Python: "mysql.connector.errors.InterfaceError: 2003" when my port is a number-CodePudding

I am trying to use mysql with python in an alpine container and I am seeing the following error for a simple script that works fine on my laptop. Its saying a number not a string is required (looking at other posts this number is the port):

bash-5.1# python3 test.py 
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/mysql/connector/network.py", line 550, in open_connection
    socket.SOL_TCP)
  File "/usr/local/lib/python3.7/socket.py", line 752, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name does not resolve

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    database='defaultdb'
  File "/usr/local/lib/python3.7/site-packages/mysql/connector/__init__.py", line 273, in connect
    return MySQLConnection(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/mysql/connector/connection.py", line 116, in __init__
    self.connect(**kwargs)
  File "/usr/local/lib/python3.7/site-packages/mysql/connector/abstracts.py", line 1052, in connect
    self._open_connection()
  File "/usr/local/lib/python3.7/site-packages/mysql/connector/connection.py", line 494, in _open_connection
    self._socket.open_connection()
  File "/usr/local/lib/python3.7/site-packages/mysql/connector/network.py", line 566, in open_connection
    errno=2003, values=(self.get_address(), _strioerror(err)))
mysql.connector.errors.InterfaceError: 2003: Can't connect to MySQL server on '%-.100s:%u' (%s) (Warning: %u format: a number is required, not str)

bash-5.1# pip3 list
Package                Version
---------------------- -----------
certifi                2022.5.18.1
charset-normalizer     2.0.12
idna                   3.3
mysql                  0.0.3
mysql-connector-python 8.0.29
mysqlclient            2.1.0
pip                    22.0.4
protobuf               4.21.0
requests               2.27.1
setuptools             57.5.0
tabulate               0.8.9
urllib3                1.26.9
wheel                  0.37.1

Here's the script. As you can see I am absolutely using a number here:

bash-5.1# cat test.py 
import mysql.connector

mydb = mysql.connector.connect(
  host="mydbname-do-user-12345678-0.b.db.ondigitalocean.com",
  user="myadmin",
  password="mypassword",
  port=int(12374),
  database='defaultdb'
)

print(mydb)

Here is my dockerfile:

# syntax=docker/dockerfile:1

# Alpine is chosen for its small footprint
# compared to Ubuntu

FROM python:3.7-alpine3.16
COPY --from=golang:1.14-alpine /usr/local/go/ /usr/local/go/

ENV PATH="/usr/local/go/bin:${PATH}"

RUN apk -v --update add \
      util-linux \
      jq \
      curl \
      python3 \
      py-pip \
      groff \
      bash \
      go \
      mysql \
      gcc musl-dev mariadb-connector-c-dev \
      && \
      pip3 install --upgrade requests tabulate mysql mysql-connector-python && \
      apk -v --purge del && \
      rm /var/cache/apk/*

WORKDIR /app
RUN mkdir /app/data/
COPY ./*.py /app/
RUN chmod  x /app/*
COPY ./data/ /app/data/

What stumps me is that it works fine on my laptop. What do I need to add into my container to get this working? Am I missing some python packages? Even when I attempt to install all the same exact packages from my laptop onto the container, I still see the error.

Update: It seems there an issue with my host name, I have added one more like my own which is a db server from digital ocean.

Looking into it more seems to be like this. It seems that the python:3.7-alpine3.16 container has some dns issues.

CodePudding user response：

The error

socket.gaierror: [Errno -2] Name does not resolve

would indicate problems with the name resolution (for myhostname).

CodePudding user response：

I fixed this by finding the ip address with nslookup and then using that instead of the hostname.

bash-5.1#  nslookup "mydbname-do-user-12345678-0.b.db.ondigitalocean.com"
Server:   192.168.0.1
Address:  192.168.0.1:53

Non-authoritative answer:
Name: "mydbname-do-user-12345678-0.b.db.ondigitalocean.com"
Address: 1.2.3.4

** server can't find "mydbname-do-user-12345678-0.b.db.ondigitalocean.com": NXDOMAIN