Image Metadata

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Defining image metadata helps OKD better consume your container images, allowing OKD to create a better experience for developers using your image. For example, you can add metadata to provide helpful descriptions of your image, or offer suggestions on other images that may also be needed.

This topic only defines the metadata needed by the current set of use cases. Additional metadata or use cases may be added in the future.

Defining Image Metadata

You can use the instruction in a Dockerfile to define image metadata. Labels are similar to environment variables in that they are key value pairs attached to an image or a container. Labels are different from environment variable in that they are not visible to the running application and they can also be used for fast look-up of images and containers.

for more information on the LABEL instruction.

See the Docker custom metadata documentation for details about the format.