4. 4 Host Natively, each container runs isolated from the outside world A bridge network (an internal, virtual switch) is provided with Docker but does not allow containerized processes to communicate together without further config (see next slides) Isolation by design Container ‘app’ Bridge docker0 Container ‘db’ Tomcat (port 8080) MySQL (port 3306) 5. 5 Exposing ports allows containers services
![Docker networking basics & coupling with Software Defined Networks](https://cdn-ak-scissors.b.st-hatena.com/image/square/fd34aeca110b970d70a093827b4f9dbd57fe3e21/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Fmeetupdocker-usingsoftwaredefinednetworks-140319025937-phpapp02-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)