While using the known_hosts Ansible module, I stumbled upon the error
message that gives name to this blog post. All I could find was
this GitHub issue which unfortunately didn’t help me much.
I wasn’t hashing the hostname (hash_host: false), and the key had
a valid format (as per the section SSH_KNOWN_HOSTS FILE FORMAT in the
sshd(8) man page).
My problem was that I was dealing with an ssh server that listened on
a port other than 22. The documentation for the known_host module says:
For custom SSH port, name needs to specify port as well. See example section.
And the format is a bit special. Example:
- name: Add public key
known_hosts:
name: "[{{ my_host }}]:{{ my_custom_port }}"
key: "{{ lookup('pipe', 'ssh-keyscan -p {{ my_custom_port }} {{ my_host }}') }}"
Notice the square brackets around the hostname.
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