57 KiB
Docker Remote API v1.18
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
orpull
, the HTTP connection is hijacked to transportSTDOUT
,STDIN
andSTDERR
.
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",
"Names":["/boring_feynman"],
"Image": "ubuntu:latest",
"Command": "echo 1",
"Created": 1367854155,
"Status": "Exit 0",
"Ports": [{"PrivatePort": 2222, "PublicPort": 3333, "Type": "tcp"}],
"Labels": {
"com.example.vendor": "Acme",
"com.example.license": "GPL",
"com.example.version": "1.0"
},
"SizeRw": 12288,
"SizeRootFs": 0
},
{
"Id": "9cd87474be90",
"Names":["/coolName"],
"Image": "ubuntu:latest",
"Command": "echo 222222",
"Created": 1367854155,
"Status": "Exit 0",
"Ports": [],
"Labels": {},
"SizeRw": 12288,
"SizeRootFs": 0
},
{
"Id": "3176a2479c92",
"Names":["/sleepy_dog"],
"Image": "ubuntu:latest",
"Command": "echo 3333333333333333",
"Created": 1367854154,
"Status": "Exit 0",
"Ports":[],
"Labels": {},
"SizeRw":12288,
"SizeRootFs":0
},
{
"Id": "4cb07b47f9fb",
"Names":["/running_cat"],
"Image": "ubuntu:latest",
"Command": "echo 444444444444444444444444444444444",
"Created": 1367854152,
"Status": "Exit 0",
"Ports": [],
"Labels": {},
"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
- filters - a json encoded value of the filters (a map[string][]string) to process on the containers list. Available filters:
- exited=<int> -- containers with exit code of <int>
- status=(restarting|running|paused|exited)
- label=
key
orlabel="key=value"
of a container label
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": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": true,
"AttachStderr": true,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": null,
"Cmd": [
"date"
],
"Entrypoint": "",
"Image": "ubuntu",
"Labels": {
"com.example.vendor": "Acme",
"com.example.license": "GPL",
"com.example.version": "1.0"
},
"Volumes": {
"/tmp": {}
},
"WorkingDir": "",
"NetworkDisabled": false,
"MacAddress": "12:34:56:78:9a:bc",
"ExposedPorts": {
"22/tcp": {}
},
"HostConfig": {
"Binds": ["/tmp:/tmp"],
"Links": ["redis3:redis"],
"LxcConf": {"lxc.utsname":"docker"},
"Memory": 0,
"MemorySwap": 0,
"CpuShares": 512,
"CpusetCpus": "0,1",
"PortBindings": { "22/tcp": [{ "HostPort": "11022" }] },
"PublishAllPorts": false,
"Privileged": false,
"ReadonlyRootfs": false,
"Dns": ["8.8.8.8"],
"DnsSearch": [""],
"ExtraHosts": null,
"VolumesFrom": ["parent", "other:ro"],
"CapAdd": ["NET_ADMIN"],
"CapDrop": ["MKNOD"],
"RestartPolicy": { "Name": "", "MaximumRetryCount": 0 },
"NetworkMode": "bridge",
"Devices": [],
"Ulimits": [{}],
"LogConfig": { "Type": "json-file", Config: {} },
"SecurityOpt": [""],
"CgroupParent": ""
}
}
Example response:
HTTP/1.1 201 Created
Content-Type: application/json
{
"Id":"e90e34656806"
"Warnings":[]
}
Json Parameters:
- Hostname - A string value containing the desired hostname to use for the container.
- Domainname - A string value containing the desired domain name to use for the container.
- User - A string value containing the user to use inside the container.
- Memory - Memory limit in bytes.
- MemorySwap- Total memory limit (memory + swap); set
-1
to disable swap, always use this withmemory
, and make the value larger thanmemory
. - CpuShares - An integer value containing the CPU Shares for container (ie. the relative weight vs other containers).
- Cpuset - The same as CpusetCpus, but deprecated, please don't use.
- CpusetCpus - String value containing the cgroups CpusetCpus to use.
- AttachStdin - Boolean value, attaches to stdin.
- AttachStdout - Boolean value, attaches to stdout.
- AttachStderr - Boolean value, attaches to stderr.
- Tty - Boolean value, Attach standard streams to a tty, including stdin if it is not closed.
- OpenStdin - Boolean value, opens stdin,
- StdinOnce - Boolean value, close stdin after the 1 attached client disconnects.
- Env - A list of environment variables in the form of
VAR=value
- Labels - Adds a map of labels that to a container. To specify a map:
{"key":"value"[,"key2":"value2"]}
- Cmd - Command to run specified as a string or an array of strings.
- Entrypoint - Set the entrypoint for the container a string or an array of strings
- Image - String value containing the image name to use for the container
- Volumes – An object mapping mountpoint paths (strings) inside the container to empty objects.
- WorkingDir - A string value containing the working dir for commands to run in.
- NetworkDisabled - Boolean value, when true disables networking for the container
- ExposedPorts - An object mapping ports to an empty object in the form of:
"ExposedPorts": { "<port>/<tcp|udp>: {}" }
- HostConfig
- Binds – A list of volume bindings for this container. Each volume
binding is a string of the form
container_path
(to create a new volume for the container),host_path:container_path
(to bind-mount a host path into the container), orhost_path:container_path:ro
(to make the bind-mount read-only inside the container). - Links - A list of links for the container. Each link entry should be
in the form of
container_name:alias
. - LxcConf - LXC specific configurations. These configurations will only
work when using the
lxc
execution driver. - PortBindings - A map of exposed container ports and the host port they
should map to. It should be specified in the form
{ <port>/<protocol>: [{ "HostPort": "<port>" }] }
Take note thatport
is specified as a string and not an integer value. - PublishAllPorts - Allocates a random host port for all of a container's exposed ports. Specified as a boolean value.
- Privileged - Gives the container full access to the host. Specified as a boolean value.
- ReadonlyRootfs - Mount the container's root filesystem as read only. Specified as a boolean value.
- Dns - A list of dns servers for the container to use.
- DnsSearch - A list of DNS search domains
- ExtraHosts - A list of hostnames/IP mappings to be added to the
container's
/etc/hosts
file. Specified in the form["hostname:IP"]
. - VolumesFrom - A list of volumes to inherit from another container.
Specified in the form
<container name>[:<ro|rw>]
- CapAdd - A list of kernel capabilities to add to the container.
- Capdrop - A list of kernel capabilities to drop from the container.
- RestartPolicy – The behavior to apply when the container exits. The
value is an object with a
Name
property of either"always"
to always restart or"on-failure"
to restart only when the container exit code is non-zero. Ifon-failure
is used,MaximumRetryCount
controls the number of times to retry before giving up. The default is not to restart. (optional) An ever increasing delay (double the previous delay, starting at 100mS) is added before each restart to prevent flooding the server. - NetworkMode - Sets the networking mode for the container. Supported
values are:
bridge
,host
, andcontainer:<name|id>
- Devices - A list of devices to add to the container specified in the
form
{ "PathOnHost": "/dev/deviceName", "PathInContainer": "/dev/deviceName", "CgroupPermissions": "mrw"}
- Ulimits - A list of ulimits to be set in the container, specified as
{ "Name": <name>, "Soft": <soft limit>, "Hard": <hard limit> }
, for example:Ulimits: { "Name": "nofile", "Soft": 1024, "Hard", 2048 }}
- SecurityOpt: A list of string values to customize labels for MLS systems, such as SELinux.
- LogConfig - Log configuration for the container, specified as
{ "Type": "<driver_name>", "Config": {"key1": "val1"}}
. Available types:json-file
,syslog
,none
.json-file
logging driver. - CgroupParent - Path to cgroups under which the cgroup for the container will be created. If the path is not absolute, the path is considered to be relative to the cgroups path of the init process. Cgroups will be created if they do not already exist.
- Binds – A list of volume bindings for this container. Each volume
binding is a string of the form
Query Parameters:
- name – Assign the specified name to the container. Must
match
/?[a-zA-Z0-9_-]+
.
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
{
"AppArmorProfile": "",
"Args": [
"-c",
"exit 9"
],
"Config": {
"AttachStderr": true,
"AttachStdin": false,
"AttachStdout": true,
"Cmd": [
"/bin/sh",
"-c",
"exit 9"
],
"Domainname": "",
"Entrypoint": null,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"ExposedPorts": null,
"Hostname": "ba033ac44011",
"Image": "ubuntu",
"Labels": {
"com.example.vendor": "Acme",
"com.example.license": "GPL",
"com.example.version": "1.0"
},
"MacAddress": "",
"NetworkDisabled": false,
"OnBuild": null,
"OpenStdin": false,
"PortSpecs": null,
"StdinOnce": false,
"Tty": false,
"User": "",
"Volumes": null,
"WorkingDir": ""
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"ExecDriver": "native-0.2",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"CapAdd": null,
"CapDrop": null,
"ContainerIDFile": "",
"CpusetCpus": "",
"CpuShares": 0,
"Devices": [],
"Dns": null,
"DnsSearch": null,
"ExtraHosts": null,
"IpcMode": "",
"Links": null,
"LxcConf": [],
"Memory": 0,
"MemorySwap": 0,
"NetworkMode": "bridge",
"PortBindings": {},
"Privileged": false,
"ReadonlyRootfs": false,
"PublishAllPorts": false,
"RestartPolicy": {
"MaximumRetryCount": 2,
"Name": "on-failure"
},
"LogConfig": {
"Config": null,
"Type": "json-file"
},
"SecurityOpt": null,
"VolumesFrom": null,
"Ulimits": [{}]
},
"HostnamePath": "/var/lib/docker/containers/ba033ac4401106a3b513bc9d639eee123ad78ca3616b921167cd74b20e25ed39/hostname",
"HostsPath": "/var/lib/docker/containers/ba033ac4401106a3b513bc9d639eee123ad78ca3616b921167cd74b20e25ed39/hosts",
"LogPath": "/var/lib/docker/containers/1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b/1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b-json.log",
"Id": "ba033ac4401106a3b513bc9d639eee123ad78ca3616b921167cd74b20e25ed39",
"Image": "04c5d3b7b0656168630d3ba35d8889bd0e9caafcaeb3004d2bfbc47e7c5d35d2",
"MountLabel": "",
"Name": "/boring_euclid",
"NetworkSettings": {
"Bridge": "",
"Gateway": "",
"IPAddress": "",
"IPPrefixLen": 0,
"MacAddress": "",
"PortMapping": null,
"Ports": null
},
"Path": "/bin/sh",
"ProcessLabel": "",
"ResolvConfPath": "/var/lib/docker/containers/ba033ac4401106a3b513bc9d639eee123ad78ca3616b921167cd74b20e25ed39/resolv.conf",
"RestartCount": 1,
"State": {
"Error": "",
"ExitCode": 9,
"FinishedAt": "2015-01-06T15:47:32.080254511Z",
"OOMKilled": false,
"Paused": false,
"Pid": 0,
"Restarting": false,
"Running": false,
"StartedAt": "2015-01-06T15:47:32.072697474Z"
},
"Volumes": {},
"VolumesRW": {}
}
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
Get container logs
GET /containers/(id)/logs
Get stdout and stderr logs from the container id
Note: This endpoint works only for containers with
json-file
logging driver.
Example request:
GET /containers/4fa6e0f0c678/logs?stderr=1&stdout=1×tamps=1&follow=1&tail=10 HTTP/1.1
Example response:
HTTP/1.1 101 UPGRADED
Content-Type: application/vnd.docker.raw-stream
Connection: Upgrade
Upgrade: tcp
{{ STREAM }}
Query Parameters:
- follow – 1/True/true or 0/False/false, return stream. Default false
- stdout – 1/True/true or 0/False/false, show stdout log. Default false
- stderr – 1/True/true or 0/False/false, show stderr log. Default false
- timestamps – 1/True/true or 0/False/false, print timestamps for every log line. Default false
- tail – Output specified number of lines at the end of logs:
all
or<number>
. Default all
Status Codes:
- 101 – no error, hints proxy about hijacking
- 200 – no error, no upgrade header found
- 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
}
]
Values for Kind
:
0
: Modify1
: Add2
: Delete
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
Get container stats based on resource usage
GET /containers/(id)/stats
This endpoint returns a live stream of a container's resource usage statistics.
Note: this functionality currently only works when using the libcontainer exec-driver.
Example request:
GET /containers/redis1/stats HTTP/1.1
Example response:
HTTP/1.1 200 OK
Content-Type: application/json
{
"read" : "2015-01-08T22:57:31.547920715Z",
"network" : {
"rx_dropped" : 0,
"rx_bytes" : 648,
"rx_errors" : 0,
"tx_packets" : 8,
"tx_dropped" : 0,
"rx_packets" : 8,
"tx_errors" : 0,
"tx_bytes" : 648
},
"memory_stats" : {
"stats" : {
"total_pgmajfault" : 0,
"cache" : 0,
"mapped_file" : 0,
"total_inactive_file" : 0,
"pgpgout" : 414,
"rss" : 6537216,
"total_mapped_file" : 0,
"writeback" : 0,
"unevictable" : 0,
"pgpgin" : 477,
"total_unevictable" : 0,
"pgmajfault" : 0,
"total_rss" : 6537216,
"total_rss_huge" : 6291456,
"total_writeback" : 0,
"total_inactive_anon" : 0,
"rss_huge" : 6291456,
"hierarchical_memory_limit" : 67108864,
"total_pgfault" : 964,
"total_active_file" : 0,
"active_anon" : 6537216,
"total_active_anon" : 6537216,
"total_pgpgout" : 414,
"total_cache" : 0,
"inactive_anon" : 0,
"active_file" : 0,
"pgfault" : 964,
"inactive_file" : 0,
"total_pgpgin" : 477
},
"max_usage" : 6651904,
"usage" : 6537216,
"failcnt" : 0,
"limit" : 67108864
},
"blkio_stats" : {},
"cpu_stats" : {
"cpu_usage" : {
"percpu_usage" : [
16970827,
1839451,
7107380,
10571290
],
"usage_in_usermode" : 10000000,
"total_usage" : 36488948,
"usage_in_kernelmode" : 20000000
},
"system_cpu_usage" : 20091722000000000,
"throttling_data" : {}
}
}
Status Codes:
- 200 – no error
- 404 – no such container
- 500 – server error
Resize a container TTY
POST /containers/(id)/resize?h=<height>&w=<width>
Resize the TTY for container with id
. The container must be restarted for the resize to take effect.
Example request:
POST /containers/4fa6e0f0c678/resize?h=40&w=80 HTTP/1.1
Example response:
HTTP/1.1 200 OK
Content-Length: 0
Content-Type: text/plain; charset=utf-8
Status Codes:
- 200 – no error
- 404 – No such container
- 500 – Cannot resize container
Start a container
POST /containers/(id)/start
Start the container id
Note: For backwards compatibility, this endpoint accepts a
HostConfig
as JSON-encoded request body. See create a container for details.
Example request:
POST /containers/(id)/start HTTP/1.1
Example response:
HTTP/1.1 204 No Content
Status Codes:
- 204 – no error
- 304 – container already started
- 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 No Content
Query Parameters:
- t – number of seconds to wait before killing the container
Status Codes:
- 204 – no error
- 304 – container already stopped
- 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
Query Parameters
- signal - Signal to send to the container: integer or string like "SIGINT". When not set, SIGKILL is assumed and the call will waits for the container to exit.
Status Codes:
- 204 – no error
- 404 – no such container
- 500 – server error
Rename a container
POST /containers/(id)/rename
Rename the container id
to a new_name
Example request:
POST /containers/e90e34656806/rename?name=new_name HTTP/1.1
Example response:
HTTP/1.1 204 No Content
Query Parameters:
- name – new name for the container
Status Codes:
- 204 – no error
- 404 – no such container
- 409 - conflict name already assigned
- 500 – server error
Pause a container
POST /containers/(id)/pause
Pause the container id
Example request:
POST /containers/e90e34656806/pause HTTP/1.1
Example response:
HTTP/1.1 204 No Content
Status Codes:
- 204 – no error
- 404 – no such container
- 500 – server error
Unpause a container
POST /containers/(id)/unpause
Unpause the container id
Example request:
POST /containers/e90e34656806/unpause 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/1.1 101 UPGRADED
Content-Type: application/vnd.docker.raw-stream
Connection: Upgrade
Upgrade: tcp
{{ 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:
-
101 – no error, hints proxy about hijacking
-
200 – no error, no upgrade header found
-
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:
- Read 8 bytes
- chose stdout or stderr depending on the first byte
- Extract the frame size from the last 4 bytes
- Read the extracted size and output it on the correct output
- 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
- force - 1/True/true or 0/False/false, Kill then remove 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/x-tar
{{ 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
}
]
Example request, with digest information:
GET /images/json?digests=1 HTTP/1.1
Example response, with digest information:
HTTP/1.1 200 OK
Content-Type: application/json
[
{
"Created": 1420064636,
"Id": "4986bf8c15363d1c5d15512d5266f8777bfba4974ac56e3270e7760f6f0a8125",
"ParentId": "ea13149945cb6b1e746bf28032f02e9b5a793523481a0a18645fc77ad53c4ea2",
"RepoDigests": [
"localhost:5000/test/busybox@sha256:cbbf2f9a99b47fc460d422812b6a5adff7dfee951d8fa2e4a98caa0382cfbdbf"
],
"RepoTags": [
"localhost:5000/test/busybox:latest",
"playdate:latest"
],
"Size": 0,
"VirtualSize": 2429728
}
]
The response shows a single image Id
associated with two repositories
(RepoTags
): localhost:5000/test/busybox
: and playdate
. A caller can use
either of the RepoTags
values localhost:5000/test/busybox:latest
or
playdate:latest
to reference the image.
You can also use RepoDigests
values to reference an image. In this response,
the array has only one reference and that is to the
localhost:5000/test/busybox
repository; the playdate
repository has no
digest. You can reference this digest using the value:
localhost:5000/test/busybox@sha256:cbbf2f9a99b47fc460d...
See the docker run
and docker build
commands for examples of digest and tag
references on the command line.
Query Parameters:
- all – 1/True/true or 0/False/false, default false
- filters – a json encoded value of the filters (a map[string][]string) to process on the images list. Available filters:
- dangling=true
- label=
key
orlabel="key=value"
of an image label - filter - only return images with the specified name
Build image from a Dockerfile
POST /build
Build an image from a Dockerfile
Example request:
POST /build HTTP/1.1
{{ TAR STREAM }}
Example response:
HTTP/1.1 200 OK
Content-Type: application/json
{"stream": "Step 1..."}
{"stream": "..."}
{"error": "Error...", "errorDetail": {"code": 123, "message": "Error..."}}
The input stream must be a tar archive compressed with one of the following algorithms: identity (no compression), gzip, bzip2, xz.
The archive must include a build instructions file, typically called
Dockerfile
at the root of the archive. The dockerfile
parameter may be
used to specify a different build instructions file by having its value be
the path to the alternate build instructions file to use.
The archive may include any number of other files, which will be accessible in the build context (See the ADD build command).
The build will also be canceled if the client drops the connection by quitting or being killed.
Query Parameters:
-
dockerfile - path within the build context to the Dockerfile. This is ignored if
remote
is specified and points to an individual filename. -
t – repository name (and optionally a tag) to be applied to the resulting image in case of success
-
remote – A Git repository URI or HTTP/HTTPS URI build source. If the URI specifies a filename, the file's contents are placed into a file called
Dockerfile
. -
q – suppress verbose build output
-
nocache – do not use the cache when building the image
-
pull - attempt to pull the image even if an older image exists locally
-
rm - remove intermediate containers after a successful build (default behavior)
-
forcerm - always remove intermediate containers (includes rm)
-
memory - set memory limit for build
-
memswap - Total memory (memory + swap),
-1
to disable swap -
cpushares - CPU shares (relative weight)
-
cpusetcpus - CPUs in which to allow execution, e.g.,
0-3
,0,1
Request Headers:
-
Content-type – should be set to
"application/tar"
. -
X-Registry-Config – base64-encoded ConfigFile object
Status Codes:
- 200 – no error
- 500 – server error
Create an image
POST /images/create
Create an image, either by pulling it from the registry or by importing it
Example request:
POST /images/create?fromImage=ubuntu HTTP/1.1
Example response:
HTTP/1.1 200 OK
Content-Type: application/json
{"status": "Pulling..."}
{"status": "Pulling", "progress": "1 B/ 100 B", "progressDetail": {"current": 1, "total": 100}}
{"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. The value may be a URL from which the image can be retrieved or
-
to read the image from the request body. -
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
Inspect an image
GET /images/(name)/json
Return low-level information on the image name
Example request:
GET /images/ubuntu/json HTTP/1.1
Example response:
HTTP/1.1 200 OK
Content-Type: application/json
{
"Created": "2013-03-23T22:24:18.818426-07:00",
"Container": "3d67245a8d72ecf13f33dffac9f79dcdf70f75acb84d308770391510e0c23ad0",
"ContainerConfig":
{
"Hostname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"PortSpecs": null,
"Tty": true,
"OpenStdin": true,
"StdinOnce": false,
"Env": null,
"Cmd": ["/bin/bash"],
"Dns": null,
"Image": "ubuntu",
"Labels": {
"com.example.vendor": "Acme",
"com.example.license": "GPL",
"com.example.version": "1.0"
},
"Volumes": null,
"VolumesFrom": "",
"WorkingDir": ""
},
"Id": "b750fe79269d2ec9a3c593ef05b4332b1d1a02a62b4accb2c21d589ff2f5f2dc",
"Parent": "27cf784147099545",
"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/ubuntu/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)", "progressDetail": {"current": 1}}}
{"error": "Invalid..."}
...
If you wish to push an image on to a private registry, that image must already have been tagged
into a repository which references that registry host name and port. This repository name should
then be used in the URL. This mirrors the flow of the CLI.
Example request:
POST /images/registry.acme.com:5000/test/push HTTP/1.1
Query Parameters:
- tag – the tag to associate with the image on the registry, optional
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"}
]
Query Parameters:
- force – 1/True/true or 0/False/false, default false
- noprune – 1/True/true or 0/False/false, default false
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_automated": false,
"name": "wma55/u1210sshd",
"star_count": 0
},
{
"description": "",
"is_official": false,
"is_automated": false,
"name": "jdswinbank/sshd",
"star_count": 0
},
{
"description": "",
"is_official": false,
"is_automated": false,
"name": "vgauthier/sshd",
"star_count": 0
}
...
]
Query Parameters:
- term – term to search
Status Codes:
- 200 – no error
- 500 – server error
2.3 Misc
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
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,
"Debug": 0,
"DockerRootDir": "/var/lib/docker",
"Driver": "btrfs",
"DriverStatus": [[""]],
"ExecutionDriver": "native-0.1",
"HttpProxy": "http://test:test@localhost:8080",
"HttpsProxy": "https://test:test@localhost:8080",
"ID": "7TRN:IPZB:QYBB:VPBQ:UMPP:KARE:6ZNR:XE6T:7EWV:PKF4:ZOJD:TPYS",
"IPv4Forwarding": 1,
"Images": 16,
"IndexServerAddress": "https://index.docker.io/v1/",
"InitPath": "/usr/bin/docker",
"InitSha1": "",
"KernelVersion": "3.12.0-1-amd64",
"Labels": [
"storage=ssd"
],
"MemTotal": 2099236864,
"MemoryLimit": 1,
"NCPU": 1,
"NEventsListener": 0,
"NFd": 11,
"NGoroutines": 21,
"Name": "prod-server-42",
"NoProxy": "9.81.1.160",
"OperatingSystem": "Boot2Docker",
"RegistryConfig": {
"IndexConfigs": {
"docker.io": {
"Mirrors": null,
"Name": "docker.io",
"Official": true,
"Secure": true
}
},
"InsecureRegistryCIDRs": [
"127.0.0.0/8"
]
},
"SwapLimit": 0,
"SystemTime": "2015-03-10T11:11:23.730591467-07:00"
}
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": "1.5.0",
"Os": "linux",
"KernelVersion": "3.18.5-tinycore64",
"GoVersion": "go1.4.1",
"GitCommit": "a8a31ef",
"Arch": "amd64",
"ApiVersion": "1.18"
}
Status Codes:
- 200 – no error
- 500 – server error
Ping the docker server
GET /_ping
Ping the docker server
Example request:
GET /_ping HTTP/1.1
Example response:
HTTP/1.1 200 OK
Content-Type: text/plain
OK
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&comment=message&repo=myrepo HTTP/1.1
Content-Type: application/json
{
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": true,
"AttachStderr": true,
"PortSpecs": null,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": null,
"Cmd": [
"date"
],
"Volumes": {
"/tmp": {}
},
"WorkingDir": "",
"NetworkDisabled": false,
"ExposedPorts": {
"22/tcp": {}
}
}
Example response:
HTTP/1.1 201 Created
Content-Type: application/vnd.docker.raw-stream
{"Id": "596069db4bf5"}
Json Parameters:
- config - the container's configuration
Query Parameters:
- container – source container
- repo – repository
- tag – tag
- comment – commit message
- author – author (e.g., "John Hannibal Smith <hannibal@a-team.com>")
Status Codes:
- 201 – no error
- 404 – no such container
- 500 – server error
Monitor Docker's events
GET /events
Get container events from docker, either in real time via streaming, or via polling (using since).
Docker containers will report the following events:
create, destroy, die, exec_create, exec_start, export, kill, oom, 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": "ubuntu:latest", "time":1374067924}
{"status": "start", "id": "dfdf82bd3881","from": "ubuntu:latest", "time":1374067924}
{"status": "stop", "id": "dfdf82bd3881","from": "ubuntu:latest", "time":1374067966}
{"status": "destroy", "id": "dfdf82bd3881","from": "ubuntu:latest", "time":1374067970}
Query Parameters:
- since – timestamp used for polling
- until – timestamp used for polling
- filters – a json encoded value of the filters (a map[string][]string) to process on the event list. Available filters:
- event=<string> -- event to filter
- image=<string> -- image to filter
- container=<string> -- container to filter
Status Codes:
- 200 – no error
- 500 – server error
Get a tarball containing all images in a repository
GET /images/(name)/get
Get a tarball containing all images and metadata for the repository specified
by name
.
If name
is a specific name and tag (e.g. ubuntu:latest), then only that image
(and its parents) are returned. If name
is an image ID, similarly only that
image (and its parents) are returned, but with the exclusion of the
'repositories' file in the tarball, as there were no image names referenced.
See the image tarball format for more details.
Example request
GET /images/ubuntu/get
Example response:
HTTP/1.1 200 OK
Content-Type: application/x-tar
Binary data stream
Status Codes:
- 200 – no error
- 500 – server error
Get a tarball containing all images.
GET /images/get
Get a tarball containing all images and metadata for one or more repositories.
For each value of the names
parameter: if it is a specific name and tag (e.g.
ubuntu:latest), then only that image (and its parents) are returned; if it is
an image ID, similarly only that image (and its parents) are returned and there
would be no names referenced in the 'repositories' file for this image ID.
See the image tarball format for more details.
Example request
GET /images/get?names=myname%2Fmyapp%3Alatest&names=busybox
Example response:
HTTP/1.1 200 OK
Content-Type: application/x-tar
Binary data stream
Status Codes:
- 200 – no error
- 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. See the image tarball format for more details.
Example request
POST /images/load
Tarball in body
Example response:
HTTP/1.1 200 OK
Status Codes:
- 200 – no error
- 500 – server error
Image tarball format
An image tarball contains one directory per image layer (named using its long ID), each containing three files:
VERSION
: currently1.0
- the file format versionjson
: detailed layer information, similar todocker inspect layer_id
layer.tar
: A tarfile containing the filesystem changes in this layer
The layer.tar
file will contain aufs
style .wh..wh.aufs
files and directories
for storing attribute changes and deletions.
If the tarball defines a repository, there will also be a repositories
file at
the root that contains a list of repository and tag names mapped to layer IDs.
{"hello-world":
{"latest": "565a9d68a73f6706862bfe8409a7f659776d4d60a8d096eb4a3cbce6999cc2a1"}
}
Exec Create
POST /containers/(id)/exec
Sets up an exec instance in a running container id
Example request:
POST /containers/e90e34656806/exec HTTP/1.1
Content-Type: application/json
{
"AttachStdin": false,
"AttachStdout": true,
"AttachStderr": true,
"Tty": false,
"Cmd": [
"date"
],
}
Example response:
HTTP/1.1 201 OK
Content-Type: application/json
{
"Id": "f90e34656806"
"Warnings":[]
}
Json Parameters:
- AttachStdin - Boolean value, attaches to stdin of the exec command.
- AttachStdout - Boolean value, attaches to stdout of the exec command.
- AttachStderr - Boolean value, attaches to stderr of the exec command.
- Tty - Boolean value to allocate a pseudo-TTY
- Cmd - Command to run specified as a string or an array of strings.
Status Codes:
- 201 – no error
- 404 – no such container
Exec Start
POST /exec/(id)/start
Starts a previously set up exec instance id
. If detach
is true, this API
returns after starting the exec
command. Otherwise, this API sets up an
interactive session with the exec
command.
Example request:
POST /exec/e90e34656806/start HTTP/1.1
Content-Type: application/json
{
"Detach": false,
"Tty": false,
}
Example response:
HTTP/1.1 201 OK
Content-Type: application/json
{{ STREAM }}
Json Parameters:
- Detach - Detach from the exec command
- Tty - Boolean value to allocate a pseudo-TTY
Status Codes:
-
201 – no error
-
404 – no such exec instance
Stream details: Similar to the stream behavior of
POST /container/(id)/attach
API
Exec Resize
POST /exec/(id)/resize
Resizes the tty session used by the exec command id
.
This API is valid only if tty
was specified as part of creating and starting the exec command.
Example request:
POST /exec/e90e34656806/resize HTTP/1.1
Content-Type: text/plain
Example response:
HTTP/1.1 201 OK
Content-Type: text/plain
Query Parameters:
- h – height of tty session
- w – width
Status Codes:
- 201 – no error
- 404 – no such exec instance
Exec Inspect
GET /exec/(id)/json
Return low-level information about the exec command id
.
Example request:
GET /exec/11fb006128e8ceb3942e7c58d77750f24210e35f879dd204ac975c184b820b39/json HTTP/1.1
Example response:
HTTP/1.1 200 OK
Content-Type: plain/text
{
"ID" : "11fb006128e8ceb3942e7c58d77750f24210e35f879dd204ac975c184b820b39",
"Running" : false,
"ExitCode" : 2,
"ProcessConfig" : {
"privileged" : false,
"user" : "",
"tty" : false,
"entrypoint" : "sh",
"arguments" : [
"-c",
"exit 2"
]
},
"OpenStdin" : false,
"OpenStderr" : false,
"OpenStdout" : false,
"Container" : {
"State" : {
"Running" : true,
"Paused" : false,
"Restarting" : false,
"OOMKilled" : false,
"Pid" : 3650,
"ExitCode" : 0,
"Error" : "",
"StartedAt" : "2014-11-17T22:26:03.717657531Z",
"FinishedAt" : "0001-01-01T00:00:00Z"
},
"ID" : "8f177a186b977fb451136e0fdf182abff5599a08b3c7f6ef0d36a55aaf89634c",
"Created" : "2014-11-17T22:26:03.626304998Z",
"Path" : "date",
"Args" : [],
"Config" : {
"Hostname" : "8f177a186b97",
"Domainname" : "",
"User" : "",
"AttachStdin" : false,
"AttachStdout" : false,
"AttachStderr" : false,
"PortSpecs" : null,
"ExposedPorts" : null,
"Tty" : false,
"OpenStdin" : false,
"StdinOnce" : false,
"Env" : [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" ],
"Cmd" : [
"date"
],
"Image" : "ubuntu",
"Volumes" : null,
"WorkingDir" : "",
"Entrypoint" : null,
"NetworkDisabled" : false,
"MacAddress" : "",
"OnBuild" : null,
"SecurityOpt" : null
},
"Image" : "5506de2b643be1e6febbf3b8a240760c6843244c41e12aa2f60ccbb7153d17f5",
"NetworkSettings" : {
"IPAddress" : "172.17.0.2",
"IPPrefixLen" : 16,
"MacAddress" : "02:42:ac:11:00:02",
"Gateway" : "172.17.42.1",
"Bridge" : "docker0",
"PortMapping" : null,
"Ports" : {}
},
"ResolvConfPath" : "/var/lib/docker/containers/8f177a186b977fb451136e0fdf182abff5599a08b3c7f6ef0d36a55aaf89634c/resolv.conf",
"HostnamePath" : "/var/lib/docker/containers/8f177a186b977fb451136e0fdf182abff5599a08b3c7f6ef0d36a55aaf89634c/hostname",
"HostsPath" : "/var/lib/docker/containers/8f177a186b977fb451136e0fdf182abff5599a08b3c7f6ef0d36a55aaf89634c/hosts",
"LogPath": "/var/lib/docker/containers/1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b/1eb5fabf5a03807136561b3c00adcd2992b535d624d5e18b6cdc6a6844d9767b-json.log",
"Name" : "/test",
"Driver" : "aufs",
"ExecDriver" : "native-0.2",
"MountLabel" : "",
"ProcessLabel" : "",
"AppArmorProfile" : "",
"RestartCount" : 0,
"Volumes" : {},
"VolumesRW" : {}
}
}
Status Codes:
- 200 – no error
- 404 – no such exec instance
- 500 - server error
3. Going further
3.1 Inside docker run
As an example, the docker run
command line makes the following API calls:
-
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.
To hint potential proxies about connection hijacking, Docker client sends connection upgrade headers similarly to websocket.
Upgrade: tcp
Connection: Upgrade
When Docker daemon detects the Upgrade
header, it will switch its status code
from 200 OK to 101 UPGRADED and resend the same headers.
This might change in the future.
3.3 CORS Requests
To set cross origin requests to the remote api please give values to "--api-cors-header" when running docker in daemon mode. Set * will allow all, default or blank means CORS disabled
$ docker -d -H="192.168.1.9:2375" --api-cors-header="http://foo.bar"