Docker runs a separate Docker host (small footprint Linux VM) on Mac which is different from main machine. So any port which maps to container to host machine, cannot be accessed by
localhost. Instead it has to use docker host is.
Here is how you can get docker host ip on Mac
## docker-machine ip vm_name $ docker-machine ip default
To get names of all docker machines, you can use
docker-machine ls NAME ACTIVE URL STATE URL SWARM DOCKER ERRORS default * virtualbox Running tcp://192.168.99.100:2376 v1.9.1