automating commands on nodes

[Greg Lindahl]

> Although I'll admit I haven't done this, it should be possible to
> configure ssh such that outside connections to the head node are
> encrypted, but connections within the cluster are unencrypted

This is a pain. You have to recompile sshd to allow unencrypted connections.
Then there is no existing policy option to enforce external connections
being encrypted. Gaah.

-- greg