In this step we'll create a swarm cluster from two nodes. You should've received access to two nodes in AWS.

1. SSH in to the first node: `ssh -i docker_demo.pem ubuntu@IP1`
2. Figure out the internal IP address of the node: `ifconfig` and check the eth0 address (`10.0....`)
3. Initialize the Swarm cluster: `docker swarm init --listen-addr INTERNAL_IP --advertise-addr INTERNAL_IP
4. Open a new tab and SSH to the other node: `ssh -i docker_demo.pem ubuntu@IP2`
5. Check the internal IP of that node: `ifconfig` and eth0
6. Join to the cluster with the command the previous command printed out. Before executing the command, you need to the extend it with the `--listen-addr` and `--advertise-addr` parameters (using the internal IP of the second node): `docker swarm join TOKEN --listen-addr 10.0.... --advertise-addr 10.0..... node1...`
7. Get back to the first node and verify the results: `docker node ls`