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Docker + Node = Dockerode (Node.js module for Docker's Remote API)

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apocas/dockerode

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Not another Node.js Docker Remote API module.

dockerode objectives:

  • streams -dockerode does NOT break any stream, it passes them to you allowing for some stream voodoo.
  • stream demux - Supports optionalstream 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 akadocker run.
  • tests -dockerode really aims to have a good test set, allowing to followDocker changes easily, quickly and painlessly.
  • feature-rich - There's a real effort in keepingAllDocker Remote API features implemented and tested.
  • interfaces - Featurescallback andpromise based interfaces, making everyone happy :)

Ecosystem

Installation

npm install dockerode

Usage

  • Input options are directly passed to Docker. CheckDocker 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.

Getting started

To usedockerode first you need to instantiate it:

varDocker=require('dockerode');vardocker=newDocker({socketPath:'/var/run/docker.sock'});vardocker1=newDocker();//defaults to above if env variables are not usedvardocker2=newDocker({host:'http://192.168.1.10',port:3000});vardocker3=newDocker({protocol:'http',host:'127.0.0.1',port:3000});vardocker4=newDocker({host:'127.0.0.1',port:3000});//defaults to http//protocol http vs https is automatically detectedvardocker5=newDocker({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'),version:'v1.25'// required when Docker >= v1.13, https://docs.docker.com/engine/api/version-history/});vardocker6=newDocker({protocol:'https',//you can enforce a protocolhost:'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')});//using a different promise library (default is the native one)vardocker7=newDocker({Promise:require('bluebird')//...});//...

Manipulating a container:

// create a container entity. does not query APIvarcontainer=docker.getContainer('71501a8ab0f8');// query API for container infocontainer.inspect(function(err,data){console.log(data);});container.start(function(err,data){console.log(data);});container.remove(function(err,data){console.log(data);});// promises are supportedvarauxContainer;docker.createContainer({Image:'ubuntu',AttachStdin:false,AttachStdout:true,AttachStderr:true,Tty:true,Cmd:['/bin/bash','-c','tail -f /var/log/dmesg'],OpenStdin:false,StdinOnce:false}).then(function(container){auxContainer=container;returnauxContainer.start();}).then(function(data){returnauxContainer.resize({h:process.stdout.rows,w:process.stdout.columns});}).then(function(data){returnauxContainer.stop();}).then(function(data){returnauxContainer.remove();}).then(function(data){console.log('container removed');}).catch(function(err){console.log(err);});

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"];

Stopping all containers on a host

docker.listContainers(function(err,containers){containers.forEach(function(containerInfo){docker.getContainer(containerInfo.Id).stop(cb);});});

Building an Image

Context: provides the path to the Dockerfile. Additionaly files that are involved in the buildmust be explicitly mentioned in src array, since they are sent to a temp env to build. Example: file for COPY command are extracted from that temporary environment.

docker.buildImage('archive.tar',{t:imageName},function(err,response){//...});docker.buildImage({context:__dirname,src:['Dockerfile','file1','file2']},{t:imageName},function(err,response){//...});

buildImage returns a Promise of NodeJS stream. In case you want to find out when the build has finished, you must follow the progress of the build with themodem instance in dockerode:

letdockerode=newDockerode();letstream=awaitdockerode.buildImage(...);awaitnewPromise((resolve,reject)=>{dockerode.modem.followProgress(stream,(err,res)=>err ?reject(err) :resolve(res));});// Build has finished

Creating a container:

docker.createContainer({Image:'ubuntu',Cmd:['/bin/bash'],name:'ubuntu-test'},function(err,container){container.start(function(err,data){//...});});//...

Streams goodness:

//tty:truedocker.createContainer({/*...*/Tty:true/*...*/},function(err,container){/* ... */container.attach({stream:true,stdout:true,stderr:true},function(err,stream){stream.pipe(process.stdout);});/* ... */});//tty:falsedocker.createContainer({/*...*/Tty:false/*...*/},function(err,container){/* ... */container.attach({stream:true,stdout:true,stderr:true},function(err,stream){//dockerode may demultiplex attach streams for you :)container.modem.demuxStream(stream,process.stdout,process.stderr);});/* ... */});docker.createImage({fromImage:'ubuntu'},function(err,stream){stream.pipe(process.stdout);});//...

There is also support forHTTP connection hijacking,which allows for cleaner interactions with commands that work with stdin and stdout separately.

docker.createContainer({Tty:false,/*... other options */},function(err,container){container.start(function(err){container.exec({Cmd:['shasum','-'],AttachStdin:true,AttachStdout:true},function(err,exec){exec.start({hijack:true,stdin:true},function(err,stream){// shasum can't finish until after its stdin has been closed, telling it that it has// read all the bytes it needs to sum. Without a socket upgrade, there is no way to// close the write-side of the stream without also closing the read-side!fs.createReadStream('node-v5.1.0.tgz','binary').pipe(stream);// Fortunately, we have a regular TCP socket now, so when the readstream finishes and closes our// stream, it is still open for reading and we will still get our results :-)docker.modem.demuxStream(stream,process.stdout,process.stderr);});});});});

Equivalent ofdocker run indockerode:

  • image - container image
  • cmd - command to be executed
  • stream - stream(s) which will be used for execution output.
  • create_options - (optional) Options used for container creation. Refer to theDockerEngine ContainerCreate documentation for the possible values
  • start_options - (optional) Options used for container start. Refer to theDockerEngine ContainerStart documentation for the possible values
  • callback - callback called when execution ends (optional, promise will be returned if not used).
//callbackdocker.run('ubuntu',['bash','-c','uname -a'],process.stdout,function(err,data,container){console.log(data.StatusCode);});//promisedocker.run(testImage,['bash','-c','uname -a'],process.stdout).then(function(data){varoutput=data[0];varcontainer=data[1];console.log(output.StatusCode);returncontainer.remove();}).then(function(data){console.log('container removed');}).catch(function(err){console.log(err);});

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

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

If you provide a callback,run will return an EventEmitter supporting the following events: container, stream, data.If a callback isn't provided a promise will be returned.

docker.run('ubuntu',['bash','-c','uname -a'],[process.stdout,process.stderr],{Tty:false},function(err,data,container){//...}).on('container',function(container){//...});

And here is one more complex example using auto-remove and Docker network.

docker.run('some-python-image',['python','main.py',arg],process.stdout,{name:'my-python-container',HostConfig:{AutoRemove:true,NetworkMode:'my_network'}},function(err,data,container){// Do stuff});

Equivalent ofdocker pull indockerode:

  • repoTag - container image name (optionally with tag)myrepo/myname:withtag
  • options - extra options passed to create image.
  • callback - callback called when execution ends.
docker.pull('myrepo/myname:tag',function(err,stream){// streaming output from pull...});

Pull from private repos

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

varauth={username:'username',password:'password',auth:'',email:'your@email.email',serveraddress:'https://index.docker.io/v1'};docker.pull('tag',{'authconfig':auth},function(err,stream){//...});

If you already have a base64 encoded auth object, you can use it directly:

varauth={key:'yJ1J2ZXJhZGRyZXNzIjoitZSI6Im4OCIsImF1dGgiOiIiLCJlbWFpbCI6ImZvbGllLmFkcmc2VybmF0iLCJzZX5jb2aHR0cHM6Ly9pbmRleC5kb2NrZXIuaW8vdZvbGllYSIsInBhc3N3b3JkIjoiRGVjZW1icmUjEvIn0='}

Helper functions

  • 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(err,stream){//...docker.modem.followProgress(stream,onFinished,onProgress);functiononFinished(err,output){//output is an array with output json parsed objects//...}functiononProgress(event){//...}});
  • demuxStream - demux stdout and stderr
//demuxStream(stream, stdout, stderr)container.attach({stream:true,stdout:true,stderr:true},functionhandler(err,stream){//...container.modem.demuxStream(stream,process.stdout,process.stderr);//...});

Sponsors

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HTTP Toolkit

Documentation

Docker

Container

Exec

Image

Network

Node

Plugin

Secret

Service

Task

Volume

Tests

  • docker pull ubuntu:latest to prepare your system for the tests.
  • Tests are implemented usingmocha andchai. Run them withnpm test.

Examples

Check the examples folder for more specific use cases examples.

License

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.

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