6/6     Where can I find the RSA host key to put in a .ssh/known_hosts (or
        whatever exactly it's called) so I can ssh to csua?

here use mine
|1|42db5+KDy9Hano4lbj/SgFMPKDs=|taKwtpIOjvjZb9S9EIZ+pMbK7pQ= ssh-rsa AAAAB3NzaC1\
yc2EAAAABIwAAAQEA4F3Vgzyef4WlQqLst2xqi+yiRTdg1f4enDPkeT1zSFqhOFNXGoFlKJOGHRmpfwm\
Fxpa0eS6PVtleoI4b5kTbx0C9mA1OFXFVbZNlwjH6Hmife/NZazI4Nhe6Gl7JTNHBliu6VD6KLct66iA\
tZVUhOmM3gmbMfhgIqfbTvtPTLcYGeGHMz+X7dzWPMxMOqoD4iCXIthuLImijbL1HPqX1G65R048MWL1\
eHctxOi+XeFKzvAJ37iez2+prakglPkyAU6jg9luRiPtVQmjD3Q9gp+kenZGKKIK0FiuCuX+avuid5+5\
2psfIl6UWGbXl4VciV5QWZ6AdUmiEsEovZ9DbBQ==