认识

官网：https://github.com/containers/skopeo
文档：https://github.com/containers/skopeo
仓库：https://github.com/containers/skopeo

skopeo is a command line utility that performs various operations on container images and image repositories.

简而言之，该工具能够，在仓库间复制镜像、查看仓库中镜像内容、删除仓库中镜像、仓库间镜像同步、……

性质

Skopeo can perform operations which consist of:

• Copying an image from and to various storage mechanisms. For example you can copy images from one registry to another, without requiring privilege.
• Inspecting a remote image showing its properties including its layers, without requiring you to pull the image to the host.
• Deleting an image from an image repository.
• Syncing an external image repository to an internal registry for air-gapped deployments.
• When required by the repository, skopeo can pass the appropriate credentials and certificates for authentication.

Skopeo operates on the following image and repository types:

• containers-storage:docker-reference An image located in a local containers/storage image store. Both the location and image store are specified in /etc/containers/storage.conf. (This is the backend for Podman, CRI-O, Buildah and friends)
• dir:path An existing local directory path storing the manifest, layer tarballs and signatures as individual files. This is a non-standardized format, primarily useful for debugging or noninvasive container inspection.
• docker://docker-reference An image in a registry implementing the “Docker Registry HTTP API V2”. By default, uses the authorization state in $XDG_RUNTIME_DIR/containers/auth.json, which is set using skopeo login.
• docker-archive:path[:docker-reference] An image is stored in a docker save-formatted file. docker-reference is only used when creating such a file, and it must not contain a digest.
• docker-daemon:docker-reference An image docker-reference stored in the docker daemon internal storage. docker-reference must contain either a tag or a digest. Alternatively, when reading images, the format can also be docker-daemon:algo:digest (an image ID).
• oci:path:tag An image tag in a directory compliant with “Open Container Image Layout Specification” at path.