What is Docker?
Definition
An open-source platform that automates the deployment, scaling, and management of applications by packaging them into lightweight, portable, and self-sufficient executable units called containers.
Explain Like I'm New
The 'It works on my machine' solver. Docker allows a developer to package their code, along with every single library, setting, and dependency it needs, into a single box. You can hand that box to any other computer in the world, and it will run exactly the same way.
Real World Example
A Node.js developer builds an app on a Mac using Node v14. The production server uses Linux and Node v18. Normally, the app would crash. With Docker, the developer puts the app AND a miniature version of Linux AND Node v14 inside a box. The production server runs the box perfectly without changing its own settings.
Common Use Cases
- •Consistent development environments
- •Microservices architecture
- •Simplified cloud deployment
Interview Questions
basic
- What is the primary problem that Docker was created to solve?
intermediate
- Is Docker an operating system?