Create Node.js app usin Docker without installing node on host machine-CodePudding

New to docker. I wanted to create a simple Node.js app using docker on my Ubuntu OS. But all the tutorials/YouTube Videos are first installing Node on host machine, then run and test the app, and then dockerizing the app. Means all the tutorials are simply teaching "How to dockerize an existing app".

If anyone can provide a little guidance on this then it would be really helpful.

CodePudding user response：

First create a directory for your source code and create something like the starter app from here in app.js. You have to make one change though: hostname has to be 0.0.0.0 rather than 127.0.0.1.

Then run an interactive node container using this command

docker run -it --rm -v $(pwd):/app -p 3000:3000 node /bin/bash

This container has your host directory mapped to /app, so if you do

cd /app
ls -al

you should see your app.js file.

Now you can run it using

node app.js

If you then switch back to the host, open a browser and go to http://localhost:3000/ you should get a 'Hello world' response.

CodePudding user response：

Follow this


# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5 )
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]

docker build . -t <your username>/node-web-app
docker run -p 49160:8080 -d <your username>/node-web-app

You can create package*.json ./ files manually, if you don't want to install node/npm on your local machine.