root@:~# ufw allow 2375/tcp
Rules updated
Rules updated (v6)
root@:~# service dockercloud-agent restart
root@:~# tail /var/log/dockercloud/agent.log
2016/02/18 14:35:04 Waiting for docker unix socket to be ready
2016/02/18 14:35:04 Docker unix socket opened
2016/02/18 14:35:04 Starting docker daemon: [/usr/lib/dockercloud/docker daemon -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375 --userland-proxy=false --tlscert /etc/dockercloud/agent/cert.pem --tlskey /etc/dockercloud/agent/key.pem --tlscacert /etc/dockercloud/agent/ca.pem --tlsverify]
2016/02/18 14:35:04 Docker daemon (PID:18159) has been started
2016/02/18 14:35:04 Node e5c21542-b33a-4c68-8de2-ca39b2396663.node.dockerapp.io is NOT publicly reachable
2016/02/18 14:35:04 Ngrok server: tunnel01.cloud.docker.com:4443
2016/02/18 14:35:04 Starting NAT tunnel
2016/02/18 14:35:05 Found new tunnel: tcp://tunnel01.cloud.docker.com:43287
2016/02/18 14:35:05 Sending tunnel address to Docker Cloud
2016/02/18 14:35:05 New tunnel has been set up