Can I automatically add a new host to known_hosts?

Here's my situation: I'm setting up a test harness that will, from a central client, launch a number of virtual machine instances and then execute commands on them via ssh. The virtual machines will have previously unused hostnames and IP addresses, so they won't be in the ~/.ssh/known_hosts file on the central client. The problem I'm having is that the first ssh command run against a new virtual

[n0ts]

ssh-keyscan -H することで手動で known_hosts に登録できるのか

[Hash]

StrictHostKeyChecking=no を入れると確認を出さない. gitコマンドの場合-> http://debuggable.com/posts/disable-strict-host-checking-for-git-clone:49896ff3-0ac0-4263-9703-1eae4834cda3