mirror of https://github.com/moby/moby.git synced 2022-11-09 12:21:53 -05:00

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

7.1 KiB

Raw Blame History

% DOCKER(1) Docker User Manuals % Docker Community % JUNE 2014

NAME

docker-inspect - Return low-level information on a container or image

SYNOPSIS

docker inspect [--help] [-f|--format[=FORMAT]] CONTAINER|IMAGE [CONTAINER|IMAGE...]

DESCRIPTION

This displays all the information available in Docker for a given container or image. By default, this will render all results in a JSON array. If a format is specified, the given template will be executed for each result.

OPTIONS

--help Print usage statement

-f, --format="" Format the output using the given go template.

EXAMPLES

Getting information on a container

To get information on a container use it's ID or instance name:

#docker inspect 1eb5fabf5a03
[{
   "ID": "1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b",
   "Created": "2014-04-04T21:33:52.02361335Z",
   "Path": "/usr/sbin/nginx",
   "Args": [],
   "Config": {
        "Hostname": "1eb5fabf5a03",
        "Domainname": "",
        "User": "",
        "Memory": 0,
        "MemorySwap": 0,
        "CpuShares": 0,
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": {
            "80/tcp": {}
    },
    "Tty": true,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
           "HOME=/",
       "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "Cmd": [
            "/usr/sbin/nginx"
        ],
        "Dns": null,
        "DnsSearch": null,
        "Image": "summit/nginx",
        "Volumes": null,
        "VolumesFrom": "",
        "WorkingDir": "",
        "Entrypoint": null,
        "NetworkDisabled": false,
        "OnBuild": null,
        "Context": {
           "mount_label": "system_u:object_r:svirt_sandbox_file_t:s0:c0,c650",
       "process_label": "system_u:system_r:svirt_lxc_net_t:s0:c0,c650"
    }
    },
    "State": {
        "Running": true,
        "Pid": 858,
        "ExitCode": 0,
        "StartedAt": "2014-04-04T21:33:54.16259207Z",
        "FinishedAt": "0001-01-01T00:00:00Z",
        "Ghost": false
    },
    "Image": "df53773a4390e25936f9fd3739e0c0e60a62d024ea7b669282b27e65ae8458e6",
    "NetworkSettings": {
        "IPAddress": "172.17.0.2",
        "IPPrefixLen": 16,
        "Gateway": "172.17.42.1",
        "Bridge": "docker0",
        "PortMapping": null,
        "Ports": {
            "80/tcp": [
                {
                    "HostIp": "0.0.0.0",
                    "HostPort": "80"
                }
            ]
        }
    },
    "ResolvConfPath": "/etc/resolv.conf",
    "HostnamePath": "/var/lib/docker/containers/1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b/hostname",
    "HostsPath": "/var/lib/docker/containers/1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b/hosts",
    "Name": "/ecstatic_ptolemy",
    "Driver": "devicemapper",
    "ExecDriver": "native-0.1",
    "Volumes": {},
    "VolumesRW": {},
    "HostConfig": {
    "Binds": null,
        "ContainerIDFile": "",
        "LxcConf": [],
        "Privileged": false,
        "PortBindings": {
            "80/tcp": [
                {
                    "HostIp": "0.0.0.0",
                    "HostPort": "80"
                }
            ]
        },
        "Links": null,
        "PublishAllPorts": false,
        "DriverOptions": {
            "lxc": null
        },
        "CliAddress": ""
    }

Getting the IP address of a container instance

To get the IP address of a container use:

# docker inspect --format='{{.NetworkSettings.IPAddress}}' 1eb5fabf5a03
172.17.0.2

Listing all port bindings

One can loop over arrays and maps in the results to produce simple text output:

# docker inspect --format='{{range $p, $conf := .NetworkSettings.Ports}} \
 {{$p}} -> {{(index $conf 0).HostPort}} {{end}}' 1eb5fabf5a03

80/tcp -> 80

Getting information on an image

Use an image's ID or name (e.g., repository/name[:tag]) to get information on it.

# docker inspect 58394af37342
[{
    "id": "58394af373423902a1b97f209a31e3777932d9321ef10e64feaaa7b4df609cf9",
    "parent": "8abc22bad04266308ff408ca61cb8f6f4244a59308f7efc64e54b08b496c58db",
    "created": "2014-02-03T16:10:40.500814677Z",
    "container": "f718f19a28a5147da49313c54620306243734bafa63c76942ef6f8c4b4113bc5",
    "container_config": {
        "Hostname": "88807319f25e",
        "Domainname": "",
        "User": "",
        "Memory": 0,
        "MemorySwap": 0,
        "CpuShares": 0,
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": null,
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "HOME=/",
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "Cmd": [
            "/bin/sh",
            "-c",
	 "#(nop) ADD fedora-20-dummy.tar.xz in /"
        ],
        "Dns": null,
        "DnsSearch": null,
        "Image": "8abc22bad04266308ff408ca61cb8f6f4244a59308f7efc64e54b08b496c58db",
        "Volumes": null,
        "VolumesFrom": "",
        "WorkingDir": "",
        "Entrypoint": null,
        "NetworkDisabled": false,
        "OnBuild": null,
        "Context": null
    },
    "docker_version": "0.6.3",
    "author": "I P Babble \u003clsm5@ipbabble.com\u003e - ./buildcontainers.sh",
    "config": {
        "Hostname": "88807319f25e",
        "Domainname": "",
        "User": "",
        "Memory": 0,
        "MemorySwap": 0,
        "CpuShares": 0,
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "PortSpecs": null,
        "ExposedPorts": null,
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "HOME=/",
	        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "Cmd": null,
        "Dns": null,
        "DnsSearch": null,
        "Image": "8abc22bad04266308ff408ca61cb8f6f4244a59308f7efc64e54b08b496c58db",
        "Volumes": null,
        "VolumesFrom": "",
        "WorkingDir": "",
        "Entrypoint": null,
        "NetworkDisabled": false,
        "OnBuild": null,
        "Context": null
    },
"architecture": "x86_64",
"Size": 385520098
}]

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

7.1 KiB Raw Blame History