Docker for Beginners: A Practical Guide

Dec 05, 2022

What Is a Docker?

  1. Let’s Say you created an application, and that’s working fine in your machine.???????

Figure 1: App Working Fine


  1. But in production it doesn’t work properly, developers experience it a lot.

Figure 2: Not Working in Production


  1. That is when the developer’s famous words are spoken

Client: Your application is not working

Developer: It works on my machine

Figure 3: Client Developer


  1. The Reason could be due to:
    1. Dependencies
    2. Libraries and versions
    3. Framework
    4. OS Level features
    5. Microservices

That the developer’s machine has but not there in the production environment.


  1. We need a standardized way to package the application with its dependencies and deploy it on any environment.

Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.

Figure 4: Docker Icon


How does docker work?

  1. Docker packages an application and all its dependencies in a virtual container that can run on any server.

    Figure 5: Container

  2. Each container runs as an isolated process in the user space and take up less space than regular VMs due to their layered architecture.

    Figure 6: Architecture

  3. So, it will always work the same regardless of its environment.

Credit Goes to @codechips


Hardik Dangar

About the Author

Hardik Dangar

Project Lead in Magnusminds

Hardik is working as Project Lead of MSBI in INDIA. Hardik started his career working on SQL Server and MSBI. Hardik is having 5+ years of experience. In the starting of his career he was working on SQL Server, SSIS and SSRS. Hardik likes to explore technical things on SQL Server.