Docker-从docker-compose运行映像

Question

I have set up a docker-compose.yml file that runs a web service along with postgres.

It works nicely when I run it with docker-compose up .

docker-compose.yml:

version: '3'

services:
  db:
    image: postgres
  web:
    build: .
    command: python manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

Dockerfile:

FROM python:3
RUN mkdir /code
WORKDIR /code
ADD requirements.txt /code/
RUN pip install -r requirements.txt
ADD . /code/

CMD ["python", "manage.py", "runserver"]

Is there any way to construct an image out of the services?

I tried it with docker-compose build, but running the created image simply freezes the terminal.

Thanks!

Answer 1

docker-compose is a container orchestration tool , albeit a simple one , and not a bundler of multiple images and preferences into one. In fact, such a thing does not even exists .

What happens when you run docker-compose up is that it effectively runs docker-compose build for those images that need to be built, web in your example, and then effectively replaces the build: . with image: web and executes the configuration as defined by the compose file.

So if you were to run docker-compose build manually and wanted to run the same configuration you have in the compose file manually, you would need to something along the lines of (in order)

• run docker-compose build or docker build -t web . to build the web image
• run docker run --name db postgres
• run docker run --name web -v .:/code -p 8000:8000 web python manage.py runserver 0.0.0.0:8000