Node Docker Compose nodemon

.dockerignore

node_modules

.gitignore

node_modules

README.md

Reload node processes on file save in Docker

Run docker-compose up --build.

Make changes to index.js and see the server restart.

docker-compose.yaml

version: '3'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile.dev
    volumes:
      - ./:/usr/src/app
      - /usr/src/app/node_modules # Remove this if you have pure JS dependencies
    ports:
      - "3000:3000"

Dockerfile.dev

FROM node:16-alpine

# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

# Install dependencies
COPY package.json .
RUN npm install

# Bundle app source
COPY index.js ./

# Exports
EXPOSE 3000
CMD [ "npm", "run", "start.dev" ]

index.js

'use strict'

const express = require('express')

const { PORT = '3000' } = process.env
const app = express()

app.use((req, res, next) => {
  res.send('Hello Jack')
})

app.listen(PORT)

package.json

{
  "main": "index.js",
  "scripts": {
    "start": "node index",
    "start.dev": "nodemon"
  },
  "dependencies": {
    "express": "^4.17.2"
  },
  "devDependencies": {
    "nodemon": "^2.0.15"
  }
}

Even using --poll it doesn't auto restart.
Using ts-node with docker it have never auto restarted in my api.

I was able to make this gist work on my machine with the following changes:

package.json

{
  "main": "index.js",
  "scripts": {
    "start": "node index",
    "start.dev": "ts-node-dev index"
  },
  "dependencies": {
    "express": "^4.17.2"
  },
  "devDependencies": {
    "nodemon": "^2.0.15",
    "ts-node-dev": "^1.1.8"
  }
}

More complex environments may require more tweaking. It may also matter what version of docker you're using and your operating system. I'm currently using:

macOS 12.1 21C52 arm64
Docker version 20.10.11, build dea9396

The -L worked for me thanks!

For those who are having the issue of it not updating you must start nodemon with the -L flag to catch file changes

That worked for thank you ❤️

-L alone didn't help me. adding specific config file nodemon.json or config within package.json can help

{
    "ext": "js,json,ts",
    "watch": ["src"],
    "ignore": ["node_modules/**/node_modules"],
    "exec": "ts-node ./src/index.ts",
    "verbose": true,
    "legacyWatch": true,
    "env": {
        "NODE_ENV": "development"
    }
}