Several modes of docker network

With the development and widespread application of container technology, Docker has become one of the most popular container technologies currently, and Docker network is one of the key components to realize container interconnection. In order to better understand Docker network, this article introduces several modes of Docker network.

1. Bridge mode

Bridge mode is one of the most commonly used network modes of Docker. It creates a virtual network device named docker0 on the Docker host and assigns it to each container. A unique IP address allows direct communication between containers.

In addition, in bridge mode, Docker will assign a unique MAC address to each container by default for ARP protocol-related work. This means that different containers can communicate with each other via MAC addresses, not just IP addresses.

2. Host mode

Different from bridge mode, in Host mode the container and the host share the same network namespace. In other words, the container can directly use the network configuration on the host. This Enables applications on containers to take advantage of features such as network proxies, routing, and firewalls on the host.

Therefore, the advantage of Host mode is better performance because it does not involve any network address translation and additional network layers. However, the disadvantage of Host mode is that the network isolation between containers is poor and it is easily vulnerable to attacks on other containers and hosts.

3. None mode

None mode is the simplest Docker network mode, because in this mode the container is not connected to any network interface. This pattern is typically used in standalone container situations, such as batch jobs or self-contained local applications.

Specifically, in None mode the container has no network interface and network configuration, so all network traffic cannot be transmitted between the container and the external network. In this case, the container can only communicate with the host by mounting volumes, so this mode is only suitable when the container does not need to interact with the external environment in any way.

4. Overlay mode

Overlay mode is a network mode in docker swarm mode, mainly used for internal communication of container clusters. In this mode Docker will create a shared network on all hosts.

The network in Overlay mode is based on VXLAN technology. Therefore, the same IP can be spanned between different hosts when switching between multiple environments. Network routing and ARP requests are implemented through the Underlay network. Between containers Communication between them is achieved through the Overlay network.

Note that Overlay mode needs to be managed using docker swarm mode, so complexity and performance issues need to be considered.

Summary

This article introduces several modes of Docker network, including bridge mode, Host mode, None mode and Overlay mode. Each mode has its own advantages, disadvantages and applicable scenarios, and you need to choose the appropriate network mode according to the specific situation. During use, you need to pay attention to the correctness and security of network configuration.

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