Sometimes, you wish that SSH would just connect without asking questions. For instance if you are on a trusted net where you do not need to worry about man-in-the-middle attacks.
You can realise that wish with the following settings.
Onetime setting as commandline argument:
$ ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no email@example.com Warning: Permanently added '192.168.0.100' (RSA) to the list of known hosts. firstname.lastname@example.org's password:
Permanent in ssh users config ~/.ssh/config
UserKnownHostsFile sets the location of known hosts. In this case, we use /dev/null to make sure there aren’t any existing hosts with offending host keys already present.
StrictHostKeyChecking=no means that ssh will automaticly add the key to the database (/dev/null) without asking for user confirmation.
These 2 steps together mean that ssh will totally ignore any known or unknown host key and just login without silly questions.