Starting MySQL... ERROR! The server quit without updating PID file (/home/mysql-5.6.43/data/localhost.localdomain.pid).

啟動MySQL出現如下錯誤

May 21 20:37:58 localhost mysqld: Starting MySQL... ERROR! The server quit without updating PID file (/home/mysql-5.6.43/data/localhost.localdomain.pid).
May 21 20:37:58 localhost systemd: mysqld.service: control process exited, code=exited status=1
May 21 20:37:58 localhost systemd: Failed to start LSB: start and stop MySQL.
May 21 20:37:58 localhost systemd: Unit mysqld.service entered failed state.
May 21 20:37:58 localhost systemd: mysqld.service failed.

試了網上很多解決辦法都不行

MySQL版本：mysql-5.6.43

切換到MySQL  data dir（MySQL的數據文件目錄下）

獲取MySQL用戶運行的MySQL進程的pid，然后導入到localhost.localdomain.pid文件里面

# echo `ps aux | grep mysql | grep "user=mysql" | grep -v "grep" | awk '{print $2}'`>> redhat.pid

# mv redhat.pid localhost.localdomain.pid

# chown mysql:mysql localhost.localdomain.pid

重啟MySQL

# systemctl restart mysqld

問題已經解決，MySQL啟動成功

參考博客：

MySQL下PID文件丟失的相關錯誤的解決方法

http://www.imooc.com/article/265437

MySQL配置文件my.cnf的理解

https://www.cnblogs.com/langdashu/p/5889352.html