exec ./start.sh: no such file or directory

Question

I have a Django project that runs in a Docker container within docker-compose.yml with postgresql, pgadmin4 and redis. I have start.sh script that make and run migrations:

start.sh:

#!/bin/bash
# Creating migrations if they are
python manage.py makemigrations
# Apply migrations
python manage.py migrate

After building the image and runing docker-compose up command django project give me an error: exec ./start.sh: no such file or directory but my start.sh file is in the same directory where Dockerfile and docker-compose.yml are. PostgreSQL, pgadmin4 and Redis runs successfully. How to solve this problem? My system is Windows 10.

Dockerfile:

FROM python:3.11.3-alpine

ENV PYTHONBUFFERED=1

WORKDIR /code

COPY requirements.txt .

RUN pip install -r requirements.txt --upgrade

COPY . .

COPY start.sh .

RUN chmod +x start.sh

ENTRYPOINT [ "./start.sh" ]

EXPOSE 8000

CMD ["python3", "manage.py", "runserver", "0.0.0.0:8000"]

docker-compose.yml:

services:
  api:
    image: meduzzen-backend-api
    container_name: django
    tty: true
    stdin_open: true
    volumes:
      - .:/code
      - ./code:/apps
    ports:
      - "8000:8000"
    depends_on:
      - postgres-db
      - redis
    env_file:
      - .env
    networks:
      - api-db-redis

  postgres-db:
    image: postgres:latest
    container_name: postgres_db
    ports:
      - "5432:5432"
    volumes:
      - data:/var/lib/postgresql/data
    env_file:
      - .env
    networks:
      api-db-redis:
        # Have access the database using pgadmin4
        ipv4_address: 172.24.0.6

  pg-admin:
    image: dpage/pgadmin4:latest
    container_name: pg_admin
    env_file:
      - .env
    ports:
      - "5050:5050"
    networks:
      - api-db-redis

  redis:
    image: redis:latest
    container_name: redis_cache
    ports:
      - "6379:6379"
    networks:
      - api-db-redis

volumes:
  data:

networks:
  api-db-redis:
    ipam:
      driver: default
      config:
        - subnet: 172.24.0.0/24

I've tried to add \r in the end of start.sh instructions.Change file destination in Dockerfile.

Answer 1

Your issue is that you're using an Alpine image and they don't have bash installed by default.

In the first line of your script, you've indicated that the script should be run using bash and so it fails.

Change the first line in your script to

#!/bin/sh 

and it'll work.

One thing you should be aware of is that Docker only runs a single command when the container starts. When you have both an ENTRYPOINT and a CMD, those are concatenated into a single command. In your case, the command is

./start.sh python3 manage.py runserver 0.0.0.0:8000

I think that you think that they'll be run as two separate commands. They won't.