執行mysqld --initialize后報錯
報錯內容：
019-04-24 18:07:59 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2019-04-24 18:07:59 0 [Note] mysqld (mysqld 5.6.43) starting as process 16404 ...
2019-04-24 18:07:59 16404 [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root!
2019-04-24 18:07:59 16404 [ERROR] Aborting
2019-04-24 18:07:59 16404 [Note] Binlog end
2019-04-24 18:07:59 16404 [Note] mysqld: Shutdown complete
解決辦法：
使用vi /etc/my.cnf ，加上兩行：
explicit_defaults_for_timestamp=true
user=mysql （指定mysql用戶來啟動mysql服務）