Docker

What is Docker?

Docker is an open-source platform that automates the deployment of applications inside lightweight, portable containers. Containers package an application with all its dependencies, ensuring consistent behavior across environments.

Docker Concepts

• Image: Read-only template containing application and dependencies
• Container: Running instance of an image
• Dockerfile: Script defining how to build an image
• Registry: Repository for storing and distributing images
• Docker Hub: Public registry for Docker images

Docker Benefits

Consistency across environments, isolation between applications, efficient resource usage, fast startup times, and simplified deployment workflows.

Common Misconceptions

• "Docker is a VM" - Containers share the host OS kernel
• "Docker is inherently secure" - Requires security configuration
• "One container per application" - One process per container is best practice