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docker tag

Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

Usage 

docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

Description

A full image name has the following format and components:

[HOST[:PORT_NUMBER]/]PATH

  • HOST: The optional registry hostname specifies where the image is located. The hostname must comply with standard DNS rules, but may not contain underscores. If the hostname is not specified, the command uses Docker's public registry at registry-1.docker.io by default. Note that docker.io is the canonical reference for Docker's public registry.
  • PORT_NUMBER: If a hostname is present, it may optionally be followed by a registry port number in the format :8080.
  • PATH: The path consists of slash-separated components. Each component may contain lowercase letters, digits and separators. A separator is defined as a period, one or two underscores, or one or more hyphens. A component may not start or end with a separator. While the OCI Distribution Specification supports more than two slash-separated components, most registries only support two slash-separated components. For Docker's public registry, the path format is as follows:
    • [NAMESPACE/]REPOSITORY: The first, optional component is typically a user's or an organization's namespace. The second, mandatory component is the repository name. When the namespace is not present, Docker uses library as the default namespace.

After the image name, the optional TAG is a custom, human-readable manifest identifier that is typically a specific version or variant of an image. The tag must be valid ASCII and can contain lowercase and uppercase letters, digits, underscores, periods, and hyphens. It cannot start with a period or hyphen and must be no longer than 128 characters. If the tag is not specified, the command uses latest by default.

You can group your images together using names and tags, and then push them to a registry.

Examples

Tag an image referenced by ID

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

$ docker tag 0e5574283393 fedora/httpd:version1.0

Tag an image referenced by Name

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

$ docker tag httpd fedora/httpd:version1.0

Note that since the tag name is not 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":

$ docker tag httpd:test fedora/httpd: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).

$ docker tag 0e5574283393 myregistryhost:5000/fedora/httpd:version1.0