - | Running | net3=10.0.2.116; net2=1000:2000:3000::1102; net1=192.168.122.117 |
+--------------------------------------+------+--------+------------+-------------+------------------------------------------------------------------+

Logon to instance, mount configDrive:
# mount /dev/disk/by-label/config-2 /mnt/

Actual result:
# cat /mnt/openstack/latest/network_data.json | python3 -m json.tool
{
    "links": [
        {
            "ethernet_mac_address": "fa:16:3e:db:48:10",
            "id": "tap54d10236-5d",
            "mtu": null,
            "type": "ovs",
            "vif_id": "54d10236-5d15-4e22-b584-2a185d74b553"
        },
        {
            "ethernet_mac_address": "fa:16:3e:db:c2:96",
            "id": "tapae9677cb-32",
            "mtu": null,
            "type": "ovs",
            "vif_id": "ae9677cb-327b-4fc9-9b99-88ebd96595a3"
        },
        {
            "ethernet_mac_address": "fa:16:3e:10:37:07",
            "id": "tap1baef501-47",
            "mtu": null,
            "type": "ovs",
            "vif_id": "1baef501-47b0-4c76-928f-34ed2827c7d4"
        }
    ],
    "networks": [
        {
            "id": "network0",
            "link": "tap54d10236-5d",
            "network_id": "a5d1181f-bedd-40a5-8b4a-5574b74dba61",
            "type": "ipv4_dhcp"
        },
        {
            "id": "network1",
            "ip_address": "10.0.2.116",
            "link": "tap1baef501-47",
            "netmask": "255.255.255.0",
            "network_id": "a3931414-73c3-40c9-a39b-d93ae38844a2",
            "routes": [],
            "type": "ipv4"
        }
    ],
    "services": []
}

network_data.json provide information about ipv4 adresses only.

Expected result:

network_data.json provide information about all ip adresses.

[Oleg Gashev (oleg-f)]

Sorry, not a bug.

Fixed by configure nova.conf:

[DEFAULT]
use_ipv6=true

[Denes Nemeth (denes-nemeth)]

In the Ocaka release this option became deprecated. See: https://docs.openstack.org/ocata/config-reference/compute/config-options.html

The proposed solution will not work once the feature is removed.