# tag ```markdown Usage: docker tag IMAGE[:TAG] IMAGE[:TAG] Tag an image into a repository Options: --help Print usage ``` An image name is made up of slash-separated name components, optionally prefixed by a registry hostname. The hostname must comply with standard DNS rules, but may not contain underscores. If a hostname is present, it may optionally be followed by a port number in the format `:8080`. If not present, the command uses Docker's public registry located at `registry-1.docker.io` by default. Name components may contain lowercase characters, digits and separators. A separator is defined as a period, one or two underscores, or one or more dashes. A name component may not start or end with a separator. A tag name may contain lowercase and uppercase characters, digits, underscores, periods and dashes. A tag name may not start with a period or a dash and may contain a maximum of 128 characters. You can group your images together using names and tags, and then upload them to [*Share Images via Repositories*](../../tutorials/dockerrepos.md#contributing-to-docker-hub). # Examples ## Tagging an image referenced by ID To tag a local image with ID "0e5574283393" into the "fedora" repository with "version1.0": docker tag 0e5574283393 fedora/httpd:version1.0 ## Tagging an image referenced by Name To tag a local image with name "httpd" into the "fedora" repository with "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`. ## Tagging an image referenced by Name and Tag To tag a local image with name "httpd" and tag "test" into the "fedora" repository with "version1.0.test": docker tag httpd:test fedora/httpd:version1.0.test ## Tagging an image for a private repository To push an image to a private registry and not the central Docker registry you must tag it with the registry hostname and port (if needed). docker tag 0e5574283393 myregistryhost:5000/fedora/httpd:version1.0