Remotely connect to MySQL with Python mysql.connec

问题:

The following code (ran from a different machine than the mysql server, within the same LAN), to locally connect to MySQL database using Python3 and mysql.connector works:

import mysql.connector
cnx = mysql.connector.connect(host='192.168.0.24', database='import_test',user='user_builder', password='password***', port=3309)

However, the following code, to remotely connect to the same database, does NOT work:

import mysql.connector
cnx = mysql.connector.connect(host='http://imaginarywebsite.ddns.net', database='import_test',user='user_builder', password='password***', port=3309)

Instead, I receive the following error:

File "C:\Users\****\AppData\Roaming\Python\Python34\site-packages\mysql\connector\network.py", line 464, in open_connection
     errno=2003, values=(self.get_address(), _strioerror(err)))
mysql.connector.errors.InterfaceError: 2003: Can't connect to MySQL server on 'http://imaginarywebsite.ddns.net:3309' (11004 getaddrinfo failed)

Here is an extract of my my.cnf file:

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

[mysqld]
innodb_buffer_pool_size=4G
innodb_log_file_size=1024M
innodb_read_io_threads=64
innodb_write_io_threads=64
innodb_io_capacity=7000
innodb_thread_concurrency=0

port            = 3309
bind-address    = 0.0.0.0

So, here is what currently works:

• Connect locally to the databse using 192.168.0.24:3309 address, so I am sure the problem does not come from 'privileges granting' or any login/password/port error.
• Connect remotely via phpmyadmin using http://imaginarywebsite.ddns.net/phpmyadmin, so I am sure the problem does not come from my DNS server.

And here are my 3 questions :

1. Any Idea where the problem can come from?
2. Should using SSH connection be a solution to my problem?
3. If SSH is the solution, is it possible to use SSH parameters through mysql.connector since it does not seem to be presented in the official documentation?

Thanks.

回答1:

If you're running PHPMyAdmin on the same server that your mysql daemon is running on, here's what's happening: you have your webserver configured to accept connections from all interfaces, but mysql configured to only accept local connections. Since PHPMyAdmin is colocated wit mysql, it will only be making local connections which is why it works but your code doesn't.

So, double check that your mysql daemon is configured to listen interfaces. You should have a line something like bind-address=0.0.0.0 in your mysql.cnf file. See this answer for more details.

回答2:

Try to edit you non working example to this (no http in the host)

import mysql.connector
cnx = mysql.connector.connect(host='imaginarywebsite.ddns.net', database='import_test',user='user_builder', password='password***', port=3309)

回答3:

Actually the answer was to use the global IP address of my server instead of the domain name, probably an issue of name management.

Replacing host='http://imaginarywebsite.ddns.net' by 'host=85.23.56.****" made it work.