How to change permission of a folder to 777 in Dockerfile? - docker

Question

I have a project directory like this:
|-var/www
|-docker-compose.yml
|-app
|--uploads
|---photos
|-Dockerfile
This is my docker-compose.yml file:
myapp:
build:
context: myfolder
dockerfile: Dockerfile
container_name: flask
image: api/v1:01
restart: unless-stopped
environment:
APP_ENV: "prod"
APP_DEBUG: "False"
APP_PORT: 5000
volumes:
- appdata:/var/www
What I want:
I want to change app/uploads/photos this folder's permission to 777.This is an upload folder,so user can upload to this folder.
My Dockerfile now is look like this:
FROM python:3.6.8-alpine3.9
ENV GROUP_ID=1000 \
USER_ID=1000
WORKDIR /var/www/
ADD . /var/www/
RUN apk add --no-cache build-base libffi-dev openssl-dev ncurses-dev
RUN pip install --upgrade pip
RUN pip install -r requirements.txt
RUN addgroup -g $GROUP_ID www
RUN adduser -D -u $USER_ID -G www www -s /bin/sh
USER www
EXPOSE 5000
After looking in this question,In order to achieve what I want,I tried below:
FROM python:3.6.8-alpine3.9
ENV GROUP_ID=1000 \
USER_ID=1000
WORKDIR /var/www/
ADD . /var/www/
RUN apk add --no-cache build-base libffi-dev openssl-dev ncurses-dev
RUN pip install --upgrade pip
RUN pip install -r requirements.txt
RUN addgroup -g $GROUP_ID www
RUN adduser -D -u $USER_ID -G www www -s /bin/sh
RUN chown -R www:www /var/www
RUN chmod -R 777 /var/www/uploads
RUN chmod -R 777 /var/www/uploads/photos
USER www
EXPOSE 5000
But seems like the chmod command in my dockerfile is not taking effect.Cause whenever I upload some files to app/uploads/photos in my code,my nginx server keep getting this error:
PermissionError: [Errno 13] Permission denied: '/var/www/uploads/photos/myfilename.png'
Somebody please help.Please provide a solution for how to change the permission of a folder in Dockerfile.
UPDATE:
I tried to change the permission of /var/www/uploads after build the container and the container is running by doing below:
docker exec -it myapp /bin/sh
then run
chmod -R 777 /var/www/uploads
What I get is chmod: /var/www/uploads: Operation not permitted
Therefore I suspect the this error will also happened when the docker is building,then according to this answer from serverfault, I tried to modify the dockerfile to this:
FROM python:3.6.8-alpine3.9
ENV GROUP_ID=1000 \
USER_ID=1000
WORKDIR /var/www/
ADD . /var/www/
USER root
RUN chmod -R 777 /var/www/uploads
RUN addgroup -g $GROUP_ID www
RUN adduser -D -u $USER_ID -G www www -s /bin/sh
USER www
RUN apk add --no-cache build-base libffi-dev openssl-dev ncurses-dev
RUN pip install --upgrade pip
RUN pip install -r requirements.txt
EXPOSE 5000
But it still doesnt work.Look like my above approach is also wrong.Cause I already run in root in the dockerfile.But at the same time,when I access the container in host using docker exec,also getting Operation not permitted.
I am very new in Docker.Just cant figure it out how to get this done.
What I hope to know:
1) How to change the folder var/www/uploads to permission 777?
2) What is the problem causing I cant change the permission from my approach?
3) What is the better way to achieve this? (If any)