+ - setup SSH keys:
+ - On the central machine, generate an authentication key using ssh-keygen.
+ Since this is for unattended operation, use a blank passphrase.
+ - Append the newly-created identity.pub file to ~root/.ssh/authorized_keys
+ on the remote machine(s).
+ - Some new SSH v2 implementation accept v2 style keys only. Use the -t
+ option to ssh-keygen, and append the created id_dsa.pub or id_rsa.pub to
+ ~root/.ssh/authorized_keys2 on the remote machine(s).
+ - You may need to set PermitRootLogin without-password (meaning with keys
+ only) in your sshd_config file on the remote machine(s).