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[James Falcon <2008772@xxxxxxxxxxxxxxxxxx>]

This is expected behavior. On Ubuntu 18.04, on Openstack, the network
was configured using the fallback network interface only. In Ubuntu
20.04, it was updated to use network_data.json. Since changing this
behavior would have resulted in backwards incompatibly, it is not
default behavior on 18.04.

To enable this behavior on 18.04, you can add the following to
/etc/cloud/cloud.cfg or a file in /etc/cloud/cloud.cfg.d/

datasource:
  OpenStack:
    apply_network_config: true

Since this is expected behavior, I'm going to set this bug status to
Invalid, but if I have missed something, please do set it back to New
and add more context.

See the following links for context:
https://bugs.launchpad.net/cloud-init/+bug/1749717
https://github.com/canonical/cloud-init/commit/cd1de5f47ab6b82f2c6fd61a5f6681f33b3e5705
https://github.com/canonical/cloud-init/blob/ubuntu/bionic/debian/patches/openstack-no-network-config.patch/

** Changed in: cloud-init
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2008772

Title:
  Ubuntu 18.04 wrong parsing of instance-data.json generating network
  config

Status in cloud-init:
  Invalid

Bug description:
  Hello,

  We have an cloud service based on Openstack, we have provide IPv4 (dhcp) and IPv6 (static),
  on ubuntu 18.04 we detected that when is parsed instance-data.json it take info only for IPv4 and not get static records for IPv6. And related to this it not generate config for IPv6 we tested with netplan and ENI (ifupdown), all data in instance-data.json are present in the file.

  2023-02-28 09:21:42,649 - util.py[DEBUG]: Reading from /sys/class/net/ens3/type (quiet=False)
  2023-02-28 09:21:42,650 - util.py[DEBUG]: Read 2 bytes from /sys/class/net/ens3/type
  2023-02-28 09:21:42,650 - networking.py[DEBUG]: net: all expected physical devices present
  2023-02-28 09:21:42,650 - stages.py[DEBUG]: applying net config names for {'ethernets': {'ens3': {'dhcp4': True, 'set-name': 'ens3', 'match': {'macaddress': 'fa:16:3e:00:3c:33'}}}, 'version': 2}
  2023-02-28 09:21:42,650 - util.py[DEBUG]: Reading from /sys/class/net/ens3/device/device (quiet=False)
  2023-02-28 09:21:42,650 - util.py[DEBUG]: Read 7 bytes from /sys/class/net/ens3/device/device

  On ubuntu 20.04 this problem not persist.
  2023-02-27 14:36:40,755 - util.py[DEBUG]: Reading from /sys/class/net/lo/type (quiet=False)
  2023-02-27 14:36:40,755 - util.py[DEBUG]: Read 4 bytes from /sys/class/net/lo/type
  2023-02-27 14:36:40,755 - networking.py[DEBUG]: net: all expected physical devices present
  2023-02-27 14:36:40,755 - stages.py[DEBUG]: applying net config names for {'version': 1, 'config': [{'type': 'physical', 'mtu': 1500, 'accept-ra': False, 'subnets': [{'type': 'dhcp4'}, {'type': 'static6', 'netmask': 'ffff:ffff:ffff:ffff::', 'routes': [{'network': '::', 'netmask': '::', 'gateway': '2a10:c941:12:1::1'}], 'address': '2a10:c941:12:1::10f', 'ipv6': True}], 'mac_address': 'fa:16:3e:f3:d9:ad', 'name': 'ens3'}, {'type': 'nameserver', 'address': '8.8.8.8'}, {'type': 'nameserver', 'address': '1.1.1.1'}]}
  2023-02-27 14:36:40,756 - util.py[DEBUG]: Reading from /sys/class/net/ens3/device/device (quiet=False)
  2023-02-27 14:36:40,756 - util.py[DEBUG]: Read 7 bytes from /sys/class/net/ens3/device/device

  
  cloud-init version: 22.4.2-0ubuntu0~18.04.1

  we tried and older version but it work same

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