What are the four network modes of docker?

Four network modes:

(Recommended tutorial: docker tutorial)

host mode

Container mode

none mode

bridge mode

docker run -it --rm --net=host centos_with_net bash

Use --net=container:container_id/container_name. Multiple containers using the same network will see the same IP.

Use --net=none to specify, no network will be configured in this mode.

Use --net=bridge to specify. If not specified, this network mode will be used by default. This mode assigns an independent Network Namespace to each container. Similar to Vmware's nat network mode. All containers on the same host will be on the same network segment and can communicate with each other.

host mode

If you use host mode when starting a container, the container will not get an independent Network Namespace, but will share a Network with the host. Namespace. The container will not virtualize its own network card, configure its own IP, etc., but use the host's IP and port.

However, other aspects of the container, such as the file system, process list, etc., are still isolated from the host.

container mode

Container mode specifies that the newly created container shares a Network Namespace with an existing container, rather than sharing it with the host. The newly created container will not create its own network card and configure its own IP, but will share the IP, port range, etc. with a specified container.

Similarly, except for the network, the two containers are still isolated from other aspects such as file systems, process lists, etc. The processes of the two containers can communicate through the lo network card device.

none mode

Using none mode, the Docker container has its own Network Namespace, but no network configuration is performed for the Docker container. In other words, this Docker container does not have network card, IP, routing and other information. We need to add network cards, configure IP, etc. to the Docker container ourselves.

bridge mode

Bridge mode is Docker’s default network setting. This mode allocates Network Namespace, sets IP, etc. to each container, and sets the IP address on a host. Docker containers are connected to a virtual bridge.

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