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Docker Architecture

Docker consists of several key components that together form its architecture. Below is a description of these components and how they work together to enable the creation, running, and management of containers.

Docker Architecture Components​

  1. Docker Daemon (Dockerd)
  2. Docker Client (CLI)
  3. Docker Images
  4. Docker Containers
  5. Docker Registry
  6. Docker Network

How Docker Works​

  1. Creating an Image
  • The user creates a Dockerfile, which contains a set of instructions for building an image.
  • The Docker Client uses the docker build command to send instructions to the Docker Daemon.
  • The Docker Daemon processes the Dockerfile and builds the image by creating layers.
  1. Running a Container
  • The user runs a container using the docker run command.
  • The Docker Client sends a request to the Docker Daemon.
  • The Docker Daemon creates an instance of the image and runs the container.
  1. Managing Networks
  • Docker creates networks that allow containers to communicate with each other and with external networks.
  • The network type can be specified when creating a container, e.g., bridge, host, overlay.
  1. Storing and Retrieving Images
  • Images are stored in a Docker registry (e.g., Docker Hub).
  • Users can push images to the registry and pull images from the registry.

The diagram below illustrates Docker's architecture and how the individual components interact:

+--------------------+         +-----------------+
|  Docker CLI        |  --->   |  Docker Daemon  |
+--------------------+         +-----------------+
      |                           |
      v                           v
+--------------------+         +-----------------+
|  Docker Registry   |  <-->   |  Docker Images  |
+--------------------+         +-----------------+
                                    |
                                    v
                           +-----------------+
                           |  Docker Container|
                           +-----------------+
                           +-----------------+
                           |  Docker Network  |
                           +-----------------+

Docker provides an efficient, portable, and isolated environment for running applications, simplifying the management of the application lifecycle from development to production.