Easy access to a script for detecting MySQL status

The following script uses the namp scanning tool. Therefore, if the nmap scanning tool is not installed in the system, you must first install the tool.
Script functions:

First, check whether the mysql port exists normally. If the port does not exist, start the mysql service. Of course, the script to be started is located in a different path according to your installation path. If the port exists, if the mysql service is running, check the mysql status and whether the connection is normal. If the connection is normal, mysql is normal and no processing is performed. If the connection fails, all mysql processes are killed, then, start the mysql service. Why do we need to kill the process and resume it normally? Sometimes mysql cannot be shut down normally, so it cannot be restarted normally. Therefore, it is safe to kill the process, then start the service. (

#! /Bin/bash

/Usr/bin/nmap localhost | grep 3306

If [$? -Eq 0]

Then

/Usr/local/mysql/bin/mysql-uxxxxx-pxxxxxx -- connect_timeout = 5-e "show databases ;"

If [$? -Ne 0]

Then

/Bin/ps aux | grep mysql | grep-v grep | awk '{print $2}' | xargs kill-9

/Usr/local/mysql/bin/mysqld_safe -- user = mysql &>/dev/null

Fi

Else

/Usr/local/mysql/bin/mysqld_safe -- user = mysql &>/dev/null

Fi