I’m having some trouble with “Setting the User” in the “Building Images” section in the Docker course. My local machine is running Ubuntu and when I run this command: sudo docker build -t react-app . I get this error from npm: Sending build context to Docker daemon 2.248MB Step 1/9 : FROM node:14.16.0-alpine3.13 —> 50bfd284aa0d Step 2/9 : RUN addgroup app && adduser -S -G app app —> Using cache —> d6571e5eb8c6 Step 3/9 : USER app —> Using cache —> 21377574fca0 Step 4/9 : WORKDIR /ap…

However I can’t find the solution there, that’s why I am creating a new topic
When I follow the instructor still I get this permission error:

Dockerfile

FROM node:14.16.0-alpine3.13
RUN addgroup app && adduser -S -G app app
USER app
WORKDIR /app
COPY . .
RUN npm install
ENV API_URL=http://api.myapp.com/
EXPOSE 3000
CMD [“npm”, “start”]
Step 6/9 : RUN npm install
—> Running in 103nj60a010c2
npm WARN read-shrinkwrap This version of npm is compatible with lockfileVersion@1, but package-lock.json was generated for lockfileVersion@2. I’ll try to do my best with it!
npm WARN checkPermissions Missing write access to /app
npm ERR! code EACCES
npm ERR! syscall access
npm ERR! path /app
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, access ‘/app’
npm ERR! [Error: EACCES: permission denied, access ‘/app’] {
npm ERR! errno: -13,
npm ERR! code: ‘EACCES’,
npm ERR! syscall: ‘access’,
npm ERR! path: ‘/app’
npm ERR! }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/app/.npm/_logs/2021-04-02T22_17_49_152Z-debug.log
Then from the above this thread I updated my Docker file.
My new dockerfile contents:
FROM node:16.0.0-alpine3.13
RUN addgroup app && adduser -S -G app app
RUN mkdir /app && chown app:app /app
USER app
WORKDIR /app
COPY . .
RUN npm install
When I try to build the container I get this permission error:
npm ERR! code EACCES
npm ERR! syscall open
npm ERR! path /app/package-lock.json
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, open '/app/package-lock.json'
npm ERR!  [Error: EACCES: permission denied, open '/app/package-lock.json'] {
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'open',
npm ERR!   path: '/app/package-lock.json'
npm ERR! }
npm ERR! 
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR! 
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/app/.npm/_logs/2021-05-08T12_59_30_045Z-debug.log
I don’t understand, why I am getting this error as the parent directory is owned by the app user, and it also have permissions to read package.lock and package.json files.
If I remove the RUN npm install from Dockerfile and build the container, this is the output of ls -l
-rw-r--r--    1 root     root        660074 May  5 12:33 package-lock.json
-rw-r--r--    1 root     root           813 Mar  5 19:00 package.json
The other user have read permission. And that seems to be the permissions

npm install needs.

Why am I getting permission error here? Please help
              
I researched and tested for 6 Hours and found that the below SCRIPT 1 as shown in Mosh’s lecture video is working only if you use the same version of node in video.
SCRIPT 1 - From Video
FROM node:14.16.0-alpine3.13
RUN addgroup app && adduser -S -G app app

USER app
WORKDIR /app
RUN npm install

EXPOSE 3000
CMD [“npm”, “start”]
SCRIPT 2
Latest and other alpine versions have default use NODE which is overriding our app users so below is the solution to use both NODE user and our app users.
###Using custom user i.e. app###
FROM node:16.10.0-alpine3.14
RUN addgroup app && adduser -S -G app app
USER app
WORKDIR /app
COPY --chown=app:node package*.json ./
RUN npm install
COPY --chown=app:node . .
EXPOSE 3000
CMD [“npm”, “start”]
###Using default user i.e. node###
FROM node:16.10.0-alpine3.14
RUN addgroup app && adduser -S -G app app
USER app
WORKDIR /app
COPY --chown=node:node package*.json ./
RUN npm install
COPY --chown=node:node . .
EXPOSE 3000
CMD [“npm”, “start”]
I was going to create a post with my solution as I encountered the same problem. The specific error was with package-lock.json so forcing the user and group of package*.json files to be ‘app’ seems to also work.
FROM node:16.14.0-alpine3.15
RUN addgroup app && adduser -S -G app app
USER app
WORKDIR /app
COPY --chown=app:app package*.json .
RUN npm install
COPY . .
ENV API_URL=http://api.blah.com
EXPOSE 3000
CMD ["npm", "start"]
Thanks @Osama210690 and @shaunumb
I’ve tested and is working.
I checked Dockerfile command layer per layer and finally the “content of Dockerfile” is exactly the same with @shaunumb.
Here’s my Dockerfile:

Note: I’m using the latest node alpine version
FROM node:alpine 
RUN addgroup app && adduser -S -G app app
USER app
WORKDIR /app 
COPY --chown=app:app package*.json ./
RUN npm install 
COPY . .
EXPOSE 5173 
CMD ["npm", "run", "dev"]
              
Hi everybody,
I have the same issue with my Docker compose. I have a MERN Stack Application. When I Build my project with Docker compose on Windows it works fine but on Linux (Ubuntu) I got the following error in my React App container.

sh: react-scripts: permission denied
Here is my Project Structure

My Docker file in react-app
FROM node:16.14.0-alpine3.15
ENV NODE_ENV=production
WORKDIR /usr/src/react-app
COPY ["package.json", "package-lock.json*", "npm-shrinkwrap.json*", "./"]
RUN npm install
COPY . .
EXPOSE 3000
RUN chown -R node /usr/src/react-app
USER node
CMD ["npm", "start"]
Here is my script from package.json in react-app
"scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject",
    "lint": "eslint --fix"
I also tried the solution from @shaunumb but unfortunatily it does’nt work for me.

Any suggestions ?