Lesson 02 · 11 min
Docker and the Dockerfile
An image is a snapshot of the app with its environment. A container is a running image.
An image contains the OS, the right Node version, dependencies, and your code. A container is a running instance of an image, isolated from others. A Dockerfile is the recipe for building the image step by step. Each step is a layer, and Docker reuses unchanged layers from cache.
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