FROM ubuntu:20.04 RUN apt update # We directly answer the questions asked using the printf statement RUN printf 'y 1 1n' apt install nodejs RUN apt install -y npm Here we do our docker build: docker build -t mynpm. Here is the version check to verify its success: docker run -it mynpm npm -v The output I get as a result is: 6.14.4. If you have docker volumes attached to a container we can just use cp command to copy files from docker containers. See if your container have volumes attached, we can use below. Step1: Get container ID from ps from where you want to get file. This id is useful for inspecting the docker container properties.


Raspberry Pi Setup Guide

We have a dedicated setup guide for setting up Node.js, NVM, CNC.js, Autostart with pm2, all tested on the Raspberry Pi. Go to for more details.

Getting Started

Node.js Installation

Node.js 4 or higher is recommended. You can install Node Version Manager to manage multiple Node.js versions. If you have git installed, just clone the nvm repo, and check out the latest version:

Add these lines to your ~/.bash_profile, ~/.bashrc, or ~/.profile file to have it automatically sourced upon login:

Once installed, you can select Node.js versions with:

If you’re using Node.js 4 or earlier versions, it’s recommended that you upgrade npm to the latest version. To upgrade, run:


Install cncjs as a non-root user, or the serialport module may not install correctly on some platforms like Raspberry Pi.

If you’re going to use sudo or root to install cncjs, you need to specify the --unsafe-perm option to run npm as the root account.

It’s recommended that you run Raspbian Jessie on the RPi2 or RPi3. For Raspbian Wheezy, be sure to install gcc/g++ 4.8 before npm install.

Check out for other installation methods.


Run npm install -g [email protected] to install the latest version. To determine the version, use cnc -V.


Run cnc to start the server, and visit http://yourhostname:8000/ to view the web interface. Pass --help to cnc for more options.

Npm install not working in docker container

Instead of passing command line options for --watch-directory, --access-token-lifetime, and --allow-remote-access, you can create a ~/.cncrc file that contains the following configuration in JSON format:

To troubleshoot issues, run:

Configuration File

The configuration file .cncrc contains settings that are equivalent to the cnc command-line options. The configuration file is stored in user’s home directory. To find out the actual location of the home directory, do the following:

  • Linux/Mac

  • Windows

Check out an example configuration file here.

Npm Install In Docker Container Fails

File Format

Git Installation

If you prefer to use Git instead of npm install, You can create a local clone of the repository on your computer and sync from GitHub. Type the following commands to install and run cnc:

To update your local copy with latest changes, use:

This is the fastest method to bring your local copy up-to-date.

Docker Image Installation (x64 only)

Install Npm Package In Docker Container

Alternatively, you can install and run a Docker image within a Docker container. The first installation may take a long time to complete, but further updates will be much faster.

To install and set up cnc, take the following steps:

Step 1: Enter the following command to retrieve the latest version of the image:

Step 2: Use the docker run command to create the Docker container and run the server, like so:

By default a container is not allowed to access any devices, but a “privileged” container is given access to all devices on the host.


Step 3: If everything works fine, you should be able to view the web interface at http://yourhostname:8000/.

Docker Images


If you run into issues and need to restart the Docker container, use the following commands to first stop the Docker application, and then start it up again:

To view a list of all containers that are currently running in your Docker environment, use:

To view all the images you have pulled into your Docker environment, use:

To delete containers in your Docker environment, use:

Docker Install Npm In Container Model

To delete images in your Docker environment, use:

Npm Install Not Working In Docker Container

Docker desktop for mac el capitan. To view the container in your terminal, use:

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