尝试连接到 mysql 服务器时连接被拒绝

Question

I'm trying to connect my flask project to a mysql server using peewee. When I declare the database using the information I have on my server:

app = Flask(__name__)

mydb = MySQLDatabase(os.getenv("MYSQL_DATABASE"),
    user=os.getenv("MYSQL_USER"),
    password=os.getenv("MYSQL_PASSWORD"),
    host=os.getenv("MYSQL_HOST"),
    port=3306
)

print(mydb)

everything works fine, I run the flask project from the vps terminal and I get the <peewee.MySQLDatabase object at x> line, meaning that the connection was succesful, or at least that's my understanding. But when I try to connect from the python file (mydb.connect()) to add some tables everything stops working and I get the error message:

peewee.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")

The mysql server is running on my local computer and the project is located on the vps but that shouldn't be a problem, especially because I can connect to it before changing the python file.

Python

import os
from flask import Flask
from peewee import *

app = Flask(__name__)

mydb = MySQLDatabase(os.getenv("MYSQL_DATABASE"),
    user=os.getenv("MYSQL_USER"),
    password=os.getenv("MYSQL_PASSWORD"),
    host=os.getenv("MYSQL_HOST"),
    port=3306
)

print(mydb)

mydb.connect() #When I add this line everything stops working

Why is it that with only that line my code doesn't work?

Answer 1

I'm very skeptical that you will be able to connect from the flask app running on some remote server, to the mysql running on your laptop. How is traffic routed?

Also you're wrong about this:

print(mydb)  # This does not mean you can connect to the database.

mydb.connect() # This is when an actual connection is created.

Try running both on the same computer. If you absolutely must run flask on your VPS and mysql on your workstation, you will need to tunnel the traffic somehow or use a vpn.