`register` with `with_items` not working as expected

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1

Hi guys! I’m new to Ansible, and I’m working on my first playbook. I have something like this:

  • name: known_hosts | keyscan

command: “ssh-keyscan -H {{ item }}”

with_items: known_hosts

register: known_hosts_keys

  • name: known_hosts | update

lineinfile: “dest=~/.ssh/known_hosts regexp=‘{{ item }}’ line=‘{{ item }}’ create=yes”

with_items: known_hosts_keys

known_hosts is a variable defined like this:

known_hosts:

This is the output I’m getting:

TASK: [known_hosts | keyscan] *************************************************

changed: [default] => (item=github.com)

TASK: [known_hosts | update] **************************************************

fatal: [default] => with_items expects a list

FATAL: all hosts have already failed – aborting

It seems that the $known_hosts_keys variable is not being registered properly. Am I missing something?

Thanks!

2

A register when used with a “with_items” will reproduce a datastructure differently than you would expect

known_host_keys.results is the list of all responses

{
failed: True, # is failed
changed: True/False,
results: [ result1, result2 ]
}

etc