python-3.x - docker 。无法建立新连接 : [Errno 111] Connection refused'

Question

我想将 post 请求从一个容器发送到另一个容器，两者都是 Flask 应用程序。

当我按下表单中的发送按钮时，我的请求无法发送并出现错误:

requests.exceptions.ConnectionError: HTTPConnectionPool(host='0.0.0.0', port=5000): Max 
retries exceeded with url: /users/ (Caused by 
NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fe0e5738ac0>: Failed to 
establish a new connection: [Errno 111] Connection refused'))

我试图在本地主机上运行它。当我使用 docker-compose up 时，一切正常，直到我尝试发送请求。

应用程序 1 代码(应用程序，我试图从中发送请求):

from settings import app, db
from flask import jsonify, request
from models import User     

@app.route('/users/', methods=['POST'])
def users_post():
    if request.json:
        new_user = User(
            email=request.json['email'], 
            first_name=request.json['first_name'], 
            last_name=request.json['last_name'], 
            password=request.json['password'])

        db.session.add(new_user)
        db.session.commit()
        return jsonify({'msg': 'user succesfully added'})
    else:
        return jsonify({'msg': 'request should be in json format'})



if __name__ == "__main__":
    app.run(debug=True, host='0.0.0.0')

dockerfile 容器 1:

FROM python:3

COPY . ./app

WORKDIR /app

RUN pip3 install -r requirements.txt

EXPOSE 5000 5050

CMD ["python3", "app.py"]

应用程序2代码:

@app.route('/', methods=['GET', 'POST'])
def users_get():
    if request.method == 'POST':
        request.form['email']
        data = {
            'email':request.form['email'], 
            'first_name':request.form['first_name'], 
            'last_name':request.form['last_name'], 
            'password':request.form['password']
        }
        r = requests.post('http://0.0.0.0:5000/users/', data=data)
        print(r.text)
    return render_template('index.html')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5050)

应用程序 2 中的 dockerfile 与第一个类似。

docker-compose

version: '3'

services:
  web:
    build: ./core
    command: python3 app.py
    volumes:
      - .:/core
    ports:
      - "5000:5000"
    links:
      - new_app

  new_app:
    build: ./new_app
    command: python3 app.py
    volumes:
      - .:/new_app
    ports:
      - "5050:5050"

我错过了什么？

Answer 1

app1 缺少端口，您应该添加它:
app.run(debug=True, host='0.0.0.0', port=5000)

当从 app2 调用 app1 时，你应该使用它的主机而不是 0.0.0.0 :
r = requests.post('http://web:5000/users/', data=data)