dockerode

Docker Remote API module.

dockerode

Not another Node.js Docker Remote API module.

Why dockerode is different from other Docker node.js modules:

  • streams - dockerode does NOT break any stream, it passes them to you allowing for some stream voodoo.
  • stream demux - Supports optional demultiplexing.
  • entities - containers, images and execs are defined entities and not random static methods.
  • run - dockerode allow you to seamless run commands in a container ala docker run.
  • tests - dockerode really aims to have a good test set, allowing to follow Docker changes easily, quickly and painlessly.
  • feature-rich - There's a real effort in keeping All Docker Remote API features implemented and tested.

npm install dockerode

  • Input options are directly passed to Docker. Check Docker Remote API documentation for more details.
  • Return values are unchanged from Docker, official Docker documentation will also apply to them.
  • Check the tests and examples folder for more examples.

To use dockerode first you need to instantiate it:

var Docker = require('dockerode');
var docker = new Docker({socketPath: '/var/run/docker.sock'});
var docker1 = new Docker(); //defaults to above if env variables are not used 
var docker2 = new Docker({host: 'http://192.168.1.10', port: 3000});
var docker3 = new Docker({protocol:'http', host: '127.0.0.1', port: 3000});
var docker4 = new Docker({host: '127.0.0.1', port: 3000}); //defaults to http 
 
//protocol http vs https is automatically detected 
var docker5 = new Docker({
  host: '192.168.1.10',
  port: process.env.DOCKER_PORT || 2375,
  ca: fs.readFileSync('ca.pem'),
  cert: fs.readFileSync('cert.pem'),
  key: fs.readFileSync('key.pem')
});
 
var docker6 = new Docker({
  protocol: 'https', //you can enforce a protocol 
  host: '192.168.1.10',
  port: process.env.DOCKER_PORT || 2375,
  ca: fs.readFileSync('ca.pem'),
  cert: fs.readFileSync('cert.pem'),
  key: fs.readFileSync('key.pem')
});
//... 
// create a container entity. does not query API 
var container = docker.getContainer('71501a8ab0f8');
 
// query API for container info 
container.inspect(function (errdata) {
  console.log(data);
});
 
container.start(function (errdata) {
  console.log(data);
});
 
container.remove(function (errdata) {
  console.log(data);
});
 
//... 

You may also specify default options for each container's operations, which will always be used for the specified container and operation.

container.defaultOptions.start.Binds = ["/tmp:/tmp:rw"];
docker.listContainers(function (errcontainers) {
  containers.forEach(function (containerInfo) {
    docker.getContainer(containerInfo.Id).stop(cb);
  });
});
docker.buildImage('archive.tar', {t: imageName}, function (errresponse){
  //... 
});
docker.createContainer({Image: 'ubuntu', Cmd: ['/bin/bash'], name: 'ubuntu-test'}, function (errcontainer) {
  container.start(function (errdata) {
    //... 
  });
});
//... 
//tty:true 
docker.createContainer({ /*...*/ Tty: true /*...*/ }, function(errcontainer) {
 
  /* ... */
 
  container.attach({stream: true, stdout: true, stderr: true}, function (errstream) {
    stream.pipe(process.stdout);
  });
 
  /* ... */
}
 
//tty:false 
docker.createContainer({ /*...*/ Tty: false /*...*/ }, function(errcontainer) {
 
  /* ... */
 
  container.attach({stream: true, stdout: true, stderr: true}, function (errstream) {
    //dockerode may demultiplex attach streams for you :) 
    container.modem.demuxStream(stream, process.stdout, process.stderr);
  });
 
  /* ... */
}
 
docker.createImage({fromImage: 'ubuntu'}, function (errstream) {
  stream.pipe(process.stdout);
});
 
//... 
  • image - container image
  • cmd - command to be executed
  • stream - stream(s) which will be used for execution output.
  • create_options - options used for container creation. (optional)
  • start_options - options used for container start. (optional)
  • callback - callback called when execution ends.
docker.run('ubuntu', ['bash', '-c', 'uname -a'], process.stdout, function (errdatacontainer) {
  console.log(data.StatusCode);
});

or, if you want to split stdout and stderr (you must to pass Tty:false as an option for this to work)

docker.run('ubuntu', ['bash', '-c', 'uname -a'], [process.stdout, process.stderr], {Tty:false}, function (errdatacontainer) {
  console.log(data.StatusCode);
});

Run also returns an EventEmitter supporting the following events: container, stream, data. Allowing stuff like this:

docker.run('ubuntu', ['bash', '-c', 'uname -a'], [process.stdout, process.stderr], {Tty:false}, function (errdatacontainer) {
  //... 
}).on('container', function (container) {
  container.defaultOptions.start.Binds = ["/tmp:/tmp:rw"];
});
  • repoTag - container image name (optionally with tag) myrepo/myname:withtag
  • opts - extra options passed to create image.
  • callback - callback called when execution ends.
docker.pull('myrepo/myname:tag', function (errstream) {  
  // streaming output from pull... 
});

docker-modem already base64 encodes the necessary auth object for you.

var auth = {
  username: 'username',
  password: 'password',
  auth: '',
  email: 'your@email.email',
  serveraddress: 'https://index.docker.io/v1'
};
 
docker.pull('tag', {'authconfig': auth}, function (errstream) {
  //... 
});
  • followProgress - allows to fire a callback only in the end of a stream based process. (build, pull, ...)
//followProgress(stream, onFinished, [onProgress]) 
docker.pull(repoTag, function(errstream) {
  //... 
  docker.modem.followProgress(stream, onFinished, onProgress);
 
  function onFinished(erroutput) {
    //output is an array with output json parsed objects 
    //... 
  }
  function onProgress(event) {
    //... 
  }
});
  • demuxStream - demux stdout and stderr
//demuxStream(stream, stdout, stderr) 
container.attach({
  stream: true,
  stdout: true,
  stderr: true
}, function handler(errstream) {
  //... 
  container.modem.demuxStream(stream, process.stdout, process.stderr);
  //... 
});

docker pull ubuntu:latest to prepare your system for the tests.

Tests are implemented using mocha and chai. Run them with npm test.

Check the examples folder for more specific use cases examples.

Pedro Dias - @pedromdias

Licensed under the Apache license, version 2.0 (the "license"); You may not use this file except in compliance with the license. You may obtain a copy of the license at:

http://www.apache.org/licenses/LICENSE-2.0.html

Unless required by applicable law or agreed to in writing, software distributed under the license is distributed on an "as is" basis, without warranties or conditions of any kind, either express or implied. See the license for the specific language governing permissions and limitations under the license.