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Showing content from https://docs.docker.com/engine/reference/commandline/tag/ below:

docker image tag | Docker Docs

docker image tag Description Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE Usage docker image tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG] Aliases

An alias is a short or memorable alternative for a longer command.

docker tag

A Docker image reference consists of several components that describe where the image is stored and its identity. These components are:

HOST: Specifies the registry location where the image resides. If omitted, Docker defaults to Docker Hub (docker.io).
PORT: An optional port number for the registry, if necessary (for example, :5000).
NAMESPACE/REPOSITORY: The namespace (optional) usually represents a user or organization. The repository is required and identifies the specific image. If the namespace is omitted, Docker defaults to library, the namespace reserved for Docker Official Images.
TAG: An optional identifier used to specify a particular version or variant of the image. If no tag is provided, Docker defaults to latest.

Example image references

example.com:5000/team/my-app:2.0

Host: example.com
Port: 5000
Namespace: team
Repository: my-app
Tag: 2.0

alpine

Host: docker.io (default)
Namespace: library (default)
Repository: alpine
Tag: latest (default)

For more information on the structure and rules of image naming, refer to the Distribution reference as the canonical definition of the format.

Tag an image referenced by ID

To tag a local image with ID 0e5574283393 as fedora/httpd with the tag version1.0:

Tag an image referenced by Name

To tag a local image httpd as fedora/httpd with the tag version1.0:

Note that since the tag name isn't specified, the alias is created for an existing local version httpd:latest.

Tag an image referenced by Name and Tag

To tag a local image with the name httpd and the tag test as fedora/httpd with the tag version1.0.test:

Tag an image for a private registry

To push an image to a private registry and not the public Docker registry you must include the registry hostname and port (if needed).

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