今天重啟mysql發現報錯如下：
$ sudo service mysqld restart
Redirecting to /bin/systemctl restart mysqld.service
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details
解決思路：查看mysql error log
vim /etc/my.cnf
日志文件位置如下：
log-error=/var/log/mysqld.log
less /var/log/mysqld.log
發現如下報錯信息
mysqld: File '/var/log/mysql/mysql-bin.index' not found (OS errno 13 - Permission denied)
2020-05-28T07:43:55.744384Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.20) starting as process 17788
2020-05-28T07:43:55.747675Z 0 [ERROR] [MY-010119] [Server] Aborting
發現是沒有權限執行導致的重啟失敗。添加權限，問題解決
sudo chmod -R 777 /var/log/mysql/*