What is Docker Swarm Leader and about the IP used by the trainer in the session?

Question

What is the docker swarm leader? Not what is the IP that the trainer is using 3.13.160.200, where did he get from docker swarm init --advertise-addr=3.13.160.200

Answer 1

IP address is basically the address of your instance on which you need to create docker swarm master
IP, you can get it from your EC2 instance in your AWS Management console. Check the screenshot below: