主从监控插件编写：

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#!/bin/bash
MySQL="/usr/local/mysql/bin/mysql -uslave -pslave12345 -h227.0.0.1 -P"
VAR_LOG=/tmp/check_mysql_status.log.$2 && >$VAR_LOG
function usage(){
    cat <> $VAR_LOG
    #echo "$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 -h227.0.0.1 -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 <> $VAR_LOG
        #echo "$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

本文题目：自己编写Nagios监控Mysql插件
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