Gen SSH key
ssh-keygen -t rsa -b 4096 -C "your_email@example.com" -f $HOME/.ssh/id_rsa
https://superuser.com/questions/1004254/how-can-i-change-the-directory-that-ssh-keygen-outputs-to
ssh-keygen -f "/root/.ssh/known_hosts" -R "192.168.101.42"