Chainguard Container for rails

Ruby on Rails (often just called "Rails") is a web-application framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/rails:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Compatibility Notes

This image is comparable to the Ruby image available from Docker Hub with the rails gems installed. Switching to the Chainguard image should not require any changes to your existing setup.

Getting Started

Docker

You can run the following command to test Chainguard's Rails image:

docker run --rm cgr.dev/ORGANIZATION/rails:latest rails --version

The following is a minimal example of a Dockerfile that uses a single-stage build to run a Rails application:

FROM cgr.dev/ORGANIZATION/rails:latest

WORKDIR /rails

# This assumes your Dockerfile is in the root directory of your Rails project
COPY . .

RUN bundle install

CMD [ "rails", "server", "-b", "0.0.0.0" ]

This image can be built with:

docker build -t my-new-tag .

You can then run the Rails app with the following command:

$ docker run --rm my-new-tag
=> Booting Puma
=> Rails 8.0.1 application starting in development 
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 6.5.0 ("Sky's Version")
* Ruby version: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +YJIT +PRISM [aarch64-linux-gnu]
*  Min threads: 3
*  Max threads: 3
*  Environment: development
*          PID: 1
* Listening on http://0.0.0.0:3000
Use Ctrl-C to stop

Documentation and Resources

• Official Ruby on Rails Documentation.

What are Chainguard Containers?

Chainguard's free tier of Starter container images are built with Wolfi, our minimal Linux undistro.

All other Chainguard Containers are built with Chainguard OS, Chainguard's minimal Linux operating system designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

• Minimal design, without unnecessary software bloat
• Daily builds to ensure container images are up-to-date with available security patches
• High quality build-time SBOMs attesting to the provenance of all artifacts within the image
• Verifiable signatures provided by Sigstore
• Reproducible builds with Cosign and apko (read more about reproducibility)

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a development, or -dev, variant.

In all other cases, including Chainguard Containers tagged as :latest or with a specific version number, the container images include only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager.

Although the -dev container image variants have similar security features as their more minimal versions, they include additional software that is typically not necessary in production environments. We recommend using multi-stage builds to copy artifacts from the -dev variant into a more minimal production image.

Need additional packages?

To improve security, Chainguard Containers include only essential dependencies. Need more packages? Chainguard customers can use Custom Assembly to add packages, either through the Console, chainctl, or API.

To use Custom Assembly in the Chainguard Console: navigate to the image you'd like to customize in your Organization's list of images, and click on the Customize image button at the top of the page.

Learn More

Refer to our Chainguard Containers documentation on Chainguard Academy. Chainguard also offers VMs and Libraries — contact us for access.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.