docker-dind

Dev

Updated 10 hours ago

Docker-DIND Overview

Secure your stack with a hardened Docker-DIND 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.

Docker-in-Docker (DinD) is a technique for running Docker containers inside another Docker container. DinD is commonly used in containerized CI workflows.

Try It Out

Take the Minimus Docker-DIND image for a test run:

Step 1: Start the DIND container

docker run -d \
  --privileged \
  -p 2376:2376 \
  reg.mini.dev/docker-dind

The --privileged flag is required for the Docker daemon to run inside another container. Mapping port 2376 exposes the Docker API.

Step 2: Copy the certificates

Copy server certificate docker cp YOUR_CONTAINER_ID:/certs/server/ca.pem ./dind-certs/server-ca.pem

Copy client certificates docker cp sad_northcutt:/certs/ ./dind-certs/

Step 3: Test you docker-dind

Now you can test your docker-dind container with the following commands:

Check docker version:

curl --cacert ./dind-certs/server-ca.pem \
  --cert ./dind-certs/client/cert.pem \
  --key ./dind-certs/client/key.pem \
  https://localhost:2376/version

Pull docker image:

curl -X POST --cacert ./dind-certs/server-ca.pem \
  --cert ./dind-certs/client/cert.pem \
  --key ./dind-certs/client/key.pem \
  "https://localhost:2376/images/create?fromImage=reg.mini.dev/docker-dind&tag=latest"

List the image you just downloaded:

curl --cacert ./dind-certs/server-ca.pem \
  --cert ./dind-certs/client/cert.pem \
  --key ./dind-certs/client/key.pem \
  https://localhost:2376/images/json

Technical Considerations

The Docker-DIND 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.

Docker-DIND built by Minimus:

Runs as root to support required functions. The public image also runs as root.
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.