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The following topics are common design themes for containerized applications: The remainder of this guide details each of these choices so network engineers can understand what might be best for their environments.ĭocker has developed a new way of delivering applications, and with that, containers have also changed some aspects of how we approach networking. Each option provides different benefits and tradeoffs. Docker Datacenter and the Docker ecosystem provides multiple tools to network engineers to achieve the best balance for their applications and environments. Like any design, network design is a balancing act. It aims to provide options and flexibility to the network operators as well as the right level of abstraction to the application developers.

The Docker networking philosophy is application driven. Microservices practices have increased the scale of applications which has put even more importance on the methods of connectivity and isolation that we provide to applications.

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It does not specify or recommend physical network design but provides options for how to design Docker networks while considering the constraints of the application and the physical network.Ĭhallenges of Networking Containers and Microservices What if the applications need to communicate with each other, the host, or an external network? How do you design a network to allow for proper connectivity while maintaining application portability, service discovery, load balancing, security, performance, and scalability? This document addresses these network design challenges as well as the tools available and common deployment patterns.

By default, containers isolate applications from one another and the underlying infrastructure, while providing an added layer of protection for the application.

This guarantees that the software will always run the same, regardless of its environment. Docker containers wrap a piece of software in a complete filesystem that contains everything needed to run: code, runtime, system tools, system libraries – anything that can be installed on a server.