Why Can't I Connect to My Local MySQL Server Through the Socket '/tmp/mysql.sock' in Python, Despite the Server Running?

Troubleshooting MySQL Connection Error: "Can't Connect to Local MySQL Server Through Socket '/tmp/mysql.sock'"

Despite being able to establish connections to the MySQL server using the command line, an attempt to connect from a test suite in Python fails with the error:

OperationalError: (2002, "Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)")

Verifications such as running 'ps aux | grep mysql' to confirm server process existence and 'stat /tmp/mysql.sock' to check for the socket's presence do not reveal any issues. Furthermore, a debugger opened under the exception clause allows successful connections using the same parameters.

The problem manifests intermittently and switching to '127.0.0.1' as host results in a different error:

DatabaseError: Can't connect to MySQL server on '127.0.0.1' (61)

Solution:

Executing the following command resolved the issue:

sudo /usr/local/mysql/support-files/mysql.server start

Additional Considerations:

• If the above command fails, ensure that mysqld is running before attempting the connection.
• The fact that the client code is in Python does not appear to be relevant to the issue.

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