neil@nj-ubuntu:~$ juju ssh etcd/0
Warning: Permanently added '54.172.153.97' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 16.04 LTS (GNU/Linux 4.4.0-21-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

0 packages can be updated.
0 updates are security updates.


*** System restart required ***

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.

ubuntu@ip-172-31-56-224:~$ sudo ss -tnlp
State      Recv-Q Send-Q                                                             Local Address:Port                                                                            Peer Address:Port
LISTEN     0      128                                                                            *:22                                                                                         *:*                   users:(("sshd",pid=1025,fd=3))
LISTEN     0      128                                                                172.31.56.224:7001                                                                                       *:*                   users:(("etcd",pid=21935,fd=5))
LISTEN     0      128                                                                172.31.56.224:4001                                                                                       *:*                   users:(("etcd",pid=21935,fd=7))
LISTEN     0      128                                                                    127.0.0.1:4001                                                                                       *:*                   users:(("etcd",pid=21935,fd=6))
LISTEN     0      128                                                                           :::22                                                                                        :::*                   users:(("sshd",pid=1025,fd=4))
ubuntu@ip-172-31-56-224:~$ curl http://172.31.56.224:4001/version
{"etcdserver":"2.2.5","etcdcluster":"2.2.0"}ubuntu@ip-172-31-56-224:~$
ubuntu@ip-172-31-56-224:~$ curl https://172.31.56.224:4001/version
curl: (35) gnutls_handshake() failed: An unexpected TLS packet was received.
ubuntu@ip-172-31-56-224:~$ etcdctl ls /
ubuntu@ip-172-31-56-224:~$