Image vs container vs Dockerfile?
Understand the concept
A Docker image packages a filesystem and configuration for starting an application. A container is an isolated process environment created from an image with a writable layer and runtime settings. A Dockerfile describes how the image is built, making the package reproducible rather than depending on manual server setup.
Important ideas
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An image is the packaged filesystem and configuration for an app.
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A container is an instance of that image; it may be running or stopped.
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A Dockerfile describes image build steps; containers share the host kernel.
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Containers share the host kernel; they are not full virtual machines with independent kernels.
Can you explain it without the notes?
Image vs container vs Dockerfile?
Use your own words. Explain an example and one limitation before checking the explanation.
Check your explanation
A Docker image packages a filesystem and configuration for starting an application. A container is an isolated process environment created from an image with a writable layer and runtime settings. A Dockerfile describes how the image is built, making the package reproducible rather than depending on manual server setup.
Turn this concept into a clear answer.
- Distinguish build-time content from runtime configuration and persisted application data.
Adapted from 09_TESTING_GIT_DOCKER_CLOUD.md · “Image vs container vs Dockerfile?”. Examples are study fragments; framework behavior can depend on your version.