gem-hunter
Language: Java
INACTIVE: A simple docker client for the JVM
Spotify no longer uses recent versions of this project internally. The version of docker-client we're using is whatever helios has in its pom.xml. At this point, we're not developing or accepting new features or even fixing non-critical bugs. Feel free to fork this repo though.
This is a Docker client written in Java. It is used in many critical production systems at Spotify.
docker-client is built and tested against the six most recent minor releases of Docker.
Right now these are 17.03.1ce - 17.12.1ce (specifically the ones here).
We upload the artifact tested on Docker 17.12.1~ce.
See Docker docs on the mapping between Docker version and API version.
Download the latest JAR or grab via Maven.
<dependency> <groupId>com.spotify</groupId> <artifactId>docker-client</artifactId> <version>LATEST-VERSION</version> </dependency>
// Create a client based on DOCKER_HOST and DOCKER_CERT_PATH env vars final DockerClient docker = DefaultDockerClient.fromEnv().build(); // Pull an image docker.pull("busybox"); // Bind container ports to host ports final String[] ports = {"80", "22"}; final Map<String, List<PortBinding>> portBindings = new HashMap<>(); for (String port : ports) { List<PortBinding> hostPorts = new ArrayList<>(); hostPorts.add(PortBinding.of("0.0.0.0", port)); portBindings.put(port, hostPorts); } // Bind container port 443 to an automatically allocated available host port. List<PortBinding> randomPort = new ArrayList<>(); randomPort.add(PortBinding.randomPort("0.0.0.0")); portBindings.put("443", randomPort); final HostConfig hostConfig = HostConfig.builder().portBindings(portBindings).build(); // Create container with exposed ports final ContainerConfig containerConfig = ContainerConfig.builder() .hostConfig(hostConfig) .image("busybox").exposedPorts(ports) .cmd("sh", "-c", "while :; do sleep 1; done") .build(); final ContainerCreation creation = docker.createContainer(containerConfig); final String id = creation.id(); // Inspect container final ContainerInfo info = docker.inspectContainer(id); // Start container docker.startContainer(id); // Exec command inside running container with attached STDOUT and STDERR final String[] command = {"sh", "-c", "ls"}; final ExecCreation execCreation = docker.execCreate( id, command, DockerClient.ExecCreateParam.attachStdout(), DockerClient.ExecCreateParam.attachStderr()); final LogStream output = docker.execStart(execCreation.id()); final String execOutput = output.readFully(); // Kill container docker.killContainer(id); // Remove container docker.removeContainer(id); // Close the docker client docker.close();
If you're looking for how to use docker-client, see the User Manual. If you're looking for how to build and develop it, keep reading.
docker-client should be buildable on any platform with Docker 1.6+, JDK8+, and a recent version of Maven 3.
If you are using Docker for Mac and DefaultDockerClient.fromEnv(), it might not be clear
what value to use for the DOCKER_HOST environment variable. The value you should use is
DOCKER_HOST=unix:///var/run/docker.sock, at least as of version 1.11.1-beta11.
As of version 4.0.8 of docker-client, DefaultDockerClient.fromEnv() uses
unix:///var/run/docker.sock on OS X by default.
If you're running a recent version of docker (>= 1.12), which contains native swarm support, please
ensure that you run docker swarm init to initialize the docker swarm.
Make sure Docker daemon is running and that you can do docker ps.
You can run tests on their own with mvn test. Note that the tests start and stop a large number of
containers, so the list of containers you see with docker ps -a will start to get pretty long
after many test runs. You may find it helpful to occasionally issue docker rm $(docker ps -aq).
Commits to the master branch will trigger our continuous integration agent to build the jar and release by uploading to Sonatype. If you are a project maintainer with the necessary credentials, you can also build and release locally by running the below.
mvn clean [-DskipTests -Darguments=-DskipTests] -Dgpg.keyname=<key ID used for signing artifacts> release:prepare release:perform
Please note that in releases 2.7.6 and earlier, the default artifact was the shaded version. When upgrading to version 2.7.7, you will need to include the shaded classifier if you relied on the shaded dependencies in the docker-client jar.
Standard:
<dependency> <groupId>com.spotify</groupId> <artifactId>docker-client</artifactId> <version>3.5.12</version> </dependency>
Shaded:
<dependency> <groupId>com.spotify</groupId> <artifactId>docker-client</artifactId> <classifier>shaded</classifier> <version>3.5.12</version> </dependency>
This is particularly important if you use Jersey 1.x in your project. To avoid conflicts with docker-client and Jersey 2.x, you will need to explicitly specify the shaded version above.
This project adheres to the Open Code of Conduct. By participating, you are expected to honor this code.