Welcome to the Docker Tutorials, In these tutorials, we will cover Docker feature, Architecture, installation, commands, and many more. Apart from the tutorials, we will also cover Interview Questions, Issues, and How To's of Docker.

Docker

Docker is “an open-source project to pack, ship, and run any application as a lightweight container.” The idea is to provide a comprehensive abstraction layer that allows developers to “containerize” or “package” any application and have it run on any infrastructure.

The use of container here refers more to the consistent, standard packaging of applications rather than referring to any underlying technology (a distinction that will be important in a moment)

Docker, represented by a logo with a friendly-looking whale, is an open-source project that facilitates the deployment of applications inside of software containers. Its basic functionality is enabled by resource isolation features of the Linux kernel, but it provides a user-friendly API on top of it.

The first version was released in 2013, and it has since become extremely popular and is being widely used by many big players such as eBay, Spotify, Baidu, and more. In the last funding round, Docker has landed a huge $95 million.

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Docker Architecture

Docker uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. Both the Docker client and the daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. 2 Docker is an open platform for developing, shipping, and running applications. Docker helps you ship code faster, test faster, deploy faster and shorten the cycle between writing code and running code. Docker does this by combining kernel containerization features with workflows and tooling that help you manage and deploy your applications. With Docker, you can separate your applications from your infrastructure and treat your infrastructure like a managed application. Docker provides a way to run almost any application securely isolated in a container. The isolation and security allow you to run many containers simultaneously on your host. The lightweight nature of containers, which run without the extra load of a hypervisor, means you can get more out of your hardware.

 

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How does a Docker image work?

Docker images are built from these base images using a simple, descriptive set of steps we call instructions. Each instruction creates a new layer in our image. Instructions include actions like:

  • Run a command
  • Add a file or directory
  • Create an environment variable
  • What process to run when launching a container from this image

These instructions are stored in a file called a Dockerfile. A Dockerfile is a text-based script that contains instructions and commands for building the image from the base image. Docker reads this Dockerfilewhen you request a build of an image, executes the instructions, and return a final image.

Docker Advantages:

-Speed -Lightweight -Isolation -Automation -Portability -Migration 3  

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