DockerCLI/man/docker-tag.1.md

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% DOCKER(1) Docker User Manuals
% Docker Community
% JUNE 2014
# NAME
docker-tag - Tag an image into a repository
# SYNOPSIS
**docker tag**
[**--help**]
IMAGE[:TAG] [REGISTRY_HOST/][USERNAME/]NAME[:TAG]
# DESCRIPTION
Assigns a new alias to an image in a registry. An alias refers to the
entire image name including the optional `TAG` after the ':'.
If you do not specify a `REGISTRY_HOST`, the command uses Docker's public
registry located at `registry-1.docker.io` by default.
# "OPTIONS"
**--help**
Print usage statement.
**REGISTRY_HOST**
The hostname of the registry if required. This may also include the port
separated by a ':'
**USERNAME**
The username or other qualifying identifier for the image.
**NAME**
The image name.
**TAG**
The tag you are assigning to the image. Though this is arbitrary it is
recommended to be used for a version to distinguish images with the same name.
Also, for consistency tags should only include a-z0-9-_. .
Note that here TAG is a part of the overall name or "tag".
# EXAMPLES
## Giving an image a new alias
Here is an example of aliasing an image (e.g., 0e5574283393) as "httpd" and
tagging it into the "fedora" repository with "version1.0":
docker tag 0e5574283393 fedora/httpd:version1.0
## 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
# HISTORY
April 2014, Originally compiled by William Henry (whenry at redhat dot com)
based on docker.com source material and internal work.
June 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>
July 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>
April 2015, updated by Mary Anthony for v2 <mary@docker.com>
June 2015, updated by Sally O'Malley <somalley@redhat.com>