Comment 2 for bug 1850310

Thanks for filing the bug.

Cloud-init itself does not render /etc/resolv.conf on Ubuntu/Debian; In Ubuntu, the resolvconf package is installed which handles maintain /etc/resolv.conf.

Looking at:

https://cdimage.debian.org/cdimage/openstack/current-10/debian-10-openstack-amd64-packages.list

resolvconf package is not present, hence the bug. I would suggest that the images include this package.

That said, cloud-init could detect if resolvconf is not present and render resolv.conf directly.