Cannot use hot reloading in Docker

[cod3rshotout]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

I'm trying to run docusaurus over docker and use the hot reload feature so I don't need to recompile each time the project, but for some reason when I do a change the project doesn't recompile

Steps to reproduce

1. Create a new project and install docusaurus, I have the version 2.0.0-beta.15
2. Create this docker-compose:

  version: "3"

  services:
    docusaurus:
      build: .
      expose:
        - 3000
        - 35729
      ports:
        - 3000:3000
        - 35729:35729
      volumes:
        - ./docs:/app/docs
        - ./website/blog:/app/website/blog
        - ./website/core:/app/website/core
        - ./website/i18n:/app/website/i18n
        - ./website/pages:/app/website/pages
        - ./website/static:/app/website/static
        - ./website/sidebars.json:/app/website/sidebars.json
        - ./website/siteConfig.js:/app/website/siteConfig.js
      working_dir: /app/website

3. Create this Dockerfile:

FROM node:lts

WORKDIR /app/website

EXPOSE 3000 35729
COPY ./docs /app/docs
COPY ./website /app/website
RUN yarn install

CMD ["yarn", "start", "--host", "0.0.0.0", "--port", "35729"]

4. Now run docker-compose up --build -d
5. Try to change a file within docs, nothing happen

Expected behavior

When an update is made, the code should reload automatically

Actual behavior

When an update is made no changes are reflected on the live site

Your environment

• Public source code:
• Public site URL:
• Docusaurus version used:
• Environment name and version (e.g. Chrome 89, Node.js 16.4):
• Operating system and version (e.g. Ubuntu 20.04.2 LTS):

Reproducible demo

No response

Self-service

• I'd be willing to fix this bug myself.

[Josh-Cena]

Not using Docker-compose, but someone else asked the same thing on Discord. Could you research if:

• Docker exposes FS events like add or change, which docusaurus start listens to?
• Chokidar works in Docker?

From my research, seems Docker doesn't support file watchers, and you have to use the --poll CLI option. Could you try setting that to something like --poll 1000?

[Josh-Cena]

Closing. If there's anything that Docusaurus could clearly improve, please follow-up. Otherwise I'd be considering this as a question.

[turbotimon]

Using windows 10 together with a vscode devcontainer (javascript-node:0-18) i faced the same problem (no hot reload with yarn start). However, it worked with the poll option yarn start --poll.

[slorber]

This is normally fixed in #7951 but will only appear in Docusaurus v3.
Try a canary release and please report if it works better

[turbotimon]

@slorber Thanks, I'm on 2.3.1. The workaround is enough for the moment. Just wanted to give a solution to other people that might search for "devcontainer" in the issues (as i was before finding this)