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服务器自动监控Shell脚本

发布时间：2014-10-24 22:48:14编辑：songlin阅读（102）

一、使用方法：

git clone git://gist.github.com/1216837.git gist-1216837

vim gist-1216837/sys-mon.sh //修改内存、CPU等预设阀值

mkdir /var/script

mv gist-1216837/sys-mon.sh /var/script

设置每分钟执行一次

crontab -e

* * * * * /bin/bash /var/shell/sys-mon.sh

二、Shell脚本内容

#! /bin/bash

#====================================================================

# sys-mon.sh

#

# Copyright (c) 2011, WangYan

# All rights reserved.

# Distributed under the GNU General Public License, version 3.0.

#

# Monitor system mem and load, if too high, restart some service.

#

# See: http://wangyan.org/blog/sys-mon-shell-script.html

#

# V 0.5, Date: 2011-12-08

#====================================================================

# Need to monitor the service name

# Must be in /etc/init.d folder exists

NAME_LIST="httpd nginx mysql"

# Single process to allow the maximum CPU (%)

PID_CPU_MAX="25"

# The maximum allowed memory (%)

PID_MEM_SUM_MAX="95"

# The maximum allowed system load

SYS_LOAD_MAX="6"

# Log path settings

LOG_PATH="/var/log/sys-mon.log"

# Date time format setting

DATA_TIME=$(date +"%y-%m-%d %H:%M:%S")

# Your email address

EMAIL="webmaster@example.com"

# Your website url

MY_URL="http://106.187.38.210/p.php"

#====================================================================

for NAME in $NAME_LIST

do

    PID_CPU_SUM="0";PID_MEM_SUM="0"

    PID_LIST=`ps aux | grep $NAME | grep -v root`

    IFS_TMP="$IFS";IFS=$'\n'

    for PID in $PID_LIST

    do

        PID_NUM=`echo $PID | awk '{print $2}'`

        PID_CPU=`echo $PID | awk '{print $3}'`

        PID_MEM=`echo $PID | awk '{print $4}'`

#       echo "$NAME: PID_NUM($PID_NUM) PID_CPU($PID_CPU) PID_MEM($PID_MEM)"

        PID_CPU_SUM=`echo "$PID_CPU_SUM + $PID_CPU" | bc`

        PID_MEM_SUM=`echo "$PID_MEM_SUM + $PID_MEM" | bc`

        if [ `echo "$PID_CPU >= $PID_CPU_MAX" | bc` -eq 1 ];then

            if [[ "$NAME" = "php-fpm" || "$NAME" = "httpd" ]];then

                sleep 5

                if [ `echo "$PID_CPU >= $PID_CPU_MAX" | bc` -eq 1 ];then

                    echo "${DATA_TIME}: kill ${NAME}($PID_NUM) successful (CPU:$PID_CPU)" | tee -a $LOG_PATH

                    kill $PID_NUM

                fi

            else

                echo "${DATA_TIME}: [WARNING!] ${NAME}($PID_NUM) cpu usage is too high! (CPU:$PID_CPU)" | tee -a $LOG_PATH

            fi

        fi

    done

    IFS="$IFS_TMP"

    SYS_LOAD=`uptime | awk '{print $(NF-2)}' | sed 's/,//'`

    SYS_MON="CPU:$PID_CPU_SUM MEM:$PID_MEM_SUM LOAD:$SYS_LOAD"

#   echo -e "$NAME: $SYS_MON\n"

    SYS_LOAD_TOO_HIGH=`awk 'BEGIN{print('$SYS_LOAD'>'$SYS_LOAD_MAX')}'`

    PID_MEM_SUM_TOO_HIGH=`awk 'BEGIN{print('$PID_MEM_SUM'>'$PID_MEM_SUM_MAX')}'`

    if [[ "$SYS_LOAD_TOO_HIGH" = "1" || "$PID_MEM_SUM_TOO_HIGH" = "1" ]];then

        /etc/init.d/$NAME stop

        sleep 5

        for ((i=1;i<4;i++))

        do

            if [ `pgrep $NAME | wc -l` = "0" ];then

                echo "$DATA_TIME: Stop $NAME successful! ($SYS_MON)" | tee -a $LOG_PATH

                break

            else

                echo "${DATA_TIME}: [WARNING!] Stop $NAME failed[$i]! ($SYS_MON)" | tee -a $LOG_PATH

                pkill $NAME && killall $NAME

            fi

        done

        /etc/init.d/$NAME start

        sleep 5

        for ((ii=1;ii<4;ii++))

        do

            if [ `pgrep $NAME | wc -l` != "0" ];then

                echo "$DATA_TIME: Start $NAME successful!" | tee -a $LOG_PATH

                break

            else

                echo "${DATA_TIME}: [WARNING!] Start $NAME failed[$ii]! ($SYS_MON)" | tee -a $LOG_PATH

                /etc/init.d/$NAME start

                sleep 5

            fi

        done

        if [ `pgrep $NAME | wc -l` != "0" ];then

            echo "${DATA_TIME}: [ERROR!] Start $NAME failed! ($SYS_MON)" | mail -s "Start $NAME failed" $EMAIL

        fi

    fi

done

STATUS_CODE=`curl -o /dev/null -s -w %{http_code} $MY_URL`

#echo -e "STATUS CODE: $STATUS_CODE\n"

if [ "$STATUS_CODE" != "200" ];then

    sleep 3

    STATUS_CODE=`curl -o /dev/null -s -w %{http_code} $MY_URL`

    if [ "$STATUS_CODE" != "200" ];then

        echo "${DATA_TIME}: [WARNING!] Website Downtime! ($SYS_MON)" | tee -a $LOG_PATH

        echo "${DATA_TIME}: [WARNING!] Website Downtime! ($SYS_MON)" | mail -s "Start $NAME failed" $EMAIL

    fi

fi

脚本内容不难理解，原理解释可参考《Linux 进程自动监控shell脚本》

三、注意事项

1、NAME_LIST 指定的监控程序必须在/etc/init.d 文件夹中存在，并且支持stop和start操作

2、PID_CPU_MAX 指的是单个进程的CPU占用，只针对php-fpm或httpd。

3、PID_MEM_SUM_MAX 指的是该程序所有进程实际内存占用，而并非系统总内存。

4、EMAIL 只有在程序启动失败后，你才能收到邮件提醒。

四、调试（补充，以上为WangYan Blog 原文章）

脚本写完之后让我们运行一下，当然脚本里面的EMail 和 weburl还是需要改成你自己的，结果：

./xxx.sh # xxx为自命名

./pid_auto_reboot.sh: line 57: bc: command not found

./pid_auto_reboot.sh: line 59: bc: command not found

./pid_auto_reboot.sh: line 59: [: -eq: unary operator expected

./pid_auto_reboot.sh: line 56: bc: command not found

./pid_auto_reboot.sh: line 57: bc: command not found

./pid_auto_reboot.sh: line 59: bc: command not found

./pid_auto_reboot.sh: line 59: [: -eq: unary operator expected

./pid_auto_reboot.sh: line 56: bc: command not found

./pid_auto_reboot.sh: line 57: bc: command not found

./pid_auto_reboot.sh: line 59: bc: command not found

./pid_auto_reboot.sh: line 59: [: -eq: unary operator expected

./pid_auto_reboot.sh: line 56: bc: command not found

./pid_auto_reboot.sh: line 57: bc: command not found

./pid_auto_reboot.sh: line 59: bc: command not found

./pid_auto_reboot.sh: line 59: [: -eq: unary operator expected

awk: BEGIN{print(>95)}

awk: ^ syntax error

awk: BEGIN{print(>95)}

awk: ^ syntax error

./pid_auto_reboot.sh: line 56: bc: command not found

./pid_auto_reboot.sh: line 57: bc: command not found

./pid_auto_reboot.sh: line 59: bc: command not found

./pid_auto_reboot.sh: line 59: [: -eq: unary operator expected

什么问题？哦原来是没有bc命令没关系，没有我们就安装一下嘛，我用的是CentOs 直接

yum -y install bc

安装一下。再运行搞定。

本文来源地址：http://wangyan.org/blog/sys-mon-shell-script.html

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