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

启动MySQL出现如下错误

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.

试了网上很多解决办法都不行

MySQL版本：mysql-5.6.43

切换到MySQL  data dir（MySQL的数据文件目录下）

获取MySQL用户运行的MySQL进程的pid，然后导入到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

重启MySQL

# systemctl restart mysqld

问题已经解决，MySQL启动成功

参考博客：

MySQL下PID文件丢失的相关错误的解决方法

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

MySQL配置文件my.cnf的理解

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