Docker Install Npm In Container

17-04-2021 admin

We had similar problem when doing npm install in docker build time. Inspired from solution from Daniel van Flymen and combining it with git url rewrite, we found a bit simpler method for authenticating npm install from private github repos - we used oauth2 tokens instead of the keys. Docker Image Installation (x64 only) 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. Normally, docker containers are run using the user root.I'd like to use a different user, which is no problem using docker's USER directive. But this user should be able to use sudo inside the container. A Little Bit of Container History. Docker is a container runtime. A lot of people think that Docker was the first of its kind, but this is not true – Linux containers have existed since the 1970s. Docker is important to both the development community and container community because it made using containers so easy that everyone started doing it.

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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 https://cnc.js.org/docs/rpi-setup-guide/ 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:

Installation

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 https://cnc.js.org/docs/installation/ for other installation methods.

Upgrade

Run npm install -g cncjs@latest to install the latest version. To determine the version, use cnc -V.

Usage

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

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.

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)

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

Tips

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:

To delete images in your Docker environment, use:

To view the container in your terminal, use:

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In the Dockerfile introduction post I introduced a simple Node.js Dockerfile example:

Install Npm In Docker Container

NOTE: use double quotes in the CMD line. Single quotes will result in an error.

Let’s use this Dockerfile to build an image, and then run the container.

I’m going to create this file in the dev/docker/examplenode folder. I create a simple Node.js app in the app.js file, using Express:

Super simple, but we have one dependency. I need to add it to the package.json file, so I run

Now you can run node app.js and make sure it works:

Stop this process and let’s create a Docker Image from this.

All you need are the app.js, package.json and package-lock.json files.

And the Dockerfile. Create a Dockerfile file in the same folder, with no extension (not Dockerfile.txt).

You can freely delete the node_modules folder that now contains the Express library and its dependencies, but you can also create a .dockerignore file and add node_modules inside it, to make Docker ignore this folder completely.

It works like .gitignore in Git.

Npm Install In Docker Container Fails

Run the command

It will take a while to download the Node image and run npm install, then you’ll get a successful message.

It’s important to note that after you first download a base image like the node one we use here, that will be cached locally, so you don’t need to download it again and the image building process will be much faster.

Now we can run a container from the image:

Now you can see the image running in Docker Desktop:

And you can click the “Open in browser” button to open the app running on port 3000:

Just like before! Except now the app is running in its own container, completely isolated, and we can run whatever version of Node we want in the container, with all the benefits Docker gives us.

Docker Install Nodejs In Container

For example you can remove the container and run it on port 80 instead of 3000, with:

Install Npm Package In Docker Container

The image does not need to change, all you change is the port mapping. Here’s the result:

Npm Install Not Working In Docker Container

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