docker-node

by nodejs

nodejs / docker-node

Official Docker Image for Node.js :whale: :turtle: :rocket:

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Node.js

dockeri.co

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The official Node.js docker image, made with love by the node community.

Table of Contents

What is Node.js?

Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

See: http://nodejs.org

How to use this image

Create a
Dockerfile
in your Node.js app project

# specify the node base image with your desired version node:
FROM node:10
# replace this with your application's default port
EXPOSE 8888

You can then build and run the Docker image:

$ docker build -t my-nodejs-app .
$ docker run -it --rm --name my-running-app my-nodejs-app

If you prefer Docker Compose:

version: "2"
services:
  node:
    image: "node:8"
    user: "node"
    working_dir: /home/node/app
    environment:
      - NODE_ENV=production
    volumes:
      - ./:/home/node/app
    expose:
      - "8081"
    command: "npm start"

You can then run using Docker Compose:

$ docker-compose up -d

Docker Compose example copies your current directory (including node_modules) to the container. It assumes that your application has a file named

package.json
defining start script.

Best Practices

We have assembled a Best Practices Guide for those using these images on a daily basis.

Run a single Node.js script

For many simple, single file projects, you may find it inconvenient to write a complete

Dockerfile
. In such cases, you can run a Node.js script by using the Node.js Docker image directly:
$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/app -w /usr/src/app node:8 node your-daemon-or-script.js

Verbosity

Prior to 8.7.0 and 6.11.4 the docker images overrode the default npm log level from

warn
to
info
. However due to improvements to npm and new Docker patterns (e.g. multi-stage builds) the working group reached a consensus to revert the log level to npm defaults. If you need more verbose output, please use one of the following methods to change the verbosity level.

Dockerfile

If you create your own

Dockerfile
which inherits from the
node
image you can simply use
ENV
to override
NPM_CONFIG_LOGLEVEL
.
FROM node
ENV NPM_CONFIG_LOGLEVEL info
...

Docker Run

If you run the node image using

docker run
you can use the
-e
flag to override
NPM_CONFIG_LOGLEVEL
.
$ docker run -e NPM_CONFIG_LOGLEVEL=info node ...

NPM run

If you are running npm commands you can use

--loglevel
to control the verbosity of the output.
$ docker run node npm --loglevel=warn ...

Image Variants

The

node
images come in many flavors, each designed for a specific use case. All of the images contain pre-installed versions of
node
,
npm
, and
yarn
. For each supported architecture, the supported variants are different. In the file: architectures, it lists all supported variants for all of the architectures that we support now.

node:

This is the defacto image. If you are unsure about what your needs are, you probably want to use this one. It is designed to be used both as a throw away container (mount your source code and start the container to start your app), as well as the base to build other images off of. This tag is based off of

buildpack-deps
.

buildpack-deps
is designed for the average user of docker who has many images on their system. It, by design, has a large number of extremely common Debian packages. This reduces the number of packages that images that derive from it need to install, thus reducing the overall size of all images on your system.

node:alpine

This image is based on the popular Alpine Linux project, available in the

alpine
official image. Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.

This variant is highly recommended when final image size being as small as possible is desired. The main caveat to note is that it does use musl libc instead of glibc and friends, so certain software might run into issues depending on the depth of their libc requirements. However, most software doesn't have an issue with this, so this variant is usually a very safe choice. See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images. One common issue that may arise is a missing shared library required for use of

process.dlopen
. To add the missing shared libraries to your image, adding the
libc6-compat
package in your Dockerfile is recommended:
apk add --no-cache libc6-compat

To minimize image size, it's uncommon for additional related tools (such as

git
or
bash
) to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile (see the
alpine
image description
for examples of how to install packages if you are unfamiliar).

node:slim

This image does not contain the common packages contained in the default tag and only contains the minimal packages needed to run

node
. Unless you are working in an environment where only the Node.js image will be deployed and you have space constraints, we highly recommend using the default image of this repository.

License

License information for the software contained in this image. License information for the Node.js Docker project.

Supported Docker versions

This image is officially supported on Docker version 1.9.1.

Support for older versions (down to 1.6) is provided on a best-effort basis.

Please see the Docker installation documentation for details on how to upgrade your Docker daemon.

Supported Node.js versions

This project will support Node.js versions as still under active support as per the Node.js release schedule.

Governance and Current Members

The Node.js Docker Image is governed by the Docker Working Group. See GOVERNANCE.md to learn more about the group's structure and CONTRIBUTING.md for guidance about the expectations for all contributors to this project.

Docker Working Group Members

Docker Working Group Collaborators

Emeritus

Docker Working Group Members

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