SRJahirTech

Docker Full Tutorial — Part 3

In this part, we will understand Docker architecture. This is where many beginners get confused — so we will keep it simple and logical.

Main Components of Docker

• Docker Client
• Docker Daemon
• Docker Images
• Docker Containers

Docker Client

Docker Client is what you interact with. Every time you type a Docker command, you are talking to the Docker Client.

docker ps
docker run hello-world
  

The client does not do heavy work. It only sends instructions.

Docker Daemon

Docker Daemon is the brain. It runs in the background and does the actual work.

• Builds images
• Runs containers
• Manages networks and volumes

Docker Image

A Docker image is a blueprint. It is a read-only template used to create containers.

Image contains:

• Base OS layer
• Application code
• Dependencies

Docker Container

A container is a running instance of an image. One image can create many containers.

Simple Flow

1. You run a Docker command
2. Client sends request
3. Daemon processes it
4. Container starts from image

Why This Architecture Matters

Understanding this helps you:

• Debug issues
• Understand errors
• Work confidently in production

In Part 4, we will:

• Install Docker
• Verify installation
• Run first real container