Understanding Docker for Developers

Docker is an open-source platform that uses operating system-level virtualization to deliver software in standardized, lightweight packages called containers.

Released in 2013, it solves the "works on my machine" problem by bundling an application with all its libraries, dependencies, and configurations into a single unit that runs consistently across different computing environments. Core Concepts

• Docker Image: A read-only template containing the application code and everything it needs to run.
• Docker Container: A live, runnable instance of an image. Unlike virtual machines, containers share the host's operating system kernel, making them much faster and more resource-efficient.
• Dockerfile: A text file with instructions used to build a Docker image.
• Docker Hub: A cloud-based registry where users can share and download container images.

Docker simplifies development environments.

docker run -d -p 3000:3000 node:18

⚠️ Note: The -d flag runs containers in detached mode.