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docker pull cgr.dev/chainguard/cosign
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Sign InMinimalist Wolfi-based Cosign images for signing and verifying images using Sigstore.
Chainguard Images are regularly-updated, minimal container images with low-to-zero CVEs.
This image is available on cgr.dev
:
Be sure to replace the ORGANIZATION
placeholder with the name used for your organization's private repository within the Chainguard registry.
Our latest
tag uses the most recent build of the Wolfi Cosign package. The following tagged variant is available without authentication:
latest
: This is an image for running cosign
commands. It does not include a shell or other applications.This will automatically pull the image to your local system and execute the command cosign version
:
You should see output similar to this:
For example, from GitHub Actions:
To verify an image signature, use the image to run Cosign's verify
command. Since as of Cosign 2.0, Cosign defaults to using Sigstore's keyless mode, you'll need to also specify the OIDC issuer and signer identity to tell Cosign who you trust for the verification process.
For convenience, you can export those values as environment variables in your shell, and then tell Docker to pass those environment variables into the running Cosign container.
For example, to use the Cosign image to verify the signature of the Cosign image itself:
To obtain detailed information about the environment, you can run the cosign env
command:
If you have a Zendesk account (typically set up for you by your Customer Success Manager) you can reach out to Chainguard's Customer Success team through our Zendesk portal.
Chainguard Images are a collection of container images designed for security and minimalism.
Many Chainguard Images are distroless; they contain only an open-source application and its runtime dependencies. These images do not even contain a shell or package manager. Chainguard Images are built with Wolfi, our Linux undistro designed to produce container images that meet the requirements of a secure software supply chain.
The main features of Chainguard Images include:
-dev
VariantsAs mentioned previously, Chainguard’s distroless Images have no shell or package manager by default. This is great for security, but sometimes you need these things, especially in builder images. For those cases, most (but not all) Chainguard Images come paired with a -dev
variant which does include a shell and package manager.
Although the -dev
image variants have similar security features as their distroless versions, such as complete SBOMs and signatures, they feature additional software that is typically not necessary in production environments. The general recommendation is to use the -dev
variants only to build the application and then copy all application artifacts into a distroless image, which will result in a final container image that has a minimal attack surface and won’t allow package installations or logins.
That being said, it’s worth noting that -dev
variants of Chainguard Images are completely fine to run in production environments. After all, the -dev
variants are still more secure than many popular container images based on fully-featured operating systems such as Debian and Ubuntu since they carry less software, follow a more frequent patch cadence, and offer attestations for what they include.
To better understand how to work with Chainguard Images, we encourage you to visit Chainguard Academy, our documentation and education platform.
Chainguard Images contain software packages that are direct or transitive dependencies. The following licenses were found in the "latest" version of this image:
Apache-2.0
GPL-2.0-only
GPL-2.0-or-later
LGPL-2.1-or-later
MIT
MPL-2.0
For a complete list of licenses, please refer to this Image's SBOM.
Software license agreementA FIPS validated version of this image is available for FedRAMP compliance. STIG is included with FIPS image.