Dan Walsh a2b529ead2 --help option and help command should print to stdout not stderr

--help and help are successful commands so output should not go to error.

    QE teams have requested this change, also users doing docker help | less
    or docker run --help | less would expect this to work.

    Usage statement should only be printed when the user asks for it.
    Errors should print error message and then suggest the docker COMMAND --help
    command to see usage information.

    The current behaviour causes the user to have to search for the error message
    and sometimes scrolls right off the screen.  For example a error on a
    "docker run" command is very difficult to diagnose.

    Finally erros should always exit with a non 0 exit code, if the user
    makes a CLI error.

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)

2015-01-06 13:40:14 +01:00

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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 [-f|--force[=false]] [--help] IMAGE[:TAG] [REGISTRYHOST/][USERNAME/]NAME[:TAG]

DESCRIPTION

This will give a new alias to an image in the repository. This refers to the entire image name including the optional TAG after the ':'.

"OPTIONS"

-f, --force=true|false When set to true, force the alias. The default is false.

REGISTRYHOST 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. Note that here TAG is a part of the overall name or "tag".

OPTIONS

-f, --force=true|false Force. The default is false.

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 an 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

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