PyMySQL can't connect to MySQL on localhost

user_821779 0
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I'm trying to connect to MySQL on localhost using PyMySQL:

import pymysql
conn = pymysql.connect(db='base', user='root', passwd='pwd', host='localhost')

but (both on Python 2.7 and Python 3.2) I get the error:

socket.error: [Errno 111] Connection refused

pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' (111)")

I'm sure mysqld is running because I can connect using mysql command or phpMyAdmin. Moreover, I can connect using MySQLdb on Python 2 with nearly the same code:

import MySQLdb
conn = MySQLdb.connect(db='base', user='root', passwd='pwd', host='localhost')

It seems that the problem is on PyMySQL side rather than MySQL but I have no idea how to solve it.

mysql-error-2003 mysql python
11 Answers

I met the same question and my solution is as follows:

  1. Run ssh -fN -L 3307:mysql_host:3306 ssh_user@ssh_host in my terminal.
  2. Then input your ssh password
  3. conn = pymysql.connect(db='base', user='root', passwd='pwd', host='localhost')

This error occurs because database does not support link directly.

user_79550720

I asked why socket worked but not TCP and the answer was that bind-address in /etc/my.cnf was not set correctly. This could be your problem too since the socket methods works just fine but the TCP one does not.

user_2327940
user_48340420

This worked for me:

import pymysql

db = pymysql.connect(host="localhost",port=8889,user="root",passwd="root")
cursor=db.cursor()
cursor.execute("SHOW DATABASES")
results=cursor.fetchall()
for result in results:
    print (result)

if you want to find the port # go to mysql in terminal, and type:

SHOW VARIABLES WHERE Variable_name = 'hostname';
SHOW VARIABLES WHERE Variable_name = 'port';
user_135531370

I had this same problem on AWS - and turns out that my security group was blocking the connection. I temporarily opened up all connections and voila! It connected!

Do you have any type of FW or host-based FW that could be blocking the connection? I thought it was my code and all was fine. Also check the port you are connecting on.

user_171545530

If you are using Docker, you might need to use host.docker.internal instead of localhost.

user_32383150

I managed to solve my issue by using the port without any quotation like so:

port = 3306,
user_105643590
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