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skopeo:tldr:3485b
The command you mentioned is used to copy Docker images from a source registry to a destination registry. Here's an explanation of the different parts of the command:
-
skopeo
: It is a command-line tool used for various operations on container images, including copying, inspecting, and deleting images. -
copy
: This is a subcommand inskopeo
used to copy images between different registries. -
docker://${source_registry}/${image:tag}
: This represents the source image's location in a Docker-compatible registry. Let's break it down:docker://
: Indicates that the registry uses the Docker V2 API.${source_registry}
: The URL or hostname of the registry where the source image is located.${image:tag}
: The name and tag of the image you want to copy from the source registry.
-
docker://${destination_registry}/${image:tag}
: This represents the destination image's location in another Docker-compatible registry. It has a similar structure to the source image's location, with the following changes:${destination_registry}
: The URL or hostname of the registry where you want to copy the image.${image:tag}
: The name and tag of the image you want to assign in the destination registry.
So, when you run this command, skopeo
will copy the specified Docker image (identified by ${image:tag}
) from the source registry to the destination registry.