Failed to start MySQL 8.0 database server.

原因

在mysql錯誤日志里出現：The innodb_system data file ‘ibdata1’ must be writable，字面意思：ibdata1必須可寫

查看日志報錯，文件夾無寫入權限

cat /var/log/mysqld.log

解決

查找文件路徑

find / -name ibdata1

授予文件夾權限

chmod -R 777 /var/lib/mysql
chown mysql:mysql -R /var/lib/mysql

啟動MySQL

systemctl start mysqld.service
// 查看MySQL狀態
systemctl status mysqld.service