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$ sudo apt-get update

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$ sudo apt-get install apt-transport-https ca-certificates curl software-properties-common

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$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

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$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

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$ sudo apt-get update
$ sudo apt-get install docker-ce

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# ʹÓûù´¡¾µÏñ
FROM ubuntu:latest

# ÉèÖÃ×÷ÕßÐÅÏ¢
MAINTAINER Your Name <your@email.com>

# ×°ÖÃÏà¹ØÒÀÀµ
RUN apt-get update && apt-get install -y 
    python3 
    python3-pip

# ÉèÖÃÊÂÇéĿ¼
WORKDIR /app

# ½«Ó¦ÓóÌÐòÌí¼Óµ½¾µÏñÖÐ
COPY . /app

# ×°ÖÃÓ¦ÓóÌÐòÒÀÀµ
RUN pip3 install -r requirements.txt

# ÉèÖÃÈÝÆ÷Æô¶¯ÏÂÁî
CMD ["python3", "app.py"]

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$ docker build -t myapp:latest .

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$ docker run -d -p 80:5000 myapp:latest

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version: '3'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    image: myapp:latest
    ports:
      - "80:5000"

  load_balancer:
    image: nginx:latest
    ports:
      - "80:80"
    volumes:
      - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
    depends_on:
      - app

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upstream app_servers {
    server app:5000;
}

server {
    listen 80;
    location / {
        proxy_pass http://app_servers;
    }
}

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$ docker-compose up --scale app=3

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