What is the role of the Docker daemon?

The role of the Docker daemon is pivotal in the functioning of Docker as it serves as the core software component responsible for managing Docker containers and images. This includes creating, running, and stopping containers based on user commands or orchestrating environments in response to specific events. The daemon handles all the operations related to containerization, allowing users to build, ship, and run applications efficiently across various environments.

When a user interacts with Docker through the command-line interface or any Docker client, those commands are sent to the Docker daemon for execution. The daemon communicates with the Docker registry to pull images or push images as needed and manages the life cycle of containers by allocating system resources effectively.

Other options do not capture the primary function of the Docker daemon. For instance, while file storage is essential in containerized applications, the daemon itself is not a storage service. Monitoring network traffic typically involves other tools or services tailored for that specific function. Similarly, while user interfaces may convey commands to the Docker daemon, executing commands on user interfaces does not accurately reflect the core responsibilities of the daemon. The focus on managing containers and images highlights the central role the daemon plays in the Docker architecture.