docker-image-tag - Create a tag TARGET_IMAGE that refers to
docker image tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]
Assigns a new alias to an image in a registry. An alias refers to the
entire image name including the optional TAG after the ':'.
The image name which is made up of slash-separated name components,
optionally prefixed by a registry hostname. The hostname must comply
standard DNS rules, but may not contain underscores. If a hostname
present, it may optionally be followed by a port number in the
:8080. If not present, the command uses Docker's public registry
registry-1.docker.io by default. Name components may contain
letters, digits and separators. A separator is defined as a period,
two underscores, or one or more dashes. A name component may not
start or end
with a separator.
The tag assigned to the image to version and distinguish images with
name. The tag name must be valid ASCII and may contain lowercase and
uppercase letters, digits, underscores, periods and hyphens. A tag
may not start with a period or a hyphen and may contain a maximum of
Tagging an image referenced by ID
To tag a local image with ID "0e5574283393" into the "fedora"
repository with "version1.0":
docker image tag 0e5574283393 fedora/httpd:version1.0
Tagging an image referenced by Name
To tag a local image with name "httpd" into the "fedora" repository
docker image 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 image 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
docker image tag 0e5574283393 myregistryhost:5000/fedora/httpd:version1.0
help for tag
Docker Community Feb 2018 DOCKER(1)