HMR not working with Laravel Mix in Docker

Question

I am having some problems setting up Hot Module Reloading in Laravel Mix inside a Docker container.

I have the following Dockerfile:

FROM php:7.4.0-fpm

RUN curl -sL https://deb.nodesource.com/setup_13.x | bash

RUN apt-get update && \
    apt-get install -y -q --no-install-recommends \
    nano apt-utils curl unzip default-mysql-client nodejs build-essential git \
    libcurl4-gnutls-dev libmcrypt-dev libmagickwand-dev \
    libwebp-dev libjpeg-dev libpng-dev libxpm-dev \
    libfreetype6-dev libaio-dev zlib1g-dev libzip-dev && \
    echo 'umask 002' >> /root/.bashrc  && \
    apt-get clean

# Docker PHP Extensions
RUN docker-php-ext-install -j$(nproc) iconv gettext gd mysqli curl pdo pdo_mysql zip && \
    docker-php-ext-configure gd --with-freetype=/usr/include/ --with-jpeg=/usr/include/ && \
    docker-php-ext-configure curl --with-curl

WORKDIR /var/www/html

COPY . /var/www/html

EXPOSE 80

Which I am building using the below docker-compose.yml file.

  # The Application
  app:
    build:
      context: ./
      dockerfile: app.dockerfile
    working_dir: /var/www/html
    volumes:
      - ./webroot:/var/www/html
    environment:
      - "DB_PORT=3306"
      - "DB_HOST=database"
      - CHOKIDAR_USEPOLLING=true

  # The Web Server
  web:
    build:
      context: ./
      dockerfile: web.dockerfile
    working_dir: /var/www/html
    volumes_from:
      - app
    ports:
      - 80:80

In previous Node.js apps, I have copied over the data inside the dockerfile, and mounted the volume in the compose file, however this doesn't seem to be having the same effect with Laravel.

I am seeing the below output in Git Bash, however the web pages are not reloading with changes at all after I run npm run hot inside the container, not even with a manual refresh:

Despite this, npm run watch-poll, which I have used previously, still works as expected.

Typically I see logs in the console from HMR and WDS inside the browser when viewing the application. However in this situation I am not seeing any outputs.

Below I have also included my webpack.mix.js file. I have been messing around with some of the options, such as the port and host, as I know they need to be configured a certain way when running inside a container. Any help would be appreciated as I am struggling to work out where I am going wrong.

mix.options({
    hmrOptions: {
        host: 'localhost',
        port: '80'
    },
});

mix.webpackConfig({
    mode: "development",
    devtool: "inline-source-map",
    devServer: {
        disableHostCheck: true,
        headers: {
            'Access-Control-Allow-Origin': '*'
        },
        host: "0.0.0.0",
        port: 80
    },
});

Edit:

Error output when running npm run hot after setting both host values to web:

> @ hot /var/www/html
> cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js

events.js:298
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRNOTAVAIL: address not available 172.25.0.4:80
    at Server.setupListenHandle [as _listen2] (net.js:1292:21)
    at listenInCluster (net.js:1357:12)
    at GetAddrInfoReqWrap.doListen [as callback] (net.js:1496:7)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:69:10)
Emitted 'error' event on Server instance at:
    at emitErrorNT (net.js:1336:8)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  code: 'EADDRNOTAVAIL',
  errno: -99,
  syscall: 'listen',
  address: '172.25.0.4',
  port: 80
}

Answer 1

I had the same issue, and used following command to fix that:

Laravel Mix version 6:

npx mix watch --hot -- --host 0.0.0.0 --port 8080 --watch-options-poll=1000

The only issue is that change host and port by mix.options API, did not works for me.