使用dockercompose的Nginx reverseproxy for python应用程序

Question

您好，我正在尝试使用nginx反向代理创建python应用程序和redis，但当我运行docker compose文件时，它会运行所有容器，但当我转到localhost:90时，它会显示nginx页面，而不是python文件中定义的页面。我正在学习这个教程here

Docker文件：

FROM python:3
RUN pip install flask

Python文件：

from flask import Flask

app = Flask(__name__)

# to connect redis 
# use host "redis_app"
# use port "6379"
# use password "add_password_here"

@app.route('/')
def hello():
    return 'Hello NGINX reverse proxy'

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=5000)

Docker编写文件

version: '3.1'
services:
    nginx:
        image: nginx:latest
        container_name: nginx_reverseproxy
        depends_on:
            - flask
        volumes:
            - ./nginx.conf:/etc/nginx/conf.d/default.conf
        networks:
            - docker-network
        ports:
            - 90:80
    flask:
        build:
            context: ./
            dockerfile: Dockerfile
        image: flask:v1
        container_name: flask_webapp
        volumes:
            - ./:/flask_code/
        environment:
            - FLASK_APP=/flask_code/main.py
        command: python /flask_code/main.py
        networks:
            docker-network:
                aliases:
                    - flask_webapp
        ports:
            - 8080:5000
        depends_on:
                - redis
    redis:
        image: redis
networks:
    docker-network:

nginx.conf

server {
    listen 90;
    server_name localhost;
location / {
        proxy_pass http://flask_webapp:5000/;
        proxy_set_header Host "localhost";
    }
}

Answer 1

首先，您需要创建桥接网络。假设网络名称为my_project_network

docker network create  driver=bridge my_project_network

---

现在我们将创建python应用程序

index.py

from flask import Flask

app = Flask(__name__)

# to connect redis 
# use host "redis_app"
# use port "6379"
# use password "add_password_here"

@app.route('/')
def hello():
    return 'Hello NGINX reverse proxy'

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=5000)

---

我们将使用烧瓶，所以我们需要安装它。我们可以通过创建requirements.txt文件并使用pip3 install -r requirements.txt来安装它

requirements.txt

flask==1.1.2

---

现在将为python应用程序创建Dockerfile

Dockerfile

FROM python:3

RUN mkdir -p /my_project

WORKDIR /my_project

COPY requirements.txt ./

RUN pip3 install -r requirements.txt

COPY . .

CMD [ "python3", "./index.py"]

---

现在将创建nginx配置文件

default.conf

server {
    listen 80;
    server_name localhost;
    location / {
        proxy_pass http://flask_app:5000/;
        proxy_set_header Host "localhost";
    }
}

---

现在将创建docker-compose文件

docker-compose.yml

version: "3.7"

services:
  nginx_app:
    image: nginx:latest
    depends_on:
      - flask_app
    volumes:
      - ./default.conf:/etc/nginx/conf.d/default.conf
    ports:
      - 8080:80
    networks:
      - my_project_network

  flask_app:
    build:
      context: .
      dockerfile: Dockerfile
    expose:
      - 5000
    depends_on:
      - redis_app
    networks:
      - my_project_network

  redis_app:
    image: redis:latest
    command: redis-server  requirepass add_password_here
    expose:
      - 6379
    networks:
      - my_project_network

networks:
  my_project_network:
    external: true

---

现在我们完成了所有文件。所以我们将运行docker compose

docker-compose up  build -d

要阻止它，只需使用

docker-compose stop

---

结果

---

注意：您可以用所需的任何端口替换端口8080

---

注意：我创建了my_project_network以便可以连接docker中的服务并彼此组合。但是我可以不用out my_project_network来做这件事。但我更喜欢使用my_project_network将另一个docker compose中的任何服务连接到此docker compose服务

假设我们有./anther_project/docker-compose.yml

version: "3.7"

services:
  flask_app_v2:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - 5001:5001
    networks:
      - my_project_network

networks:
  my_project_network:
    external: true

flask_app_v2可以连接到redis_app，因为它们都在同一个网络中 .

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