1. When starting MySQL service, report MySQL Server PID file could not be found
Solution: Create in the /var/lock/subsys/mysql path: ip+.pid of the node where mysql is located (for example, linux1.pid), and add 4396 to the file
2. Report service mysql status MySQL is not running, but lock file(/var/lock/subsys/mysql[Failure]) is abnormal
Solution: Create in the /var/lib/mysql directory:: ip+.pid of the node where mysql is located (for example, linux1.pid), and modify the file permissions to 777