使用OpenTSDB在CentOS上监控MySQL

本文将介绍如何使用OpenTSDB在CentOS上监控MySQL，包括示例代码、代码释义和总结。

示例代码

以下是示例代码：

#!/bin/bash
timestamp=`date +%s`
mysql_status=`mysqladmin -h localhost -u root -p password status`
Questions=`echo "$mysql_status" | awk '{print $4}'`
Com_update=`echo "$mysql_status" | awk '{print $8}'`
Slow_queries=`echo "$mysql_status" | awk '{print $10}'`
Com_select=`echo "$mysql_status" | awk '{print $12}'`
Com_insert=`echo "$mysql_status" | awk '{print $14}'`
Com_delete=`echo "$mysql_status" | awk '{print $16}'`
Com_replace=`echo "$mysql_status" | awk '{print $18}'`
Bytes_sent=`echo "$mysql_status" | awk '{print $20}'`
Bytes_received=`echo "$mysql_status" | awk '{print $22}'`
Open_files=`echo "$mysql_status" | awk '{print $24}'`
Open_tables=`echo "$mysql_status" | awk '{print $26}'`
Threads_connected=`echo "$mysql_status" | awk '{print $28}'`
Threads_running=`echo "$mysql_status" | awk '{print $30}'`
mysql -h localhost -u root -ppassword -e "show slave status\G" > /root/mysql_slave_status
Seconds_behind_master=`cat /root/mysql_slave_status | grep "Seconds_Behind_Master" | awk '{print $2}'`
echo "put mysql.qps $timestamp $Questions" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.com_update $timestamp $Com_update" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.slow_queries $timestamp $Slow_queries" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.com_select $timestamp $Com_select" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.com_insert $timestamp $Com_insert" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.com_delete $timestamp $Com_delete" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.com_replace $timestamp $Com_replace" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.bytes_sent $timestamp $Bytes_sent" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.bytes_received $timestamp $Bytes_received" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.open_files $timestamp $Open_files" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.open_tables $timestamp $Open_tables" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.threads_connected $timestamp $Threads_connected" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.threads_running $timestamp $Threads_running" | /usr/bin/nc -w 1 localhost 4242
echo "put mysql.seconds_behind_master $timestamp $Seconds_behind_master" | /usr/bin/nc -w 1 localhost 4242

以上代码的作用是获取MySQL状态信息，并将其存储到OpenTSDB中。

具体来说，代码首先获取当前时间戳，并使用mysqladmin命令获取MySQL状态信息。然后，通过awk命令获取不同指标的值，如Questions、Com_update、Slow_queries等。接着，将这些指标值与时间戳一起存储到OpenTSDB中。

在存储之前，还需要将MySQL从库状态信息存储到/root/mysql_slave_status文件中，并使用grep和awk命令获取Seconds_Behind_Master的值，即MySQL从库与主库的延迟时间。

最后，将所有指标值与时间戳一起通过nc命令发送到OpenTSDB服务器上，端口为4242。

通过以上步骤，我们就可以使用OpenTSDB在CentOS上监控MySQL了。具体来说，我们可以定期运行以上示例代码，以便获取MySQL的状态信息，并将其存储到OpenTSDB中，从而实现监控和分析MySQL的目的。

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