即使mysqld在端口3306上运行，也无法连接到'localhost：3306'上的MySQL服务器

Posted 2021-04-04

尝试使用mysql-connector通过python连接到mysql，但是我收到此错误：

 Traceback (most recent call last):
 File "/var/www/html/cloudlab/env/lib/python3.6/site-packages/mysql/connector/network.py", line 509, in open_connection
    self.sock.connect(sockaddr)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./get_stf_file_names.py", line 26, in update_aws_script_details
    database="service_portal"
  File "/var/www/html/cloudlab/env/lib/python3.6/site-packages/mysql/connector/__init__.py", line 179, in connect
    return MySQLConnection(*args, **kwargs)
  File "/var/www/html/cloudlab/env/lib/python3.6/site-packages/mysql/connector/connection.py", line 95, in __init__
    self.connect(**kwargs)
  File "/var/www/html/cloudlab/env/lib/python3.6/site-packages/mysql/connector/abstracts.py", line 716, in connect
    self._open_connection()
  File "/var/www/html/cloudlab/env/lib/python3.6/site-packages/mysql/connector/connection.py", line 206, in _open_connection
    self._socket.open_connection()
  File "/var/www/html/cloudlab/env/lib/python3.6/site-packages/mysql/connector/network.py", line 512, in open_connection
    errno=2003, values=(self.get_address(), _strioerror(err)))
mysql.connector.errors.InterfaceError: 2003: Can't connect to MySQL server on 'localhost:3306' (111 Connection refused)

我检查了mysqld是否正在使用端口3306，它是：

netstat -lnp | grep 3306

这给了：

tcp        0      0 my-ip:3306      0.0.0.0:*               LISTEN      12003/mysqld

我也试过这个命令，它完美地工作：

mysql -h localhost -u root -p

（就像在我可以使用此连接到数据库）

我试图通过以下方式访问数据库：

mydb = mysql.connector.connect(host="localhost",user="****",
    passwd="****",
    database="**********"
    )
    cursor = mydb.cursor(dictionary=True)

如果我将上面命令中的localhost更改为my-ip，那么它可以正常工作。有什么我做错了吗？

答案

Localhost是一个ip 127.0.0.1。 你的mysql实例是在ip上还是在外部上监听？