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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-info - Display system-wide information

SYNOPSIS

docker info [--help]

DESCRIPTION

This command displays system wide information regarding the Docker installation. Information displayed includes the number of containers and images, pool name, data file, metadata file, data space used, total data space, metadata space used , total metadata space, execution driver, and the kernel version.

The data file is where the images are stored and the metadata file is where the meta data regarding those images are stored. When run for the first time Docker allocates a certain amount of data space and meta data space from the space available on the volume where /var/lib/docker is mounted.

OPTIONS

--help Print usage statement

EXAMPLES

Display Docker system information

Here is a sample output:

# docker info
Containers: 14
Images: 52
Storage Driver: aufs
 Root Dir: /var/lib/docker/aufs
 Dirs: 80
Execution Driver: native-0.2
Kernel Version: 3.13.0-24-generic
Operating System: Ubuntu 14.04 LTS
CPUs: 1
Total Memory: 2 GiB

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

1.3 KiB Raw Blame History