As an update, I didn't realize originally but it seems I need to both the new VM once before the password reset option will work. If I go directly to it on first boot I get a message about no config.boot file and this not being a restore tool. Booting normally once seems to create the default config, then the password recovery option works from the serial interface.

Proxmox images don't use any default passwords.
You use this flavour incorrectly.

What is the intended way to apply configuration to a newly created proxmox flavor instance? At the page I referenced, it doesn't give any indication how to login or add a configuration under the "deploy from qcow2" section. Under the deploy from rolling release, it does mention the normal default vyos/vyos credentials.

Is there documentation somewhere else that I'm missing, or do I need to dig around in the github repos to try to figure out how this flavor is intended to be configured? I'm a little puzzled by this response, that I'm using it incorrectly. Is there direction somewhere on how to use it correctly?

Thank you.

If you use the official proxmox image, you have to use cloud-init to set login/pass for the proxmox flavors.
Feel free to improve the documentation.
Thanks.

Thank you. I see my mistake now. When I read under step 3, "Optionally, the user can attach a CDROM with an ISO as a cloud-init data source", it left me with the impression this was *optional*—that skipping this would not cause problems. I didn't realize that it would mean no default username/password would be set.

Adding "Skipping this step means no default config will exist, and you'll need to boot once normally, then again a second time and go into password recovery to set a password for the vyos account." would have save the confusion on my part, but probably isn't worthwhile as most people likely wouldn't be so silly as to skip cloud-init when it is available.

Sorry for the noise!