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#!/bin/bash
#
# 本脚本用来在指定频率内监控 MySQL 慢日志的变化，并在发生增长时及时报警
# Written by sunsky
# Mail : 274546888@qq.com
# Date : 2014-11-17 10:00:00
#
MON_FILE="$2" # 指定所要监控的脚本路径
SEC=60 # 指定所要监控的频率，即间隔多久去查看一次
MON_POINT_FILE=/tmp/mon_mysql_slow.point # 指定MySQL慢日志的监控点存放的路径
DIFF_MON_FILE=/tmp/mon_mysql_slow.log # 指定在监控频率内增加的MySQL慢日志信息存放路径
ADMIN_MAIL=liuhao@51baturu.com # 指定发送给哪个管理员
function USAGE {
echo -e "\033[31m脚本名称: \033[37m"
echo " $0"
echo -e "\033[31m语法结构: \033[37m"
echo " $0 {start|stop|restart} MySQL慢日志文件路径"
echo -e "\033[31m使用范例: \033[37m"
echo " $0 start /usr/local/mysql/log/mysql_slow.log"
echo " $0 stop"
echo " $0 restart /usr/local/mysql/log/mysql_slow.log"
echo -e "\033[31m注意事项: \033[37m"
echo " 1. 除了stop操作,start和restart操作时,\$2 参数不能为空"
echo " 2. \$2 参数指定的文件必须存在"
exit 2
}
function start {
echo "MySQL慢日志监控进程已经启动,监控文件为 $MON_FILE ,监控频率为 ${SEC}s一次."
while :
do
[ -f $MON_POINT_FILE ] || echo 0 > $MON_POINT_FILE
NEW_POINT=$(awk 'END{print NR}' $MON_FILE)
OLD_POINT=$(<$MON_POINT_FILE)
[[ -z $OLD_POINT ]]&&OLD_POINT=0
SUM_POINT0=$(($NEW_POINT-$OLD_POINT))
SUM_POINT=${SUM_POINT0#-}
tail -$SUM_POINT $MON_FILE > $DIFF_MON_FILE
if [[ -s $DIFF_MON_FILE ]];then
sed -i '1i 本次新增慢日志 '$SUM_POINT' 条' $DIFF_MON_FILE
mail -s "[警告] 服务器 $(hostname) 产生 MySQL 慢日志 $SUM_POINT 条" $ADMIN_MAIL < $DIFF_MON_FILE
> $DIFF_MON_FILE
echo $NEW_POINT > $MON_POINT_FILE
fi
sleep ${SEC}s
done
}
function stop {
if [[ -n `ps -ef|awk '$0~"mon_mysql_slow_log.sh"{print $2}'` ]];
then
for PID in `ps -ef|awk '$0~"mon_mysql_slow_log.sh"{print $2}'`;
do
[[ $PID != $$ ]] && kill -9 $PID >& /dev/null
done
else
echo '目前暂无MySQL慢日志监控进程'
exit 0
fi
echo 'MySQL慢日志监控进程已经停止运行'
}
function restart {
stop
start &
}
if [[ $1 == stop ]]
then
:
else
[[ $2 < 3 ]] && USAGE
[[ ! -f $2 ]] && USAGE
fi
case $1 in
start)
start &
;;
stop)
stop
;;
restart)
MON_FILE=$2
restart
;;
*)
USAGE
;;
esac
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