This is an attempt to gather initial ssh_host_key from new vms when they are made.

This avoids having to accept the key manually and allows playbooks making new
instances to complete without human intervention.
(If it works as desired)

tasks/virt_instance_create.yml

@@ -48,3 +48,18 @@
 - name: wait for ssh on the vm to start back
   local_action: wait_for delay=10 host={{ inventory_hostname }} port=22 state=started timeout=1200
   when: inventory_hostname not in result.list_vms
+
+- name: gather ssh host key from new instance
+  local_action: ssh-keyscan -t rsa {{ inventory_hostname }}
+  ignore_errors: True
+  register: hostkey
+  when: inventory_hostname not in result.list_vms
+
+- name: add new ssh host key (you still need to add it to official ssh_host_keys later)
+  local_action: known_hosts path={{item}} key={{ hostkey.stdout }} host={{ inventory_hostname }} state=present
+  ignore_errors: True
+  with_items:
+  - /root/.ssh/known_hosts
+  - /etc/ssh/ssh_known_hosts
+  when: inventory_hostname not in result.list_vms
+