Generate SSH Keys pairs and copy public key to guests the fast way

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What it says on the tin!

 ssh-keygen -t dsa
ssh-copy-id root@iporhostnamehere
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

So simple. Thanks to my colleague Jan for this.