Develop with Docker Engine SDKs and API
Estimated reading time: 12 minutesDocker provides an API for interacting with the Docker daemon (called the Docker Engine API), as well as SDKs for Go and Python. The SDKs allow you to build and scale Docker apps and solutions quickly and easily. If Go or Python don’t work for you, you can use the Docker Engine API directly.
The Docker Engine API is a RESTful API accessed by an HTTP client such as wget
or
curl
, or the HTTP library which is part of most modern programming languages.
Install the SDKs
Use the following commands to install the Go or Python SDK. Both SDKs can be installed and coexist together.
Go SDK
go get github.com/docker/docker/client
The client requires a recent version of Go. Run go version
and ensure that you
are running at least version 1.9.4 of Go
Read the full Docker Engine Go SDK reference.
Python SDK
-
Recommended: Run
pip install docker
. -
If you can’t use
pip
:- Download the package directly.
- Extract it and change to the extracted directory,
- Run
python setup.py install
.
Read the full Docker Engine Python SDK reference.
View the API reference
You can view the reference for the latest version of the API or choose a specific version.
Versioned API and SDK
The version of the Docker Engine API you should use depends upon the version of your Docker daemon and Docker client.
A given version of the Docker Engine SDK supports a specific version of the Docker Engine API, as well as all earlier versions. If breaking changes occur, they are documented prominently.
Daemon and client API mismatches
The Docker daemon and client do not necessarily need to be the same version at all times. However, keep the following in mind.
If the daemon is newer than the client, the client does not know about new features or deprecated API endpoints in the daemon.
If the client is newer than the daemon, the client can request API endpoints that the daemon does not know about.
A new version of the API is released when new features are added. The Docker API is backward-compatible, so you do not need to update code that uses the API unless you need to take advantage of new features.
To see the highest version of the API your Docker daemon and client support, use
docker version
:
$ docker version
Client:
Version: 17.04.0-ce
API version: 1.28
Go version: go1.7.5
Git commit: 4845c56
Built: Wed Apr 5 06:06:36 2017
OS/Arch: darwin/amd64
Server:
Version: 17.04.0-ce
API version: 1.28 (minimum version 1.12)
Go version: go1.7.5
Git commit: 4845c56
Built: Tue Apr 4 00:37:25 2017
OS/Arch: linux/amd64
Experimental: true
You can specify the API version to use, in one of the following ways:
-
When using the SDK, use the latest version you can, but at least the version that incorporates the API version with the features you need.
-
When using
curl
directly, specify the version as the first part of the URL. For instance, if the endpoint is/containers/
, you can use/v1.27/containers/
. -
To force the Docker CLI or the Docker Engine SDKs to use an old version version of the API than the version reported by
docker version
, set the environment variableDOCKER_API_VERSION
to the correct version. This works on Linux, Windows, or macOS clients.DOCKER_API_VERSION='1.27'
While the environment variable is set, that version of the API is used, even if the Docker daemon supports a newer version.
-
For the SDKs, you can also specify the API version programmatically, as a parameter to the
client
object. See the Go constructor or the Python SDK documentation forclient
.
Docker EE and CE API mismatch
If you use Docker EE in production, we recommend using Docker EE in development too. If you can’t, such as when your developers use Docker Desktop for Mac or Docker Desktop for Windows and manually build and push images, then your developers need to configure their Docker clients to use the same version of the API reported by their Docker daemon. This prevents the developer from using a feature that is not yet supported on the daemon where the workload runs in production. You can do this one of two ways:
- Configure the Docker client to connect to an external daemon running Docker EE.
You can use the
-H
flag on thedocker
command or set theDOCKER_HOST
environment variable. The client uses the daemon’s latest supported API version. - Configure the Docker client to use a specific API by setting the
DOCKER_API_VERSION
environment variable to the API version to use, such as1.30
.
API version matrix
Docker does not recommend running versions prior to 1.12, which means you are encouraged to use an API version of 1.24 or higher.
Docker version | Maximum API version | Change log |
---|---|---|
18.09 | 1.39 | changes |
18.06 | 1.38 | changes |
18.05 | 1.37 | changes |
18.04 | 1.37 | changes |
18.03 | 1.37 | changes |
18.02 | 1.36 | changes |
17.12 | 1.35 | changes |
17.11 | 1.34 | changes |
17.10 | 1.33 | changes |
17.09 | 1.32 | changes |
17.07 | 1.31 | changes |
17.06 | 1.30 | changes |
17.05 | 1.29 | changes |
17.04 | 1.28 | changes |
17.03.1 | 1.27 | changes |
17.03 | 1.26 | changes |
1.13.1 | 1.26 | changes |
1.13 | 1.25 | changes |
1.12 | 1.24 | changes |
1.11 | 1.23 | changes |
1.10 | 1.22 | changes |
1.9 | 1.21 | changes |
1.8 | 1.20 | changes |
1.7 | 1.19 | changes |
1.6 | 1.18 | changes |
Choose the SDK or API version to use
Use the following guidelines to choose the SDK or API version to use in your code:
- If you’re starting a new project, use the latest version, but do specify the version you are using. This helps prevent surprises.
- If you need a new feature, update your code to use at least the minimum version that supports the feature, and prefer the latest version you can use.
- Otherwise, continue to use the version that your code is already using.
SDK and API quickstart
As an example, the docker run
command can be easily implemented using the
Docker API directly, or using the Python or Go SDK.
package main
import (
"context"
"os"
"github.com/docker/docker/client"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/pkg/stdcopy"
)
func main() {
ctx := context.Background()
cli, err := client.NewClientWithOpts(client.FromEnv)
if err != nil {
panic(err)
}
cli.NegotiateAPIVersion(ctx)
reader, err := cli.ImagePull(ctx, "docker.io/library/alpine", types.ImagePullOptions{})
if err != nil {
panic(err)
}
io.Copy(os.Stdout, reader)
resp, err := cli.ContainerCreate(ctx, &container.Config{
Image: "alpine",
Cmd: []string{"echo", "hello world"},
}, nil, nil, "")
if err != nil {
panic(err)
}
if err := cli.ContainerStart(ctx, resp.ID, types.ContainerStartOptions{}); err != nil {
panic(err)
}
statusCh, errCh := cli.ContainerWait(ctx, resp.ID, container.WaitConditionNotRunning)
select {
case err := <-errCh:
if err != nil {
panic(err)
}
case <-statusCh:
}
out, err := cli.ContainerLogs(ctx, resp.ID, types.ContainerLogsOptions{ShowStdout: true})
if err != nil {
panic(err)
}
stdcopy.StdCopy(os.Stdout, os.Stderr, out)
}
import docker
client = docker.from_env()
print client.containers.run("alpine", ["echo", "hello", "world"])
$ curl --unix-socket /var/run/docker.sock -H "Content-Type: application/json" \
-d '{"Image": "alpine", "Cmd": ["echo", "hello world"]}' \
-X POST http:/v1.24/containers/create
{"Id":"1c6594faf5","Warnings":null}
$ curl --unix-socket /var/run/docker.sock -X POST http:/v1.24/containers/1c6594faf5/start
$ curl --unix-socket /var/run/docker.sock -X POST http:/v1.24/containers/1c6594faf5/wait
{"StatusCode":0}
$ curl --unix-socket /var/run/docker.sock "http:/v1.24/containers/1c6594faf5/logs?stdout=1"
hello world
For more examples, take a look at the getting started guide.
Unofficial libraries
There are a number of community supported libraries available for other languages. They have not been tested by Docker, so if you run into any issues, file them with the library maintainers.
Language | Library |
---|---|
C | libdocker |
C# | Docker.DotNet |
C++ | lasote/docker_client |
Dart | bwu_docker |
Erlang | erldocker |
Gradle | gradle-docker-plugin |
Groovy | docker-client |
Haskell | docker-hs |
HTML (Web Components) | docker-elements |
Java | docker-client |
Java | docker-java |
Java | docker-java-api |
NodeJS | dockerode |
NodeJS | harbor-master |
Perl | Eixo::Docker |
PHP | Docker-PHP |
Ruby | docker-api |
Rust | docker-rust |
Rust | shiplift |
Scala | tugboat |
Scala | reactive-docker |
Swift | docker-client-swift |