These days I’m playing a bit with 5 Raspberries 2B (4 cores and 1 GB of RAM) in order to build a Docker cluster. There are different options: Docker Swarm over Consul/Etcd/Zookeper, Kubernetes by Google, etc. I just want to share some interesting commands for working with remote machines that have helped me to build such a cluster: ssh-copy-id, nmap and csshx.