PyMySQL can't connect to MySQL on localhost

Question

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.

Asked By: O'Fermah

||

Source

Answer 1

Seems like changing localhost to 127.0.0.1 fixes the error, at least in my configuration.
If it doesn’t, I would look for errors in tcp sockets connection and, of course, post it as a bug in pymysql bugtrack.

Answered By: BrainStorm

Answer 2

Two guesses:

Run mysqladmin variables | grep socket to get where the socket is located, and try setting up a connection like so:
```
pymysql.connect(db='base', user='root', passwd='pwd', unix_socket="/tmp/mysql.sock")
```
Run mysqladmin variables | grep port and verify that the port is 3306. If not, you can set the port manually like so:
```
pymysql.connect(db='base', user='root', passwd='pwd', host='localhost', port=XXXX)
```

Answered By: Lucas Wiman

Answer 3

I solved the issue by replacing localhost with 127.0.0.1 and changing the password to my MYSQL database password as shown below;

conn = pymysql.connect(
    host = '127.0.0.1',
    port = 3306,
    user = 'root',
    passwd = 'XXXXXXXXX',
    db = 'mysql'
)

Answered By: Byron Kiriibwa

Answer 4

You need to add the port to the connection as well. Try this and it works fine.

pymysql(Module Name).connect(host="localhost", user="root", passwd="root", port=8889, db="db_name")

Answered By: Satheesh Polu

Answer 5

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

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

This error occurs because database does not support link directly.

Answered By: wolfog

Answer 6

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.

Answered By: Sardathrion – against SE abuse

Answer 7

Those who are strugging to connect localhost MySQL from dockerised flask-sqlalchemy or using pymysql, pls look into this thread, very usefull How to connect locally hosted MySQL database with the docker container

Answered By: Selvaraj S.

Answer 8

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';

Answered By: Ali Jubran

Answer 9

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.

Answered By: cciegirl2012

Answer 10

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

Answered By: cdutra

Answer 11

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

port = 3306,

Answered By: Rojin

PyMySQL can't connect to MySQL on localhost

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