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How to learn Docker from scratch

Are you keen to dive into the world of containerization? Docker has revolutionized the software industry, and understanding it is essential for budding developers and IT professionals. In this article, we'll walk you through the essentials of Docker, its transformative benefits, and a roadmap to help you master this pivotal skill.

1) What is Docker?

Docker is a platform designed to make it easier to create, deploy, and run applications using containers. These containers allow developers to package an app with all parts it requires, such as libraries and other dependencies, and ship it all out as one package. It ensures that the application will run seamlessly, regardless of the environment in which it’s running.

2) Why Should You Start Learning Docker?

Understanding Docker is pivotal for several reasons:

  • Portability: With Docker containers, applications become highly portable. This ensures that they can run on any machine that supports Docker, irrespective of any differences that machine may have.
  • Efficiency: Docker containers are lightweight, meaning they don’t carry the overhead of full virtual machines, leading to resource savings.
  • Scalability: Using Docker, applications can be easily scaled up or down, offering incredible flexibility.
  • Consistency: Docker ensures that applications run the same, regardless of where they’re deployed.


3) Job Opportunities with Docker Mastery

When you master Docker, doors to a plethora of job opportunities open.

A) Docker Administrator: Oversee and manage Docker installations


  • Installing, configuring, and maintaining Docker engines across various platforms.
  • Monitoring Docker container instances to ensure optimal performance and resource usage.
  • Collaborating with development teams to streamline Docker practices, ensuring secure and efficient container orchestration.
  • Managing Docker images, keeping them updated, and ensuring a consistent and clutter-free image registry.

Benefits of Hiring:

  • With a Docker Administrator on board, organizations can ensure that their Docker infrastructure remains robust, updated, and free from vulnerabilities.
  • The role is pivotal in preventing container sprawl and ensuring that resources are used efficiently.

B) DevOps Engineer: Specializing in integrating Docker into continuous integration pipelines


  • Designing, testing, and maintaining continuous integration and continuous deployment (CI/CD) pipelines leveraging Docker.
  • Automating processes, integrating Docker with other DevOps tools like Jenkins, GitLab CI, and Kubernetes.
  • Troubleshooting deployment issues related to Docker containers and working closely with development teams to resolve them.

Benefits of Hiring:

  • DevOps Engineers with Docker specialization can bridge the gap between development and operations, ensuring faster and smoother software releases.
  • Their expertise aids in building scalable and repeatable deployment processes, crucial for agile development.

C) Infrastructure Engineer: Designing systems and infrastructure around containerized applications


  • Designing and building infrastructure that supports Docker container deployment at scale.
  • Evaluating system requirements and hardware to ensure it supports the containerized applications efficiently.
  • Collaborating with both system administrators and developers to create a seamless environment for deploying and running containerized solutions.

Benefits of Hiring:

  • These engineers bring a blend of systems knowledge and Docker expertise, ensuring the infrastructure can support the complexities of modern, containerized applications.
  • They play a crucial role in ensuring system resilience, scalability, and overall performance.

D) Cloud Engineer: Leveraging Docker for efficient cloud deployments


  • Integrating Docker with cloud platforms like AWS, Google Cloud, and Azure to optimize container deployments.
  • Architecting cloud solutions that take full advantage of Docker’s capabilities, such as AWS’s Elastic Container Service (ECS) or Kubernetes on Google Cloud.
  • Ensuring that Dockerized applications in the cloud are secure, scalable, and resilient to failures.

Benefits of Hiring:

  • With Docker’s rise in popularity, many cloud services have integrated Docker capabilities. A Cloud Engineer with Docker expertise ensures that organizations can maximize these capabilities for better ROI on their cloud investments.
  • They also bring the added advantage of understanding the intricacies of cloud platforms, ensuring Dockerized applications are optimized for the cloud environment.

4) How Long Does It Take to Learn Docker?

Typically, if you have a grounding in software development or IT, you can grasp the basics of Docker within a couple of weeks. However, mastery might take longer, contingent on the complexities you explore and the practical experience you gain.


5) How to Start Learning Docker?

Eager to embark on your Docker journey? Dive into our free course on start.lewagon.com:

Intro to Docker

learning docker with our course

What you will learn

  • Docker Fundamentals: Delve deep into Docker’s essence. Understand containerization’s underlying principles, laying a concrete foundation for your Docker journey.
  • Dockerfile & Docker Image Creation: Containers revolve around Docker images. Master the art of crafting Dockerfiles and creating Docker images for efficient container management.
  • Commands in Docker Containers: It’s not just about creation; it’s about control. Grasp the nuances of running commands within Docker containers, enhancing your prowess over them.
  • Real-World Applications: Knowledge meets application. Engage in practical challenges, understand Docker’s applicability, and hone your skills in tangible scenarios.


6) How is Docker Compared to Other Technical Skills?

Docker, in essence, stands in a league of its own. However, comparing it to other technical skills:

  1. Usability: Docker is straightforward to use, especially when juxtaposed with the complexities of managing full-fledged virtual machines.
  2. Learning Curve: While Docker has its intricacies, it’s generally considered easier to pick up than some other deep technical skills, especially given its vast community and plethora of resources.
  3. Versatility: Docker’s containerization approach allows developers to create consistent environments across development, testing, and production stages. This unified environment ensures reduced compatibility issues compared to traditional methods.
  4. Integration & Ecosystem: Docker seamlessly integrates with various popular tools like Kubernetes, Jenkins, and more, enhancing its utility. Few other technical skills offer such a broad spectrum of integration opportunities with modern development tools.
  5. Cost Efficiency: When compared to traditional virtualization methods, Docker containers are more resource-efficient. They allow multiple containers to run on the same machine without the overhead of running multiple OS instances, leading to cost savings in infrastructure.



Docker’s prevalence in modern tech infrastructure is undeniable. As the world shifts towards containerized applications, understanding Docker isn’t just a recommendation; it’s a necessity. With the resources at your disposal, especially courses like the one we offer, embarking on your Docker learning journey has never been easier. Dive in, explore, and let Docker’s world of containerization unfold before you.

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