自己编写Nagios监控MySQL插件

主从监控插件编写：#!/bin/bash MYSQL=/usr/local/mysql/bin/mysql -uslave -pslave12345 -h127.0.0.1 -PVAR_LOG=/tmp/check_m

主从监控插件编写：
#!/bin/bash
MYSQL="/usr/local/mysql/bin/mysql -uslave -pslave12345 -h127.0.0.1 -P"
VAR_LOG=/tmp/check_mysql_status.log.$2 && >$VAR_LOG
function usage(){
cat <`basename $0` need at least value: `basename $0` -[s|m] port
第一个参数是 -s 那么以是检查从模式, -m就是检查主模式 不能省略
第二个参数是数据库端口，如3308 3309,不能省略
mysql权限，需执行如下SQL：grant replication client,super on *.* to 'slave'@'127.0.0.1' identified by 'slave12345';
EOF
exit 1
}
function check_mysql_status(){
#echo $MYSQL $@
echo "show status;" | $MYSQL$@ | perl -p -e 's/\s+(\w+)/="$1"/g' >> $VAR_LOG
#echo "$mysql_status"
}
function check_mysql_slave_status(){
#echo $MYSQL $@
echo "show slave status\G" | $MYSQL$@ | perl -p -e 's/:\s(.*)$/="$1"/g; s/^\s+//g; s/^\*.*\*//;' >> $VAR_LOG
}
function check_slave_results(){
if [ "$Slave_IO_Running" == "Yes" ] && [ "$Slave_SQL_Running" == "Yes" ];then
if [ $tmp_code -ne 0 ] && [ $Seconds_Behind_Master -gt 100 ] ;then
code=2
elif [ $Seconds_Behind_Master -lt 50 ] ;then
code=0
else
code=1
fi
else
code=2
fi
}
if [ $# -le 0 ] || [ "$1" == "-h" ];then
usage
fi
if [ "$1" == "-s" ];then
#echo "检查从模式"
check_mysql_slave_status $2
fi
code=0
check_mysql_status $2
. $VAR_LOG
PER_SECOND_QUESTION=`echo "$Uptime $Queries" | awk '{printf ("%4.3f") ,$2/$1}END{if($2/$1<0.05) exit 0 ;else exit 1;}'`
tmp_code=$?
if [ -z $Uptime ];then
echo "$MYSQL $@ 连接失败，请检查服务" && exit 2
fi
if [ "$1" == "-s" ];then ##输出不同的信息
check_slave_results
printf "主库:$Master_Host:$Master_Port Uptime:$Uptime Threads:$Threads_running Questions:$Questions Slow_queries:$Slow_queries Open_tables:$Open_tables Queries per second avg:%s Slave_IO_Running:$Slave_IO_Running Slave_SQL_Running:$Slave_SQL_Running Seconds_Behind_Master:$Seconds_Behind_Master|Threads=$Threads_running Questions=$Questions Slowqueries=$Slow_queries Opens=$Opened_tables Opentables=$Open_tables Queriespersecondavg=%s BehindMaster=$Seconds_Behind_Master" $PER_SECOND_QUESTION $PER_SECOND_QUESTION
else ##输出不同的状态信息
printf "Uptime:$Uptime Threads:$Threads_running Questions:$Questions Slow_queries:$Slow_queries Open_tables:$Open_tables Queries per second avg:%s|Threads=$Threads_running Questions=$Questions Slowqueries=$Slow_queries Opens=$Opened_tables Opentables=$Open_tables Queriespersecondavg=%s" $PER_SECOND_QUESTION $PER_SECOND_QUESTION
fi
exit $code

mysql连接数监控：（监控mysql的最大连接数（最大连接数小于1000报警），和当前连接数 ，，可用连接数少于50报警）
#!/bin/bash
#MYSQL="/usr/local/mysql/bin/mysql -unagios -pmonitor_slave#status -h$3 -P"
MYSQL="/usr/local/mysql/bin/mysql -unagios -pmonitor_slave#status -h127.0.0.1 -P"
VAR_LOG=/tmp/check_mysql_status_con_$2.log && >$VAR_LOG
#Threads_con_log=/tmp/check_mysql_tread_conn.log.$2 && >$Threads_con_log
#Max_conn_log=/tmp/check_mysql_max_con.log.$2 && >$Max_conn_log
function usage(){
cat <`basename $0` need at least value: `basename $0` -[s|m] port
first arg -s : monitor slave mode
-m : moitor master mode
second arg port: mysqld prot 3306 or 3307 or 3308 ...
mysql privilege :you neeed exec :grant replication client,super on *.* to 'slave'@'127.0.0.1' identified by 'slave12345';
EOF
exit 1
}
function check_mysql_status(){
#echo $MYSQL $@
echo "show status;" | $MYSQL$@ | perl -p -e 's/\s+(\w+)/="$1"/g' >> $VAR_LOG
#echo "$mysql_status"
}
function check_mysql_con_status(){
#echo $MYSQL $@
echo "show status like 'Threads_connected';" | $MYSQL$@ | perl -p -e 's/\s+(\w+)/="$1"/g' >> $VAR_LOG
echo "show variables like 'max_connections';" |$MYSQL$@ | perl -p -e 's/\s+(\w+)/="$1"/g' >> $VAR_LOG
#echo "$mysql_status"
}
function check_mysql_con_results(){
#echo "$max_connections,$Threads_connected"
Residue_conn=$(($max_connections-$Threads_connected))
#echo $Residue_conn
if [ $max_connections -lt 1000 ];then
if [ $Residue_conn -lt 50 ] ;then
code=2
else
code=1
fi
else
code=0
fi
}
if [ $# -le 0 ] || [ "$1" == "-h" ];then
usage
fi
code=0
check_mysql_status $2
check_mysql_con_status $2
. $VAR_LOG
Residue_conn=$max_connections
check_mysql_con_results $2
PER_SECOND_QUESTION=`echo "$Uptime $Queries" | awk '{printf ("%4.3f") ,$2/$1}END{if($2/$1<0.05) exit 0 ;else exit 1;}'`
tmp_code=$?
#
if [ -z $Uptime ];then
echo "$MYSQL $@ Connect Failed,Please check!" && exit 2
fi
#
printf "Uptime:$Uptime Threads_connected:$Threads_connected Max_connections:$max_connections Residue_connectios:$Residue_conn Open_tables:$Open_tables Queries per second avg:%s|Threads=$Threads_running Questions=$Questions Slowqueries=$Slow_queries Opens=$Opened_tables Opentables=$Open_tables Queriespersecondavg=%s" $PER_SECOND_QUESTION $PER_SECOND_QUESTION
#
exit $code

Nagios 的详细介绍：请点这里
Nagios 的下载地址：请点这里

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