bollard 0.1.2

Bollard: an asynchronous rust client library for the docker API

Bollard leverages the latest Hyper and Tokio improvements for an asynchronous API containing futures and streams.

The library also features Windows support through Named Pipes and HTTPS support through optional SSL bindings or a native TLS implementation.

Install

Add the following to your Cargo.toml file

[dependencies]
bollard = "0.1"

API documentation

API docs

Usage

Connecting with the docker daemon

Connect to the docker server according to your architecture and security remit.

Unix socket

The client will connect to the standard unix socket location /var/run/docker.sock. Use the Docker::connect_with_unix method API to parameterise the interface.

use bollard::Docker;
#[cfg(unix)]
Docker::connect_with_unix_defaults();

Windows named pipe

The client will connect to the standard windows pipe location \\.\pipe\docker_engine. Use the Docker::connect_with_name_pipe method API to parameterise the interface.

use bollard::Docker;
#[cfg(windows)]
Docker::connect_with_named_pipe_defaults();

HTTP

The client will connect to the location pointed to by DOCKER_HOST environment variable, or localhost:2375 if missing. Use the Docker::connect_with_http method API to parameterise the interface.

use bollard::Docker;
Docker::connect_with_http_defaults();

SSL via openssl

Openssl is switched off by default, and can be enabled through the ssl cargo feature.

The client will connect to the location pointed to by DOCKER_HOST environment variable, or localhost:2375 if missing.

The location pointed to by the DOCKER_CERT_PATH environment variable is searched for certificates - key.pem for the private key, cert.pem for the server certificate and ca.pem for the certificate authority chain.

Use the Docker::connect_with_ssl method API to parameterise the interface.

use bollard::Docker;
#[cfg(feature = "openssl")]
Docker::connect_with_ssl_defaults();

TLS

Native TLS allows you to avoid the SSL bindings.

The client will connect to the location pointed to by DOCKER_HOST environment variable, or localhost:2375 if missing.

The location pointed to by the DOCKER_CERT_PATH environment variable is searched for certificates - identity.pfx for the PKCS #12 archive and ca.pem for the certificate authority chain.

Use the Docker::connect_with_ssl method API to parameterise the interface.

use bollard::Docker;
Docker::connect_with_tls_defaults();

Examples

Note: all these examples need a Tokio Runtime. A small example about how to use Tokio is below.

Version

First, check that the API is working with your server:

use futures::Future;

use bollard::Docker;

// Use a connection function described above
// let docker = Docker::connect_...;

docker.version()
    .map(|version| {
        println!("{:?}", version);
    });

Listing images

To list docker images available on the Docker server:

use futures::Future;

use bollard::Docker;
use bollard::image::ListImagesOptions;

use std::default::Default;

// Use a connection function described above
// let docker = Docker::connect_...;

docker.list_images(Some(ListImagesOptions::<String> {
   all: true,
   ..Default::default()
}))
  .map(|images| {
       for i in images {
           println!("-> {:?}", i);
       }
   });

Streaming Stats

To receive a stream of stats for a running container.

use futures::stream::Stream;

use bollard::Docker;
use bollard::container::StatsOptions;

use std::default::Default;

// Use a connection function described above
// let docker = Docker::connect_...;

docker.stats("postgres", Some(StatsOptions {
   stream: true,
   ..Default::default()
}))
  .map(|stat| {
        println!("{} - mem total: {:?} | mem usage: {:?}",
            stat.name,
            stat.memory_stats.max_usage,
            stat.memory_stats.usage);
   });

Chaining docker commands

It's sometimes more convenient to chain a string of Docker API calls. The DockerChain API will return an instance of itself in the return call.

use bollard::Docker;
use bollard::image::CreateImageOptions;
use bollard::container::CreateContainerOptions;
use bollard::container::Config;

use tokio::prelude::Future;

use std::default::Default;

// Use a connection function described above
// let docker = Docker::connect_...;
docker.chain().create_image(Some(CreateImageOptions{
    from_image: "hello-world",
    ..Default::default()
})).and_then(|(docker, _)|
    docker.create_container(
        None::<CreateContainerOptions<String>>,
        Config {
            image: Some("hello-world"),
            cmd: vec!["/hello"],
            ..Default::default()
        }));

Examples

Further examples are available in the examples folder, or the integration/unit tests.

A Primer on the Tokio Runtime

In order to use the API effectively, you will need to be familiar with the Tokio Runtime.

Create a Tokio Runtime:

use tokio::runtime::Runtime;

let mut rt = Runtime::new().unwrap();

Subsequently, use the docker API:

// Use a connection function described above
// let docker = Docker::connect_...;
let future = docker.list_images(None::<ListImagesOptions<String>>);

Execute the future aynchronously:

rt.spawn(future);

Or, to execute and receive the result:

let result = rt.block_on(future);

Finally, to shut down the executor:

rt.shutdown_now().wait().unwrap();

History

This library stems from the boondock rust library, which in turn originates from the rust-docker library, but most parts were rewritten to adobt the new functionality provided by tokio. Many thanks to the original authors for the initial code and inspiration.

Integration tests

Running the integration tests by default requires a running docker registry, with images tagged and pushed there. To disable this behaviour, set the DISABLE_REGISTRY environment variable.

docker run -d --restart always --name registry -p 5000:5000 registry:2
docker pull hello-world:linux
docker pull fnichol/uhttpd
docker pull alpine
docker tag hello-world:linux localhost:5000/hello-world:linux
docker tag fnichol/uhttpd localhost:5000/fnichol/uhttpd
docker tag alpine localhost:5000/alpine
docker push localhost:5000/hello-world:linux
docker push localhost:5000/fnichol/uhttpd
docker push localhost:5000/alpine
REGISTRY_HTTP_ADDR=localhost:5000 cargo test --test-threads 1

License: Apache-2.0