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"
  }
}

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

Is that! Thanks

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

The comment that im looking for, Thank you!

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

Work 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

Thx a lot.
For those who are interested, in the documentation -L option means --legacy-watch which enables Chokidar's polling.

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

It's work for me. Thank you!

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

This worked for me !!!

For those who're wondering where the -L flag comes from https://github.com/remy/nodemon/blob/main/lib/cli/parse.js#L132

Starting docker with docker-compose start, it's doens't starts nodemon.
My package.json:
"start.dev": "nodemon -L"
I've tried in that way too:
"start": "nodemon -L ts-node-dev -r tsconfig-paths/register src/infra/api.ts",
Then I've got:
Error: Cannot find module '/usr/app/ts-node-dev' at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15) at Function.Module._load (node:internal/modules/cjs/loader:778:27) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) at main (/usr/app/node_modules/ts-node/src/bin.ts:198:14) at Object.<anonymous> (/usr/app/node_modules/ts-node/src/bin.ts:288:3) at Module._compile (node:internal/modules/cjs/loader:1097:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1149:10) at Module.load (node:internal/modules/cjs/loader:975:32) at Function.Module._load (node:internal/modules/cjs/loader:822:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)

What am I doing wrong?

@guilhermealbino33 If you're using ts-node-dev you don't need nodemon. So your script might look something like this:

"start.dev": "ts-node-dev -r tsconfig-paths/register src/infra/api.ts"

If that doesn't auto restart on file changes, it looks like it takes a --poll flag:

"start.dev": "ts-node-dev --poll -r tsconfig-paths/register src/infra/api.ts"

But that does make it much more CPU heavy since it's reading the container file system every so often to detect changes.

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"
    }
}