Why is there no access to a file inside a Docker container?

Question

Docker

All good. I'm trying to package in a Django container.

Dockerfile

FROM python:3.9
ENV PYTHONUNBUFFERED 1
WORKDIR /backend
ADD . /backend
COPY start.sh /backend/start.sh
RUN chmod +x ./start.sh
RUN pip install -r /backend/requirements.txt
# RUN ls -a
CMD  ["/backend/start.sh"]

docker-compose.yml

version: "3.9"

volumes:
  db-data:
   
services:
  db:
    image: postgres
    volumes:
      - ./data/db:/var/lib/postgresql/data
    ports:
      - 5432:5432  
    environment:
      - POSTGRES_DB=visionmark
      - POSTGRES_USER=nariman
      - [email protected]
    volumes:
      - db-data:/var/lib/postgresql/data  

  backend:
    build: ./backend
    volumes:
      - .:/backend
    expose:
      - "8000"
    depends_on:
      - db

Project structure


when running docker-compose I get an error


ERROR: for backend Cannot start service backend: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "/backend/start.sh": stat /backend/start .sh: no such file or directory: unknown
ERROR: Encountered errors while bringing up the project.

Answer 1

I have a question too. you copy the project to /backend in the Dockerfile, ok, I see.
why are you doing this in docker-compise -
volumes:
- .:/backend
i.e. you mount the contents of the working directory in /backend again

Answer 2

RUN chmod +x /backend/start.sh