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Docker Remote API v1.7

1. Brief introduction

The Remote API has replaced rcli
The daemon listens on unix:///var/run/docker.sock but you can bind Docker to another host/port or a Unix socket.
The API tends to be REST, but for some complex commands, like attach or pull, the HTTP connection is hijacked to transport stdout, stdin and stderr

2. Endpoints

2.1 Containers

List containers

GET /containers/json

List containers

Example request:

    GET /containers/json?all=1&before=8dfafdbc3a40&size=1 HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    [
         {
                 "Id": "8dfafdbc3a40",
                 "Image": "base:latest",
                 "Command": "echo 1",
                 "Created": 1367854155,
                 "Status": "Exit 0",
                 "Ports": [{"PrivatePort": 2222, "PublicPort": 3333, "Type": "tcp"}],
                 "SizeRw": 12288,
                 "SizeRootFs": 0
         },
         {
                 "Id": "9cd87474be90",
                 "Image": "base:latest",
                 "Command": "echo 222222",
                 "Created": 1367854155,
                 "Status": "Exit 0",
                 "Ports": [],
                 "SizeRw": 12288,
                 "SizeRootFs": 0
         },
         {
                 "Id": "3176a2479c92",
                 "Image": "base:latest",
                 "Command": "echo 3333333333333333",
                 "Created": 1367854154,
                 "Status": "Exit 0",
                 "Ports":[],
                 "SizeRw":12288,
                 "SizeRootFs":0
         },
         {
                 "Id": "4cb07b47f9fb",
                 "Image": "base:latest",
                 "Command": "echo 444444444444444444444444444444444",
                 "Created": 1367854152,
                 "Status": "Exit 0",
                 "Ports": [],
                 "SizeRw": 12288,
                 "SizeRootFs": 0
         }
    ]

Query Parameters:

all – 1/True/true or 0/False/false, Show all containers. Only running containers are shown by default (i.e., this defaults to false)
limit – Show limit last created containers, include non-running ones.
since – Show only containers created since Id, include non-running ones.
before – Show only containers created before Id, include non-running ones.
size – 1/True/true or 0/False/false, Show the containers sizes

Status Codes:

200 – no error
400 – bad parameter
500 – server error

Create a container

POST /containers/create

Create a container

Example request:

    POST /containers/create HTTP/1.1
    Content-Type: application/json

    {
         "Hostname":"",
         "User":"",
         "Memory":0,
         "MemorySwap":0,
         "AttachStdin":false,
         "AttachStdout":true,
         "AttachStderr":true,
         "PortSpecs":null,
         "Tty":false,
         "OpenStdin":false,
         "StdinOnce":false,
         "Env":null,
         "Cmd":[
                 "date"
         ],
         "Dns":null,
         "Image":"base",
         "Volumes":{
                 "/tmp": {}
         },
         "VolumesFrom":"",
         "WorkingDir":"",
         "ExposedPorts":{
                 "22/tcp": {}
         }
    }

Example response:

    HTTP/1.1 201 Created
    Content-Type: application/json

    {
         "Id":"e90e34656806"
         "Warnings":[]
    }

Json Parameters:

config – the container's configuration

Status Codes:

201 – no error
404 – no such container
406 – impossible to attach (container not running)
500 – server error

Inspect a container

GET /containers/(id)/json

Return low-level information on the container id

Example request:

    GET /containers/4fa6e0f0c678/json HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
                 "Id": "4fa6e0f0c6786287e131c3852c58a2e01cc697a68231826813597e4994f1d6e2",
                 "Created": "2013-05-07T14:51:42.041847+02:00",
                 "Path": "date",
                 "Args": [],
                 "Config": {
                         "Hostname": "4fa6e0f0c678",
                         "User": "",
                         "Memory": 0,
                         "MemorySwap": 0,
                         "AttachStdin": false,
                         "AttachStdout": true,
                         "AttachStderr": true,
                         "PortSpecs": null,
                         "Tty": false,
                         "OpenStdin": false,
                         "StdinOnce": false,
                         "Env": null,
                         "Cmd": [
                                 "date"
                         ],
                         "Dns": null,
                         "Image": "base",
                         "Volumes": {},
                         "VolumesFrom": "",
                         "WorkingDir": ""
                 },
                 "State": {
                         "Running": false,
                         "Pid": 0,
                         "ExitCode": 0,
                         "StartedAt": "2013-05-07T14:51:42.087658+02:01360",
                         "Ghost": false
                 },
                 "Image": "b750fe79269d2ec9a3c593ef05b4332b1d1a02a62b4accb2c21d589ff2f5f2dc",
                 "NetworkSettings": {
                         "IpAddress": "",
                         "IpPrefixLen": 0,
                         "Gateway": "",
                         "Bridge": "",
                         "PortMapping": null
                 },
                 "SysInitPath": "/home/kitty/go/src/github.com/docker/docker/bin/docker",
                 "ResolvConfPath": "/etc/resolv.conf",
                 "Volumes": {}
    }

Status Codes:

200 – no error
404 – no such container
500 – server error

List processes running inside a container

GET /containers/(id)/top

List processes running inside the container id

Example request:

    GET /containers/4fa6e0f0c678/top HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
         "Titles": [
                 "USER",
                 "PID",
                 "%CPU",
                 "%MEM",
                 "VSZ",
                 "RSS",
                 "TTY",
                 "STAT",
                 "START",
                 "TIME",
                 "COMMAND"
                 ],
         "Processes": [
                 ["root","20147","0.0","0.1","18060","1864","pts/4","S","10:06","0:00","bash"],
                 ["root","20271","0.0","0.0","4312","352","pts/4","S+","10:07","0:00","sleep","10"]
         ]
    }

Query Parameters:

ps_args – ps arguments to use (e.g., aux)

Status Codes:

200 – no error
404 – no such container
500 – server error

Inspect changes on a container's filesystem

GET /containers/(id)/changes

Inspect changes on container id's filesystem

Example request:

    GET /containers/4fa6e0f0c678/changes HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    [
         {
                 "Path": "/dev",
                 "Kind": 0
         },
         {
                 "Path": "/dev/kmsg",
                 "Kind": 1
         },
         {
                 "Path": "/test",
                 "Kind": 1
         }
    ]

Status Codes:

200 – no error
404 – no such container
500 – server error

Export a container

GET /containers/(id)/export

Export the contents of container id

Example request:

    GET /containers/4fa6e0f0c678/export HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/octet-stream

    {{ TAR STREAM }}

Status Codes:

200 – no error
404 – no such container
500 – server error

Start a container

POST /containers/(id)/start

Start the container id

Example request:

    POST /containers/(id)/start HTTP/1.1
    Content-Type: application/json

    {
         "Binds":["/tmp:/tmp"],
         "LxcConf":[{"Key":"lxc.utsname","Value":"docker"}],
         "PortBindings":{ "22/tcp": [{ "HostPort": "11022" }] },
         "Privileged":false,
         "PublishAllPorts":false
    }

Binds need to reference Volumes that were defined during container
creation.

Example response:

    HTTP/1.1 204 No Content
    Content-Type: text/plain

Json Parameters:

hostConfig – the container's host configuration (optional)

Status Codes:

204 – no error
404 – no such container
500 – server error

Stop a container

POST /containers/(id)/stop

Stop the container id

Example request:

    POST /containers/e90e34656806/stop?t=5 HTTP/1.1

Example response:

    HTTP/1.1 204 OK

Query Parameters:

t – number of seconds to wait before killing the container

Status Codes:

204 – no error
404 – no such container
500 – server error

Restart a container

POST /containers/(id)/restart

Restart the container id

Example request:

    POST /containers/e90e34656806/restart?t=5 HTTP/1.1

Example response:

    HTTP/1.1 204 No Content

Query Parameters:

t – number of seconds to wait before killing the container

Status Codes:

204 – no error
404 – no such container
500 – server error

Kill a container

POST /containers/(id)/kill

Kill the container id

Example request:

    POST /containers/e90e34656806/kill HTTP/1.1

Example response:

    HTTP/1.1 204 No Content

Status Codes:

204 – no error
404 – no such container
500 – server error

Attach to a container

POST /containers/(id)/attach

Attach to the container id

Example request:

    POST /containers/16253994b7c4/attach?logs=1&stream=0&stdout=1 HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/vnd.docker.raw-stream

    {{ STREAM }}

Query Parameters:

logs – 1/True/true or 0/False/false, return logs. Defaul false
stream – 1/True/true or 0/False/false, return stream. Default false
stdin – 1/True/true or 0/False/false, if stream=true, attach to stdin. Default false
stdout – 1/True/true or 0/False/false, if logs=true, return stdout log, if stream=true, attach to stdout. Default false
stderr – 1/True/true or 0/False/false, if logs=true, return stderr log, if stream=true, attach to stderr. Default false

Status Codes:

200 – no error
400 – bad parameter
404 – no such container
500 – server error

Stream details:

When using the TTY setting is enabled in POST /containers/create , the stream is the raw data from the process PTY and client's stdin. When the TTY is disabled, then the stream is multiplexed to separate stdout and stderr.

The format is a Header and a Payload (frame).

HEADER

The header will contain the information on which stream write the stream (stdout or stderr). It also contain the size of the associated frame encoded on the last 4 bytes (uint32).

It is encoded on the first 8 bytes like this:
```
header := [8]byte{STREAM_TYPE, 0, 0, 0, SIZE1, SIZE2, SIZE3, SIZE4}
```
STREAM_TYPE can be:
0: stdin (will be written on stdout)
1: stdout
2: stderr

SIZE1, SIZE2, SIZE3, SIZE4 are the 4 bytes of the uint32 size encoded as big endian.

PAYLOAD

The payload is the raw stream.

IMPLEMENTATION

The simplest way to implement the Attach protocol is the following:
1. Read 8 bytes
2. chose stdout or stderr depending on the first byte
3. Extract the frame size from the last 4 bytes
4. Read the extracted size and output it on the correct output
5. Goto 1)

Attach to a container (websocket)

GET /containers/(id)/attach/ws

Attach to the container id via websocket

Implements websocket protocol handshake according to RFC 6455

Example request

    GET /containers/e90e34656806/attach/ws?logs=0&stream=1&stdin=1&stdout=1&stderr=1 HTTP/1.1

Example response

    {{ STREAM }}

Query Parameters:

logs – 1/True/true or 0/False/false, return logs. Default false
stream – 1/True/true or 0/False/false, return stream. Default false
stdin – 1/True/true or 0/False/false, if stream=true, attach to stdin. Default false
stdout – 1/True/true or 0/False/false, if logs=true, return stdout log, if stream=true, attach to stdout. Default false
stderr – 1/True/true or 0/False/false, if logs=true, return stderr log, if stream=true, attach to stderr. Default false

Status Codes:

200 – no error
400 – bad parameter
404 – no such container
500 – server error

Wait a container

POST /containers/(id)/wait

Block until container id stops, then returns the exit code

Example request:

    POST /containers/16253994b7c4/wait HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {"StatusCode": 0}

Status Codes:

200 – no error
404 – no such container
500 – server error

Remove a container

DELETE /containers/(id)

Remove the container id from the filesystem

Example request:

    DELETE /containers/16253994b7c4?v=1 HTTP/1.1

Example response:

    HTTP/1.1 204 No Content

Query Parameters:

v – 1/True/true or 0/False/false, Remove the volumes associated to the container. Default false

Status Codes:

204 – no error
400 – bad parameter
404 – no such container
500 – server error

Copy files or folders from a container

POST /containers/(id)/copy

Copy files or folders of container id

Example request:

    POST /containers/4fa6e0f0c678/copy HTTP/1.1
    Content-Type: application/json

    {
         "Resource": "test.txt"
    }

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/octet-stream

    {{ TAR STREAM }}

Status Codes:

200 – no error
404 – no such container
500 – server error

2.2 Images

List Images

GET /images/json

Example request:

    GET /images/json?all=0 HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    [
      {
         "RepoTags": [
           "ubuntu:12.04",
           "ubuntu:precise",
           "ubuntu:latest"
         ],
         "Id": "8dbd9e392a964056420e5d58ca5cc376ef18e2de93b5cc90e868a1bbc8318c1c",
         "Created": 1365714795,
         "Size": 131506275,
         "VirtualSize": 131506275
      },
      {
         "RepoTags": [
           "ubuntu:12.10",
           "ubuntu:quantal"
         ],
         "ParentId": "27cf784147099545",
         "Id": "b750fe79269d2ec9a3c593ef05b4332b1d1a02a62b4accb2c21d589ff2f5f2dc",
         "Created": 1364102658,
         "Size": 24653,
         "VirtualSize": 180116135
      }
    ]

Create an image

POST /images/create

Create an image, either by pull it from the registry or by importing i

Example request:

    POST /images/create?fromImage=base HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {"status":"Pulling..."}
    {"status":"Pulling", "progress":"1/? (n/a)"}
    {"error":"Invalid..."}
    ...

When using this endpoint to pull an image from the registry, the
`X-Registry-Auth` header can be used to include
a base64-encoded AuthConfig object.

Query Parameters:

fromImage – name of the image to pull
fromSrc – source to import, - means stdin
repo – repository
tag – tag
registry – the registry to pull from

Request Headers:

X-Registry-Auth – base64-encoded AuthConfig object

Status Codes:

200 – no error
500 – server error

Insert a file in an image

POST /images/(name)/insert

Insert a file from url in the image name at path

Example request:

    POST /images/test/insert?path=/usr&url=myurl HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {"status":"Inserting..."}
    {"status":"Inserting", "progress":"1/? (n/a)"}
    {"error":"Invalid..."}
    ...

Query Parameters:

url – The url from where the file is taken
path – The path where the file is stored

Status Codes:

200 – no error
500 – server error

Inspect an image

GET /images/(name)/json

Return low-level information on the image name

Example request:

    GET /images/base/json HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
         "id":"b750fe79269d2ec9a3c593ef05b4332b1d1a02a62b4accb2c21d589ff2f5f2dc",
         "parent":"27cf784147099545",
         "created":"2013-03-23T22:24:18.818426-07:00",
         "container":"3d67245a8d72ecf13f33dffac9f79dcdf70f75acb84d308770391510e0c23ad0",
         "container_config":
                 {
                         "Hostname":"",
                         "User":"",
                         "Memory":0,
                         "MemorySwap":0,
                         "AttachStdin":false,
                         "AttachStdout":false,
                         "AttachStderr":false,
                         "PortSpecs":null,
                         "Tty":true,
                         "OpenStdin":true,
                         "StdinOnce":false,
                         "Env":null,
                         "Cmd": ["/bin/bash"],
                         "Dns":null,
                         "Image":"base",
                         "Volumes":null,
                         "VolumesFrom":"",
                         "WorkingDir":""
                 },
         "Size": 6824592
    }

Status Codes:

200 – no error
404 – no such image
500 – server error

Get the history of an image

GET /images/(name)/history

Return the history of the image name

Example request:

    GET /images/base/history HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    [
         {
                 "Id": "b750fe79269d",
                 "Created": 1364102658,
                 "CreatedBy": "/bin/bash"
         },
         {
                 "Id": "27cf78414709",
                 "Created": 1364068391,
                 "CreatedBy": ""
         }
    ]

Status Codes:

200 – no error
404 – no such image
500 – server error

Push an image on the registry

POST /images/(name)/push

Push the image name on the registry

Example request:

    POST /images/test/push HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {"status":"Pushing..."}
    {"status":"Pushing", "progress":"1/? (n/a)"}
    {"error":"Invalid..."}
    ...

Request Headers:

X-Registry-Auth – include a base64-encoded AuthConfig object.

Status Codes:

200 – no error
404 – no such image
500 – server error

Tag an image into a repository

POST /images/(name)/tag

Tag the image name into a repository

Example request:

    POST /images/test/tag?repo=myrepo&force=0&tag=v42 HTTP/1.1

Example response:

    HTTP/1.1 201 OK

Query Parameters:

repo – The repository to tag in
force – 1/True/true or 0/False/false, default false
tag - The new tag name

Status Codes:

201 – no error
400 – bad parameter
404 – no such image
409 – conflict
500 – server error

Remove an image

DELETE /images/(name)

Remove the image name from the filesystem

Example request:

    DELETE /images/test HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-type: application/json

    [
     {"Untagged": "3e2f21a89f"},
     {"Deleted": "3e2f21a89f"},
     {"Deleted": "53b4f83ac9"}
    ]

Status Codes:

200 – no error
404 – no such image
409 – conflict
500 – server error

Search images

GET /images/search

Search for an image on Docker Hub.

Note: The response keys have changed from API v1.6 to reflect the JSON sent by the registry server to the docker daemon's request.

Example request:

    GET /images/search?term=sshd HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    [
            {
                "description": "",
                "is_official": false,
                "is_trusted": false,
                "name": "wma55/u1210sshd",
                "star_count": 0
            },
            {
                "description": "",
                "is_official": false,
                "is_trusted": false,
                "name": "jdswinbank/sshd",
                "star_count": 0
            },
            {
                "description": "",
                "is_official": false,
                "is_trusted": false,
                "name": "vgauthier/sshd",
                "star_count": 0
            }
    ...
    ]

Query Parameters:

term – term to search

Status Codes:

200 – no error
500 – server error

2.3 Misc

Build an image from Dockerfile via stdin

POST /build

Build an image from Dockerfile via stdin

Example request:

    POST /build HTTP/1.1

    {{ TAR STREAM }}

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {{ STREAM }}

The stream must be a tar archive compressed with one of the
following algorithms: identity (no compression), gzip, bzip2, xz.

The archive must include a file called `Dockerfile`
at its root. It may include any number of other files,
which will be accessible in the build context (See the [*ADD build
command*](/builder/#dockerbuilder)).

Query Parameters:

t – repository name (and optionally a tag) to be applied to the resulting image in case of success
remote – build source URI (git or HTTPS/HTTP)
q – suppress verbose build output
nocache – do not use the cache when building the image

Request Headers:
Content-type – should be set to "application/tar".

Status Codes:

200 – no error
500 – server error

Check auth configuration

POST /auth

Get the default username and email

Example request:

    POST /auth HTTP/1.1
    Content-Type: application/json

    {
         "username":" hannibal",
         "password: "xxxx",
         "email": "hannibal@a-team.com",
         "serveraddress": "https://index.docker.io/v1/"
    }

Example response:

    HTTP/1.1 200 OK
    Content-Type: text/plain

Status Codes:

200 – no error
204 – no error
500 – server error

Display system-wide information

GET /info

Display system-wide information

Example request:

    GET /info HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
         "Containers":11,
         "Images":16,
         "Debug":false,
         "NFd": 11,
         "NGoroutines":21,
         "MemoryLimit":true,
         "SwapLimit":false,
         "IPv4Forwarding":true
    }

Status Codes:

200 – no error
500 – server error

Show the docker version information

GET /version

Show the docker version information

Example request:

    GET /version HTTP/1.1

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
         "Version":"0.2.2",
         "GitCommit":"5a2a5cc+CHANGES",
         "GoVersion":"go1.0.3"
    }

Status Codes:

200 – no error
500 – server error

Create a new image from a container's changes

POST /commit

Create a new image from a container's changes

Example request:

    POST /commit?container=44c004db4b17&m=message&repo=myrepo HTTP/1.1

Example response:

    HTTP/1.1 201 OK
        Content-Type: application/vnd.docker.raw-stream

    {"Id": "596069db4bf5"}

Query Parameters:

container – source container
repo – repository
tag – tag
m – commit message
author – author (e.g., "John Hannibal Smith <hannibal@a-team.com>")
run – config automatically applied when the image is run. (ex: {"Cmd": ["cat", "/world"], "PortSpecs":["22"]})

Status Codes:

201 – no error
404 – no such container
500 – server error

Monitor Docker's events

GET /events

Get events from docker, either in real time via streaming, or via polling (using since).

Docker containers will report the following events:

create, destroy, die, export, kill, pause, restart, start, stop, unpause

and Docker images will report:

untag, delete

Example request:

    GET /events?since=1374067924

Example response:

    HTTP/1.1 200 OK
    Content-Type: application/json

    {"status": "create", "id": "dfdf82bd3881","from": "base:latest", "time":1374067924}
    {"status": "start", "id": "dfdf82bd3881","from": "base:latest", "time":1374067924}
    {"status": "stop", "id": "dfdf82bd3881","from": "base:latest", "time":1374067966}
    {"status": "destroy", "id": "dfdf82bd3881","from": "base:latest", "time":1374067970}

Query Parameters:

since – timestamp used for polling

Status Codes:

200 – no error
500 – server error

Get a tarball containing all images and tags in a repository

GET /images/(name)/get

Get a tarball containing all images and metadata for the repository specified by name.

Example request

           GET /images/ubuntu/get

Example response:

       .. sourcecode:: http

          HTTP/1.1 200 OK
    Content-Type: application/x-tar

    Binary data stream
        :statuscode 200: no error
        :statuscode 500: server error

Load a tarball with a set of images and tags into docker

POST /images/load

Load a set of images and tags into the docker repository.

Example request

        POST /images/load

      Tarball in body

    **Example response**:

    .. sourcecode:: http

       HTTP/1.1 200 OK

     :statuscode 200: no error
     :statuscode 500: server error

3. Going further

3.1 Inside `docker run`

Here are the steps of docker run :

Create the container
If the status code is 404, it means the image doesn't exist: - Try to pull it - Then retry to create the container
Start the container
If you are not in detached mode: - Attach to the container, using logs=1 (to have stdout and stderr from the container's start) and stream=1
If in detached mode or only stdin is attached: - Display the container's id

3.2 Hijacking

In this version of the API, /attach, uses hijacking to transport stdin, stdout and stderr on the same socket. This might change in the future.

3.3 CORS Requests

To enable cross origin requests to the remote api add the flag "--api-enable-cors" when running docker in daemon mode.

$ docker -d -H="192.168.1.9:2375" --api-enable-cors

29 KiB Raw Blame History Unescape Escape

Docker Remote API v1.7

1. Brief introduction

2. Endpoints

2.1 Containers

List containers

Create a container

Inspect a container

List processes running inside a container

Inspect changes on a container's filesystem

Export a container

Start a container

Stop a container

Restart a container

Kill a container

Attach to a container

Attach to a container (websocket)

Wait a container

Remove a container

Copy files or folders from a container

2.2 Images

List Images

Create an image

Insert a file in an image

Inspect an image

Get the history of an image

Push an image on the registry

Tag an image into a repository

Remove an image

Search images

2.3 Misc

Build an image from Dockerfile via stdin

Check auth configuration

Display system-wide information

Show the docker version information

Create a new image from a container's changes

Monitor Docker's events

Get a tarball containing all images and tags in a repository

Load a tarball with a set of images and tags into docker

3. Going further

3.1 Inside docker run

3.2 Hijacking

3.3 CORS Requests

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3.1 Inside `docker run`