Chainguard Container for glibc-dynamic

Base image with just enough to run arbitrary glibc binaries.

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/glibc-dynamic: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 meant to be used as just a base image only. It does not contain any programs that can be run, other than /sbin/ldconfig. Unlike Chainguard's standard glibc container image, the glibc-dynamic image also includes libstdc++, the GNU C++ standard library implementation.

You must bring your own artifacts to use this image, e.g. with a Docker multi-stage build. If you want locale support other than C.UTF-8, you must bring your own locale data as well. This may change in the future based on user feedback.

Getting Started

To illustrate how you can use Chainguard's glibc-dynamic container image, start by creating the following Go program:

cat > main.go <<EOF
package main

import (
	"fmt"
	"net/http"
)

func main() {
	http.Get("http://www.google.com")
	fmt.Println("Hello, world!")
}
EOF

This is a Hello, world! program, but it includes the line http.Get("http://www.google.com") which will require glibc.

Next, create a Dockerfile that uses the Chainguard glibc-dynamic container as a base image:

cat > Dockerfile <<EOF
FROM cgr.dev/chainguard/go AS builder
ADD main.go .
RUN CGO_ENABLED=1 go build -o /tmp/foo main.go

# Use this image as a base image.
FROM cgr.dev/chainguard/glibc-dynamic
COPY --from=builder /tmp/foo /foo
ENTRYPOINT ["/foo"]
EOF

Using this Dockerfile, build an image:

docker build -t glibc-dynamic-example .

Then run the newly-built image:

docker run --rm glibc-dynamic-example

This will return the following output, indicating the program was run successfully and the glibc-dynamic base image worked as expected:

Hello, world!

Documentation and Resources

• glibc Project Website
• Chainguard Academy: glibc vs. musl

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.