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This article introduces the knowledge of "how to view the network environment of docker container". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

When docker run creates a Docker container, you can use the-net option to specify the network mode of the container, and Docker has four single-node network modes.

Bridge mode

The Docker container uses bridge mode networks by default. In this mode, Docker Container does not have a public IP, because the IP address of the host is not in the same network segment as the IP address of veth pair. Docker uses NAT to "bind" the port monitored by the service inside the container to a port port of the host, so that the world outside the host can actively send network messages to the inside of the container.

Host mode

The Host pattern does not create an isolated network environment for the container. It is called host mode because the Docker container in this mode will share the same network namespace with the host host. If you start the container in host mode, the container will not get a separate Network Namespace, but will share a Network Namespace with the host. The container will not virtualize its own network card or configure its own IP, but will use the IP and port of the host.

Container mode

Container network mode is a special network mode in Docker. Docker containers in this mode share the network environment of other containers, so at least there is no network isolation between the two containers, and the two containers are isolated from the host and other containers.

This mode specifies that the newly created container and an existing container share a Network Namespace rather than with the host. Instead of creating its own Nic and configuring its own IP, the newly created container shares IP, port range, and so on with a specified container. Similarly, apart from the network, the two containers are isolated, such as file systems, process lists, and so on. The processes of the two containers can communicate through the lo network card device.

None mode

The network mode is none, that is, no network environment is constructed for the Docker container. Once the Docker container adopts none network mode, only loopback network devices can be used inside the container, and there will be no other network resources. Docker Container's none network mode means that no network environment is created for the container, and the container can only use 127.0.0.1 native network.

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