40 Days Of Kubernetes (1/40)

Day 1/40

Docker Tutorial For Beginners - Docker Fundamentals

Docker Architecture

Components:

1. Client: The interface through which a user interacts with Docker. Commands like docker build, docker push, docker pull, and docker run are issued from here.

2. Docker Host: The machine where Docker is installed. It hosts the Docker Daemon, images, and containers.

3. Docker Daemon (dockerd): The background service that manages Docker objects (such as images, containers, networks, and volumes) and listens for Docker API requests.

4. Dockerfile: A text file that contains instructions to build a Docker image. It includes steps like installing software, copying files, and setting up the environment.

5. Docker Registry: A storage and distribution system for Docker images. Docker Hub is the default registry, but private registries can also be used.

6. Docker Image: A lightweight, standalone, and executable package that includes everything needed to run a piece of software, including the code, a runtime, libraries, and settings.

7. Docker Container: A runnable instance of a Docker image. Containers are isolated environments that share the OS kernel but are otherwise independent.

Workflow Steps:

1. docker build (Step 1): The client sends a docker build command to the Docker Daemon. The Docker Daemon reads the Dockerfile (Step 2) to create a Docker Image (Step 3).

2. Docker Daemon processes Dockerfile (Step 2): The Dockerfile is read by the Docker Daemon, which executes the instructions to build an image.

3. Docker Image Creation (Step 3): Once the Dockerfile is processed, a Docker Image is created.

4. docker push (Step 4): The client sends a docker push command to the Docker Daemon, instructing it to push the Docker Image to a Docker Registry (Step 5).

5. Docker Registry (Step 5): The Docker Image is stored in the Docker Registry, making it available for others to pull and use.

6. docker pull (Step 6): The client sends a docker pull command to the Docker Daemon, which pulls the Docker Image from the Docker Registry to the Docker Host.

7. docker run (Step 7): The client issues a docker run command, and the Docker Daemon creates a Docker Container (Step 9) from the Docker Image.

8. Docker Container Creation (Step 9): The Docker Daemon uses the Docker Image to create a Docker Container, which is then executed.