docker-java

Java API client for Docker

Supports a subset of the Docker Client API v1.11, Docker Server version 0.11

Developer forum for docker-java

Build with Maven

Prerequisites:

Java 1.6+
Maven 3.0.5
Docker daemon running

Maven may run tests during build process but tests are disabled by default. The tests are using a localhost instance of Docker, make sure that you have Docker running for tests to work. To run the tests you have to provide your https://www.docker.io/account/login/ information:

$ mvn clean install -DskipTests=false -Ddocker.io.username=... -Ddocker.io.password=... -Ddocker.io.email=...

By default Docker server is using UNIX sockets for communication with the Docker client, however docker-java client uses TCP/IP to connect to the Docker server, so you will need to make sure that your Docker server is listening on TCP port. To allow Docker server to use TCP add the following line to /etc/default/docker

DOCKER_OPTS="-H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock"

More details setting up docket server can be found in official documentation: http://docs.docker.io/en/latest/use/basics/

Now make sure that docker is up:

$ docker -H tcp://127.0.0.1:4243 version

Client version: 0.8.1
Go version (client): go1.2
Git commit (client): a1598d1
Server version: 0.8.1
Git commit (server): a1598d1
Go version (server): go1.2
Last stable version: 0.8.1

Run build with tests:

$ mvn clean install

Docker-Java maven dependency:

<dependency>
      <groupId>com.kpelykh</groupId>
      <artifactId>docker-java</artifactId>
      <version>0.8.1</version>
</dependency>

Example code snippets:

DockerClient dockerClient = new DockerClient("http://localhost:4243");

Get Docker info:

Info info = dockerClient.info();
System.out.print(info);

Search Docker repository:

List<SearchItem> dockerSearch = dockerClient.search("busybox");
System.out.println("Search returned" + dockerSearch.toString());

Create new Docker container, wait for its start and stop it:

ContainerConfig containerConfig = new ContainerConfig();
containerConfig.setImage("busybox");
containerConfig.setCmd(new String[] {"touch", "/test"});
ContainerCreateResponse container = dockerClient.createContainer(containerConfig);

dockerClient.startContainer(container.id);

dockerClient.waitContainer(container.id);

dockerClient.stopContainer(container.id);

Support for UNIX sockets:

Support for UNIX socket should appear in docker-java pretty soon. I'm working on its integration.

Docker Builder:

To use Docker Builder, as described on page http://docs.docker.io/en/latest/use/builder/, user dockerClient.build(baseDir), where baseDir is a path to folder containing Dockerfile.

File baseDir = new File("~/kpelykh/docker/netcat");

ClientResponse response = dockerClient.build(baseDir);

StringWriter logwriter = new StringWriter();

try {
    LineIterator itr = IOUtils.lineIterator(response.getEntityInputStream(), "UTF-8");
    while (itr.hasNext()) {
        String line = itr.next();
        logwriter.write(line);
        LOG.info(line);
    }
} finally {
    IOUtils.closeQuietly(response.getEntityInputStream());
}

For additional examples, please look at DockerClientTest.java

Configuration

There are a couple of configuration items, all of which have sensible defaults:

url The Docker URL, e.g. http://localhost:4243.
version The API version, e.g. 1.11.
username Your repository username (required to push containers).
password Your repository password.
email Your repository email.

There are three ways to configure, in descending order of precedence:

Programatic:

In your application, e.g.

DockerClient docker = new DockerClient("http://localhost:4243");
docker.setCredentials("dockeruser", "ilovedocker", "dockeruser@github.com");`

System Properties:

E.g.

java -Ddocker.io.username=kpelykh pkg.Main

File System

In $HOME/.docker.io.properties, e.g.:

docker.io.username=dockeruser

Class Path

In the class path at /docker.io.properties, e.g.:

docker.io.url=http://localhost:4243
docker.io.version=1.11

perlchild/docker-java