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1_DockerBasics.md

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b ### Understanding Docker: Containerization for Consistent Deployment

  1. Technical Concept

    • Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.
    • Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and deploy it as one package.
    • By doing so, thanks to the container, the developer can rest assured that the application will run on any other Linux machine regardless of any customized settings that machine might have that could differ from the machine used for writing and testing the code.

  2. Curious Questions

    • Q: What exactly is a Docker container? A: A Docker container, at its simplest, is a running instance of a Docker image. The image is a combined set of file system layers that contains everything needed to run your software: code, runtime, system tools, system libraries, etc.
    • Q: How does Docker simplify the development process? A: Docker simplifies the development process by allowing developers to create a predictable and consistent environment that can be shared among development, testing, and production teams, ensuring that there are no discrepancies or manual environment setups.
    • Q: Is Docker platform-dependent? A: Docker is primarily designed for Linux, as it uses various Linux kernel features. However, it can also be used on Windows and Mac systems, where it creates a Linux VM to run the containers.

  3. Simple Explanation

    • Think of Docker as a special kind of packing tool. When you move houses, you pack things into boxes so they can be transported easily. Docker does this for applications, putting all the parts that your software needs into a 'box' (container) so it can run smoothly on any computer.