Create more users than the image default on instance creation
#cloud-config
users:
- default
- name: username
gecos: Full Name Here
groups: sudo
ssh_authorized_keys:
- ssh-ed25519 <key> <comment>
- ssh-rsa <key> <comment>
- ...
If you don't include the "default" entry first in the users-block, the default user for the given image will NOT be created. Therefore: keep it. Full documentation on this, here
Add additional SSH keys to the default user
#cloud-config
ssh_authorized_keys:
- ssh-rsa <key> <comment>
- ssh-ed25519 <key> <comment>