Docker 101: How I Mastered Docker Build Processes In One Night

Docker Competencies: Part 1/3 (BASIC)

From "I've heard of it" to "I can ship it"

Task 1: Create a Multi-Stage Build

• Write a Dockerfile for an app that uses a heavy build image (like node:latest) to install dependencies, but then copies only the necessary production files into a slim runtime image (like node:alpine).


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  The Goal: Compare the final image sizes.


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  Task 2: The "Bridge Network" Handshake

  
  
  
  
  
  • Deploy two containers: an API container (e.g., Flask/Express) and a UI container (Nginx-based).
  
  
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    The Goal: Create a custom Docker network and ensure the containers can communicate using the container name as the hostname, rather than a hardcoded IP.
  
  
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    Key Concept: Containers should talk via names, not unstable IP addresses.
  
  
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    Task 3: "Legacy to Linux" Migration

    
    
    
    
    
    • Take a basic HTML/JS frontend that runs locally and containerize it using Nginx.
    
    
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      The Goal: Inject an environment variable into the container to change the background color of the UI.
    
    
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      Optimization: Use a .dockerignore file to ensure node_modules or local logs aren't accidentally copied into the image.
    
    
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      Resource:
      
      
      

      Task 4: Master Container Lifecycle Commands

      
      
      

      Execute the following sequence to master the CLI:

      
      
      
      
      
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        Detached Mode: Run a Redis container in the background: docker run --name my-cache -d redis.
      
      
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        Port Mapping: Map port 6379 of the container to 7000 on your host.
      
      
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        Restart Policy: Run a container with --restart unless-stopped and manually restart your Docker Desktop/Daemon to see if it recovers.
      
      
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        Auto-Cleanup: Run a temporary "Hello World" container with the --rm flag to ensure it deletes itself after execution.
      
      
      
      
      
      
      

      Task 6: Cross-Platform .NET Deployment

      
      
      
      
      
      1. Create a standard .NET 8 (or 6/7) Web API.
      
      
      2. Build it using a Linux-based SDK image.
      
      
      3. Switch Docker Desktop to "Windows Container" mode and build using Windows Server Core or Nano Server.
         
      
      
      
      
      

      The Goal: Observe the difference in startup time and image size between native Windows and Linux-based containers.

      
      
      

      

      
      
      
      
      
      

      🛠️ Pro-Tips: Working in Neovim
      
      If you live in the terminal, you can manage Docker without leaving your editor.

      
      
      

      Plugin Support:

      
      
      

      nvim-docker: Provides a UI to list, start, stop, and delete containers (use r for restart, t for logs).

      
      
      

      denops-docker.vim: Manage images/containers and search Docker Hub directly from Neovim.

      
      
      

      devops-tools.nvim: Adds handy commands like :DockerPs and :DockerImages.

      
      
      

      LSP & Syntax:

      
      
      

      Install the *Docker Language Server *(via Mason) for autocompletion, linting, and hover documentation.

      
      
      

      Terminal Integration: Open a terminal inside a split (:term) to run Docker commands while editing your Dockerfile.

      
      
      

      Lazy Management: Use lazydocker (a TUI for Docker) and toggle it inside Neovim using toggleterm.nvim.

      
      
      

      Advanced Note: For Task 6, you can even install Neovim inside your dev container. Tools like** DevPod or nvim-remote-containers **allow you to edit files directly inside a running Docker environment.

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