If you've recently upgraded to macOS Sequoia 15.0 and are experiencing issues with MySQL not running, you're not alone. This guide will walk you through the steps to resolve this issue, especially if you're upgrading to MySQL version 9 or above.
You might encounter error messages like this:
ERROR 2002 (HY000): Can't connect to local server through socket '/tmp/mysql.sock' (2)
The root cause lies in the significant architectural changes introduced in MySQL 9.0. Upgrading directly from older MySQL versions (pre-8.4) to 9.0 or later often bypasses crucial compatibility steps, leading to startup failures.