How to Fix MySQL Error mysqld: File './binlog.index' not found (OS errno 13 - Permission denied)

MySQL, as a popular database management system (DBMS), is often the backbone of web and business applications. Despite its reliability, MySQL users can encounter various problems, one of which is a fairly common error related to the binlog file, namely "mysqld: File './binlog.index' not found (OS errno 13 - Permission denied)".

This error message indicates that the MySQL server cannot find or access the binlog.index file, and is generally caused by a permissions denied issue. This issue can arise because the MySQL server does not have enough permissions to read or write the binlog.index file.

In this tutorial, we will explain in detail the common causes of this error, and provide practical steps to resolve permission issues with the binlog.index file. By following this guide, you'll be able to fix this issue and get your MySQL server back in working order.

Please login to the server as root. Backup and Snapshot the server as a preparatory step. Then move the binlog.index file to another name, for example binlog.index.old. After that we vacuum the binary log from mysql before execution time. for example:

mv /var/lib/mysql/binlog.index /var/lib/mysql/binlog.index.old
mysql PURGE BINARY LOGS BEFORE 'YYYY-MM-DD HH:MM:SS'

Adjust the YYYY-MM-DD HH:MM:SS time to the time of execution.