cloudinit fails with duplicate mac address on tunnel interfaces

[Kirill Ma]

Cloudinit fails with duplicate mac address while trying to read mac addresses for tunnel interfaces.
Tunnel interfaces copying mac from main interface, so it will definitely have duplicate macs.

There are different types of tunnels in linux kernel, based on https://github.com/torvalds/linux/blob/9e9fb7655ed585da8f468e29221f0ba194a5f613/include/uapi/linux/if_arp.h#L67 they have types '768', '769', '776', '777'.

Should cloudinit skip those interfaces?

I have a patch for https://github.com/canonical/cloud-init/blob/main/cloudinit/net/__init__.py. If it will help.

[James Falcon (falcojr)]

This appears to be a use case we have missed. Can you run "cloud-init collect-logs" on an affected instance and attach them here so we can get a sense of how and where things are failing?

A contribution is certainly welcome. Our contribution process is outlined at https://cloudinit.readthedocs.io/en/latest/topics/contributing.html

At the very least you would need to sign the CLA, or we will not be able to accept the patch.

[Kirill Ma (mashkir)]

Hello, I signed CLA, is there anything else I could help with?

[James Falcon (falcojr)]

Kirill,

Thanks for signing the CLA. Can you also run "cloud-init collect-logs" on an affected instance and attach the resulting tarball here so we can get a sense of how and where things are failing?

[Launchpad Janitor (janitor)]

[Expired for cloud-init because there has been no activity for 60 days.]

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3966