Docker supports creating virtual bridge networks between containers. Remember that a Docker container has many of the features of an installed Linux OS. Each container can have its own IP address(es) and exposed ports. Docker supports creating what amounts to being a virtual Ethernet segment, called a bridge network. These networks live solely within the host computer and, by default, are not reachable by anything outside the host computer.
A Docker bridge network, therefore, has strictly limited access. Any Docker container attached to a bridge network can communicate with other containers attached to that network. The containers find each other by hostname, and Docker includes an embedded DNS server to set up the hostnames ...
