Question 1

How to use Dive to reduce Docker image size?

Accepted Answer

Run 'dive <your-image>' to inspect layers, identify large or duplicated files, and adjust your Dockerfile—like combining RUN commands or removing temporary files—based on the efficiency score and wasted space highlights.

Question 2

Dive vs Docker history command?

Accepted Answer

Dive offers an interactive UI with detailed file tree changes and efficiency metrics, while 'docker history' only shows layer commands and sizes. Dive is better for deep optimization, but Docker history is quicker for basic checks.

Question 3

How to integrate Dive into GitHub Actions?

Accepted Answer

Add a step in your workflow to install Dive via package manager, then run 'CI=true dive <image>' with a .dive-ci config file to enforce size rules. The README provides CI examples for automated pass/fail results.

Question 4

What does the Dive efficiency score mean?

Accepted Answer

It's an experimental metric estimating wasted space from duplicated or unnecessary files across layers, expressed as a percentage. Higher scores indicate better optimization, but the README notes it's a guess, not a precise measurement.

Question 5

Can Dive analyze images from private registries?

Accepted Answer

Yes, if your Docker or Podman engine can pull the image, Dive can analyze it by using the same authentication. For Docker archives, save the image locally first, then use the docker-archive source option.

Question 6

Dive or Skopeo for image inspection?

Accepted Answer

Dive excels at layer-by-layer optimization with a visual terminal UI, while Skopeo focuses on copying and verifying images across registries. Use Dive for size reduction; Skopeo for registry operations.

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