cloudinit/net/sysconfig.py does not parse network_data.json correctly

[Lars Kellogg-Stedman]

In cloudinit/net/sysconfig.py, we see:

            elif len(iface_subnets) > 1:
                for i, iface_subnet in enumerate(iface_subnets,
                                                 start=len(iface.children)):
                    iface_sub_cfg = iface_cfg.copy()
                    iface_sub_cfg.name = "%s:%s" % (iface_name, i)
                    iface.children.append(iface_sub_cfg)
                    cls._render_subnet(iface_sub_cfg, route_cfg, iface_subnet)

The code 'start=len(iface.children)' fails because at this point, iface is simply a dict, and has no 'children' attribute.

[Lars Kellogg-Stedman (larsks)]

I am working on a fix in https://code.launchpad.net/~larsks/cloud-init/+git/cloud-init/+ref/lp/1665441. That branch right now will run without errors but the resulting config file appears to be missing an ip address.

[Lars Kellogg-Stedman (larsks)]

I've gone ahead and proposed the fix for merging. It results in interface config files that are correct but that will only work with legacy (pre-NetworkManager) networking until https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=a8f0d88596d8dd2b807a7b0adee272c4f077dade reaches centos/rhel/etc packaging.

[Scott Moser (smoser)]

This bug is believed to be fixed in cloud-init in 17.1. If this is still a problem for you, please make a comment and set the state back to New

Thank you.

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/2808