500内部服务器错误 - 发生在连接到MySQL时（部署在服务器上）

Question

我正在开发一个使用Flask和MySQL的数据库。在本地主机：5000一切正常。

但是，当我试图部署它在真正的服务器上。发生500内部服务器错误。只有当我访问连接到数据库的任何路由时，才会出现此错误。

我正在使用wsgi，nginx进行自托管部署。

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#!/usr/bin/python3 
from flask import Flask, render_template, flash, request, redirect, url_for, session, logging 
from flask_mail import Mail, Message 
from flask_mysqldb import MySQL 
from wtforms import Form, StringField, TextAreaField, PasswordField, validators 
from passlib.hash import sha256_crypt 
from functools import wraps 

app =Flask(__name__) 
# Option 1: app.debug = True (allow to auto refresh server) 

# Config MySQL 
app.config['MYSQL_HOST'] = 'localhost' 
app.config['MYSQL_USER'] = 'root' 
app.config['MYSQL_PASSWORD'] = '123' 
app.config['MYSQL_DB'] = 'myflaskapp' 
app.config['MYSQL_CURSORCLASS'] = 'DictCursor' # by default the data set in MySQL will be in tuple; this one line of code sets the data set to dictionary structure 

# init MYSQL 
mysql = MySQL(app) 

@app.route('/blog') 
def blog(): 
    # Create cursor 
    cur = mysql.connection.cursor() 

    # Get articles 
    result = cur.execute("SELECT * FROM articles") 

    articles = cur.fetchall() 

    if result > 0: 
     return render_template('blog.html', articles=articles) 
    else: 
     msg = "No Articles Found" 
     return render_template('blog.html', msg = msg) 

    # Close connection 
    cur.close() 

# Register Form Class 
class RegisterForm(Form): 
    name = StringField('Name', [validators.Length(min=1, max=50)]) 
    username = StringField('Username', [validators.Length(min=4, max=25)]) 
    email = StringField ('Email', [validators.Length(min=6, max=50)]) 
    password = PasswordField ('Password', [ 
     validators.DataRequired(), 
     validators.EqualTo('confirm', message='Passwords do not match.') 
    ]) 
    confirm = PasswordField('Confirm Password') 

# Admin Register 
@app.route('/register', methods=['GET', 'POST']) 
def register(): 
    form = RegisterForm(request.form) 
    if request.method == 'POST' and form.validate(): 
     name = form.name.data 
     email = form.email.data 
     username = form.username.data 
     password = sha256_crypt.encrypt(str(form.password.data)) 

     # Create cursor 
     cur = mysql.connection.cursor() 

     # Execute query 
     cur.execute("INSERT INTO users(name, email, username, password) VALUES(%s, %s, %s, %s)", (name, email, username, password)) 

     # Commit to DB 
     mysql.connection.commit() 

     # Close connection 
     cur.close() 

     flash('You are now registered and can log in.', 'green') 

     return redirect(url_for('index')) 

     return render_template('register.html') 

    return render_template('register.html', form=form) 

# Admin Login 
@app.route('/login', methods = ['GET', 'POST']) 
def login(): 
    if request.method == 'POST': 
     # Get Form Fields 
     username = request.form['username'] 
     password_candidate = request.form ['password'] 

     # Create cursorcur 
     cur = mysql.connection.cursor() 

     # Get user by username 
     result = cur.execute("SELECT * FROM users WHERE username = %s", [username]) 

     if result > 0: 
      # Get stored hash 
      data = cur.fetchone() 
      password = data['password'] 

      # Compare Passwords 
      if sha256_crypt.verify(password_candidate, password): 
       # Passed 
       session['logged_in']= True 
       session['username'] = username 

       flash('You are now logged in', 'green') 
       return redirect(url_for('blog')) 

      else: 
       error = 'Invalid login' 
       return render_template('login.html', error = error) 

      # Close connection 
      cur.close() 
     else: 
      error = 'Username not found' 
      return render_template('login.html', error = error) 

    return render_template('login.html') 

if __name__ == '__main__': 
    app.secret_key='secert123456' 
    app.run(host='0.0.0.0', port=6000, debug=True) 

Answer 1

检查您的flaskSQL包正在使用您的SQL设置。服务器上的设置可能需要与本地计算机上的设置不同。