dive

Utils

Updated 4 days ago

Dive Overview

Secure your stack with a hardened Dive image freshly-built by Minimus. Minimus images always include the most up-to-date package version for all packages and dependencies contained in the image.

Dive is a CLI tool that explores a Docker/OCI image layer by layer, calculating an efficiency score and estimating wasted space to help shrink image size and catch bloated builds in CI pipelines.

Try It Out

Dive reads images from your local Docker engine, so pull an image to analyze first, for example, the Minimus nginx-FIPS image:

docker pull reg.mini.dev/nginx-fips:latest

Mount the Docker socket so Dive can access it, then analyze the image:

docker run --rm -it \
  -v /var/run/docker.sock:/var/run/docker.sock \
  reg.mini.dev/dive reg.mini.dev/nginx-fips:latest

The interactive viewer will open in the terminal, for example:

...
Image name: reg.mini.dev/nginx-fips
Total Image size: 66 MB                 
Potential wasted space: 52 kB      
Image efficiency score: 99 %                           │

Enforce an efficiency threshold

To enforce Dive's default efficiency thresholds in a CI pipeline, set the CI environment variable:

docker run --rm -e CI=true \
  -v /var/run/docker.sock:/var/run/docker.sock \
  reg.mini.dev/dive reg.mini.dev/nginx-fips:latest

To modify the thresholds, add the --lowestEfficiency, --highestWastedBytes, and --highestUserWastedPercent flags, for example:

docker run --rm -e CI=true \
  -v /var/run/docker.sock:/var/run/docker.sock \
  reg.mini.dev/dive reg.mini.dev/nginx-fips:latest \
  --lowestEfficiency 0.95 --highestWastedBytes 10MB --highestUserWastedPercent 0.05

Save the layer analysis to a file

To save the layer analysis to a file instead of opening the interactive viewer, create a local directory to hold the results:

mkdir -p "$(pwd)/dive_results"

Mount that directory into the container and use the --json flag:

docker run --rm \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v "$(pwd)/dive_results:/output" \
  reg.mini.dev/dive reg.mini.dev/nginx-fips:latest --json /output/dive-report.json

The report is written directly to your host machine at dive_results/dive-report.json.

Technical Considerations

The Dive image provided by Minimus is a slim, security-hardened alternative to the public image from Docker Hub. The images are largely interchangeable, with a few differences as noted below.

Dive built by Minimus:

Runs as root to support required functions in alignment with the public image.
Drill down on the version specification tab to see the default user, listening ports, entrypoint, volumes, environment variables, etc.

The Payoff

A hardened, minimal image that will remain more secure for the long run and accrue vulnerabilities at a slower rate.

See the risk reduction dashboard for a detailed CVE comparison over the past 30 days.
Review the compliance report to see the default hardening and security configurations for the image.

Terms & Info

Trademark

This catalog is published by Minimus. All product names, logos, and marks, other than those belonging to Minimus, shown are owned by their respective rights holders and appear here only to identify the open source software each image contains. Minimus claims no ownership of those marks and implies no affiliation with, endorsement by, certification by, or sponsorship by any rights holder.

Disclaimer

Images are provided "as-is" without warranty of any kind. "Hardened" refers to the security configuration applied at the time of build and does not constitute a guarantee of ongoing security or absence of vulnerabilities. The free tier is provided without support, SLA, or guaranteed patching timelines. Security updates may be applied to paid subscriptions before or instead of free tier images. By pulling or using any image you agree to our Terms of Use.