Docker-Compose + Command

Question

It seems my docker-compose commands only execute the last command. In this case runserver.

command: python3 manage.py collectstatic --noinput
command: python3 manage.py migrate --noinput
command: python3 manage.py runserver 0.0.0.0:8000

I tried to move these commands into an entrypoint.sh file. However, I can't figure out how to implement this into my dockerfile & docker-compose.

The following is my dockerfile:

# Pull base image
FROM python:3

# Set environment varibles
ENV PYTHONUNBUFFERED 1

# Set work directory
RUN mkdir /code
WORKDIR /code

# Install dependencies
RUN pip install --upgrade pip
RUN pip install pipenv
COPY ./Pipfile /code/Pipfile
RUN pipenv install --deploy --system --skip-lock --dev

# Copy project
COPY . /code/

My docker-compose:

version: '3'

services:
  db:
    image: postgres
    ports:
      - "5432:5432"
  web:
    build: .
    command: python3 manage.py collectstatic --noinput
    command: python3 manage.py migrate --noinput
    command: python3 manage.py runserver 0.0.0.0:8000
    env_file: .env
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

entrypoint.sh

#!/bin/bash

# Collect static files
echo "Collect static files"
python manage.py collectstatic --noinput

# Apply database migrations
echo "Apply database migrations"
python manage.py migrate

# Start server
echo "Starting server"
python manage.py runserver 0.0.0.0:8000

Michael Barany · Accepted Answer · 2018-10-22 22:31:35Z

13

That is because you can only have one command.

You can combine multiple commands like this:

command: sh -c "python3 manage.py collectstatic --noinput && python3 manage.py migrate --noinput && python3 manage.py runserver 0.0.0.0:8000"

Alternatively as you mentioned the entrypoint, you can specify the entrypoint in the Dockerfile or in docker-compose.yml. Make sure to remove the commands as you won't need them anymore.

Here's a good article on entrypoint vs cmd vs run: http://goinbigdata.com/docker-run-vs-cmd-vs-entrypoint/

edited Oct 22, 2018 at 22:31

answered Oct 22, 2018 at 22:23

Michael Barany

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3 Comments

Michael Barany Over a year ago

it starts a new shell. this is a docker limitation if you want to run multiple commands after each other with &&

Joey Coder Over a year ago

Ah ok great, understood. I now tried the other way and added entrypoint: /code/docker-entrypoint.sh to my docker-compose. Dockerfile I kept unchanged. However, I always receive Cannot start service db: driver failed programming external connectivity on endpoint. Do you have any idea why it doesn't work?

Michael Barany Over a year ago

that's probably because you're trying to bind to the host's port on 5432, but there's already something running on that port

basquiatraphaeu · Accepted Answer · 2021-06-05 19:57:12Z

0

Alternatively, to Michael's answer, you could've used the wrapper syntax as indicated on the docs.

version: "2"
services:
  web:
    build: .
    ports:
      - "80:8000"
    depends_on:
      - "db"
    command: ["./wait-for-it.sh", "db:5432", "--", "python", "app.py"]
  db:
    image: postgres

More:

Control startup and shutdown order in Compose

answered Jun 5, 2021 at 19:57

basquiatraphaeu

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