hosts based open ssh authentication

[Bhasker C V <bhasker@unixindia.com>]

Hi all

 I have a system in a cluster (experimental) and there are a lot of
debian machines which depend on this system and must be able to ssh into
this system

I wanted password-less authentication and looked on the internet.
Almost all the examples and help shown involves setting up
ssh_known_hosts which I am trying to avoid (cumbersome in a large
network where we dont know who will need access).

Anyone got this working just plain without adding known hosts ? I do not
want to add each and every host to ssh_known_host. Essentially I want to
have an open access to one of the servers via ssh.

I tried running sshd as root and adding

auth sufficient pam_rootok.so

to pam ssh and login
but that did not help.

Thanks

Bhasker C V