What does docker dns not specify IP mean?

Docker is an open source containerization platform that provides a convenient and fast solution to build, publish and run applications. Docker's success is largely due to its flexibility and scalability, as it runs on a variety of operating systems and can be developed using a variety of languages ​​and tools. Docker is also increasingly used, especially in cloud computing environments.

As a container platform, a necessary component is the container network. Docker can use a variety of network drivers to manage communication between containers. Among them, the most commonly used network drivers are bridge network and host network.

The bridge network requires Docker to assign a unique IP address to each container, which means that the network configuration of each container needs to be managed and coordinated, and an independent IP address needs to be allocated on the Docker host. net. This approach brings inconvenience and complexity to situations where horizontal expansion and dynamic deployment of containers are required. On the other hand, the host network allows the container to directly use the network on the host, but this method has security issues because the container can directly access all network resources on the host, which may lead to security risks.

In order to solve this situation, Docker provides a more flexible and secure solution - DNS does not specify IP. It requires using Docker's built-in DNS server to resolve container names into IP addresses so that containers can communicate with each other without having to worry about IP addresses. At the same time, DNS does not specify an IP and has the following advantages:

1. Simple and easy to use: Using DNS without specifying an IP, we do not need to manage the IP address of the container, but only need to use the container name to communicate. This makes container deployment and management easier.
2. High security: DNS does not specify an IP to isolate the container's network traffic on the host. In this way, network traffic between containers will not be passed from the host, thus protecting the security of the containers at the network level.
3. Network scalability: For scenarios where containers need to be deployed in a distributed environment, DNS without specifying IP can provide dynamic network configuration between containers. This way we can scale the application easily and deploy containers freely.

In general, when using Docker, we should choose different network drivers based on the characteristics and needs of the application. For scenarios that require flexible and efficient management of container networks, DNS without specifying IP is a very good choice.

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