Question 81409 in Docker Question posted in
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Dockerized project doesn't show changes in browser

I dockerized my react app using these commands:

docker build -t image-name .

docker run -e CHOKIDAR_USEPOLLING=true -v %cd%src:/app/src -p 3000:3000 --name container-name image-name

The problem is that when I save any updates in my components, they do not show up in the browser, although they have been updated in /app/src.

I thought that -e CHOKIDAR_USEPOLLING=true would fix it, but it didn’t.

When I go to: docker exec -it container-name bash. I can see that everything saves correctly, but the changes don’t show up in the browser after ctrl + s.

When I open localhost:3000, there is a popup Compiled with problems beacause I have some typescript warnings, but when I close it the website works great, but without updates.

My Dockerfile:

FROM node
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
EXPOSE 3000
CMD ["npm", "start"]

.dockerignore:

node_modules
Dockerfile
.git
.gitignore
.dockerignore
.env

Docker logs:

(node:26) [DEP_WEBPACK_DEV_SERVER_ON_AFTER_SETUP_MIDDLEWARE] DeprecationWarning: 'onAfterSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.
(Use `node --trace-deprecation ...` to show where the warning was created)
(node:26) [DEP_WEBPACK_DEV_SERVER_ON_BEFORE_SETUP_MIDDLEWARE] DeprecationWarning: 'onBeforeSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.

NODE_VERSION
19.0.1

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I fixed it. You need to update this line in package.json in scripts/start:

    "scripts": {
    "start": "WATCHPACK_POLLING=true react-scripts start",
  },

    but if You have a big frontend the updating delay will be terrible (like few seconds for every save and update)


  2. 0

    I think your build is still old one.
    You need to maybe delete in Docker UI old build and run new build and then run that docker image.

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