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While the container has access to all of the host’s network interfaces, unless deployed in privilege mode, the container may not reconfigure the host’s network stack. In this approach, a newly created container shares its network namespace with the host, providing higher performance - near metal speed - and eliminating the need for NAT however, it does suffer port conflicts. While bridged networks solve port-conflict problems and provide network isolation to containers running on one host, there’s a performance cost related to using NAT. NAT is used to provide communication beyond the host.
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Both the rkt and Docker container projects provide similar behavior when None or Null networking is used. It does, however, receive a loopback interface. None is straightforward in that the container receives a network stack, but lacks an external network interface. In this post we will learn briefly about various networking modes available for Docker containers and deep dive into Host Mode networking. This is not only important from the perspective of service communication but also forms an important aspect of infrastructure security. It is essential for us to understand how container networking works.
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This lets you build a “hub” of sorts to connect to multiple networks and separate concerns. A container with attachments to multiple networks can connect with all of the containers on all of those networks. Containers can communicate within networks but not across networks. You can create multiple networks with Docker and add containers to one or more networks. This enables a container to attach to your host’s network (meaning the configuration inside the container matches the configuration outside the container).
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This container only has a local loopback interface (i.e., no external network interface). This offers a container-specific network stack that lacks a network interface. It’s better to define your own networks instead. Just because you can use them, does not mean you should. However, these error-prone techniques require unnecessary complexity. The Docker bridge supports port mappings and docker run -link allowing communications between containers on the docker0 network. You must connect containers with the -link option in your docker run command. Docker does not support automatic service discovery on bridge. If you have containers running on your network, docker network inspect displays networking information for your containers.Īny containers on the same network may communicate with one another via IP addresses. Docker automatically creates a subnet and gateway for the bridge network, and docker run automatically adds containers to it.