What Is Docker DNS Server?


Angela Bailey

Docker DNS Server is an essential component of the Docker ecosystem that plays a crucial role in ensuring seamless communication between containers and the outside world. In this article, we will explore what Docker DNS Server is and how it works.

What is Docker DNS Server?

Docker DNS Server, also known as the Docker Domain Name System, is a built-in DNS server provided by Docker. It acts as a lightweight resolver for container networking by automatically assigning unique domain names to each container within a Docker network. This enables containers to communicate with each other using their container names instead of relying on IP addresses.

How does it work?

The Docker DNS Server works by assigning a unique domain name to each container within a network. When a container is created, it is automatically given a hostname that matches its container name. For example, if you have a container named “webserver”, its hostname will be “webserver”.

To enable communication between containers, Docker sets up an internal DNS service that resolves these hostnames to their respective IP addresses within the network. This allows containers to seamlessly communicate with each other using their assigned hostnames.

Benefits of using Docker DNS Server

  • Simplified Container Communication: With Docker DNS Server, you can communicate between containers using intuitive and memorable hostnames instead of dealing with complex IP addresses.
  • Dynamic Network Configuration: As containers are created or destroyed, the DNS server automatically updates its records, ensuring accurate and up-to-date name resolution.
  • Scalability: The Docker DNS Server scales effortlessly as your application grows. It can handle thousands of containers without sacrificing performance or introducing additional complexity.
  • Multinetwork Support: Docker DNS Server supports multiple networks, allowing containers in different networks to communicate with each other using their respective hostnames.

Using Docker DNS Server in Practice

When running containers within a Docker network, you can simply refer to other containers using their assigned hostnames. For example, if you have a web server container named “webserver” and a database container named “database”, the web server can communicate with the database by simply using the hostname “database”.

Docker DNS Server eliminates the need to hardcode IP addresses or manage complicated networking configurations. It simplifies the process of connecting and communicating between containers, making it easier to build and maintain containerized applications.


Docker DNS Server is an essential component of Docker networking that provides seamless communication between containers using assigned hostnames. By eliminating the need for manual IP address management, Docker DNS Server simplifies container communication and enhances scalability. With its dynamic network configuration and multinetwork support, it is a powerful tool for building and managing robust containerized applications.

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