docker-compose在docker-compose.yml中具有多个服务的构建

Question

I am new to docker-compose, I have built a simple web application using flask and redis and it works fine in my localhost, my question is how to push this web app including the python and redis images to docker hub and pull that image from a different machine.

I usually do docker-compose build, docker push

version: '3'
services:
 web:
  build: .
  image: "alhaffar/flask_redis_app:2.0"
  ports:
   - "8088:5000"
  depends_on:
   - redis
 redis:
  image: "redis:alpine"

the Dockerfile

FROM python:3.7

# CHANGE WORKIN DIR AND COPY FILES
WORKDIR /code
COPY . /code

# INSTALL REQUIRED PACAKGES
RUN pip install --upgrade pip
RUN pip install -r requirements.txt

# RUN THE APP
CMD ["python", "./main.py"]

when I try to pull the image into a different machine and issue docker run, it runs only the python image without redis image.

how I can run all images

Answer 1

Dockerhub and other docker registries work with images. Docker-compose is just an abstraction which helps to set up a bunch of images, that can work together, by using one configuration-file - docker-compose. There is nothing like docker-compose registries. Then if you have your docker-compose file on the other machine you just use docker-compose up and images should be pulled - assuming they are published to some registry (public/private). Image with your app should be published by you and refis will be taken form dockerhub registry, if you are using redis official image.

Docker-compose is helpful when you are doing some local development and want to set up your working environment quickly. If you want to set up this environment on other machine you would have to share the docker-compose file with them and have the docker and docker-compose installed on that other machine.

If your docker-compose is configured to build some image on start, you can still push this image using docker-compose push command.

Answer 2

With your Docker Compose Script you do two things:

1. Build your Flask App —> Image 1
2. Pull and run Redis —> Image 2

If you push Image 1 to DockerHub and pull it on an other machine, you are missing the second Image.

What you want to do is run the Docker compose script on the second machine without the build line.