Error: FATAL: 1 node found, but does not have the required attribute to establish the connection. Try setting another attribute to open the connection using –attribute.
You need to set the –attribute to have the *name* of the cloud attribute. In AWS case most likely you would be looking for this: “ipaddress”.
So your knife ssh command would look like –
knife ssh <name> -x <user> “sudo chef-client” -a ipaddress