Complete procedures with a way back.

Ansible Missing sudo password and Host key verification failed are separate trust-boundary failures that can appear in the same run. Host key verification happens before remote login and protects the server identity; SSH authentication proves the automation identity; become authentication authorizes privilege escalation after login. This Guide separates those layers, starts with read-only evidence, verifies changed host keys out of band, and restores interactive or noninteractive become without disabling security controls.