How to ignore ansible SSH authenticity checking? RSA key fingerprint

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Do you want to avoid those annoying messages

The authenticity of host 'xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx)' can't be established.
RSA key fingerprint is xx:yy:zz:....
Are you sure you want to continue connecting (yes/no)?

Simply add this to your /etc/ansible/ansible.conf file

host_key_checking = false

Source: How to ignore ansible SSH authenticity checking? – Stack Overflow