shell 监控cpu,memory,load average

Posted 2020-07-29

shell 监控cpu，memory，load average，记录到log，当负载压力时，发电邮通知管理员。

实现原理：

1.获取cpu，memory，load average的数值

2.判断数值是否超过自定义的范围，例如（CPU>90%，Memory<10%，load average>2）

3.如数值超过范围，发送电邮通知管理员。发送有时间间隔，每小时只会发送一次。

4.将数值写入log。

5.设置crontab 每30秒运行一次。

#!/bin/bash

# 系统监控,记录cpu、memory、load average,当超过规定数值时发电邮通知管理员

# *** config start ***

# 当前目录路径

ROOT=$(cd "$(dirname "$0")"; pwd)

# 当前服务器名

HOST=$(hostname)

# log 文件路径

CPU_LOG="${ROOT}/logs/cpu.log"

MEM_LOG="${ROOT}/logs/mem.log"

LOAD_LOG="${ROOT}/logs/load.log"

# 通知电邮列表

NOTICE_EMAIL=‘[email protected]‘

# cpu,memory,load average 记录上一次发送通知电邮时间

CPU_REMARK=‘/tmp/servermonitor_cpu.remark‘

MEM_REMARK=‘/tmp/servermonitor_mem.remark‘

LOAD_REMARK=‘/tmp/servermonitor_loadaverage.remark‘

# 发通知电邮间隔时间

REMARK_EXPIRE=3600

NOW=$(date +%s)

# *** config end ***

# *** function start ***

# 获取CPU占用

function GetCpu() {

    cpufree=$(vmstat 1 5 |sed -n ‘3,$p‘ |awk ‘{x = x + $15} END {print x/5}‘ |awk -F. ‘{print $1}‘)

    cpuused=$((100 - $cpufree))

    echo $cpuused

    local remark

    remark=$(GetRemark ${CPU_REMARK})

    # 检查CPU占用是否超过90%

    if [ "$remark" = "" ] && [ "$cpuused" -gt 90 ]; then

        echo "Subject: ${HOST} CPU uses more than 90% $(date +%Y-%m-%d‘ ‘%H:%M:%S)" | sendmail ${NOTICE_EMAIL}

        echo "$(date +%s)" > "$CPU_REMARK"

    fi

}

# 获取内存使用情况

function GetMem() {

    mem=$(free -m | sed -n ‘3,3p‘)

    used=$(echo $mem | awk -F ‘ ‘ ‘{print $3}‘)

    free=$(echo $mem | awk -F ‘ ‘ ‘{print $4}‘)

    total=$(($used + $free))

    limit=$(($total/10))

    echo "${total} ${used} ${free}"

    local remark

    remark=$(GetRemark ${MEM_REMARK})

    # 检查内存占用是否超过90%

    if [ "$remark" = "" ] && [ "$limit" -gt "$free" ]; then

        echo "Subject: ${HOST} Memory uses more than 90% $(date +%Y-%m-%d‘ ‘%H:%M:%S)" | sendmail ${NOTICE_EMAIL}

        echo "$(date +%s)" > "$MEM_REMARK"

    fi

}

# 获取load average

function GetLoad() {

    load=$(uptime | awk -F ‘load average: ‘ ‘{print $2}‘)

    m1=$(echo $load | awk -F ‘, ‘ ‘{print $1}‘)

    m5=$(echo $load | awk -F ‘, ‘ ‘{print $2}‘)

    m15=$(echo $load | awk -F ‘, ‘ ‘{print $3}‘)

    echo "${m1} ${m5} ${m15}"

    m1u=$(echo $m1 | awk -F ‘.‘ ‘{print $1}‘)

    local remark

    remark=$(GetRemark ${LOAD_REMARK})

    # 检查是否负载是否有压力

    if [ "$remark" = "" ] && [ "$m1u" -gt "2" ]; then

        echo "Subject: ${HOST} Load Average more than 2 $(date +%Y-%m-%d‘ ‘%H:%M:%S)" | sendmail ${NOTICE_EMAIL}

        echo "$(date +%s)" > "$LOAD_REMARK"

    fi

}

# 获取上一次发送电邮时间

function GetRemark() {

    local remark

    if [ -f "$1" ] && [ -s "$1" ]; then

        remark=$(cat $1)

        if [ $(( $NOW - $remark )) -gt "$REMARK_EXPIRE" ]; then

            rm -f $1

            remark=""

        fi

    else

        remark=""

    fi

    echo $remark

}

# *** function end ***

cpuinfo=$(GetCpu)

meminfo=$(GetMem)

loadinfo=$(GetLoad)

echo "cpu: ${cpuinfo}" >> "${CPU_LOG}"

echo "mem: ${meminfo}" >> "${MEM_LOG}"

echo "load: ${loadinfo}" >> "${LOAD_LOG}"

exit 0

本文出自 “Andylinux” 博客，请务必保留此出处http://andywen.blog.51cto.com/10283904/1792538