Shell scripts monitor system load, CPU, and memory usage

#一. Writing script files for system load monitoring
#!/bin/bash

########################################################################
#This scripts is checking the system load,vision 0.1
#Author: Hejunyi
#E-mail:158****[email protected]
########################################################################

#使用uptime命令监控linux系统负载变化

#提取本服务器的IP地址信息
ip= ' Ifconfig eth1 | grep "inet addr" | Cut-f 2-d ":" | Cut-f 1-d "" '

#抓取cpu的总核数
cpu_num= ' grep-c ' model name '/proc/cpuinfo '

#抓取当前系统15分钟的平均负载值
load_15= ' Uptime | awk ' {print $NF} '

#计算当前系统单个核心15分钟的平均负载值, the result is less than 1.0 when the front single digit is 0.
Average_load= ' echo ' scale=2;a= $load _15/$cpu _num;if (Length (a) ==scale (a)) print 0;print a "| BC ' # #scale表示小数精度位数

#取上面平均负载值的个位整数
Average_int= ' echo $average _load | Cut-f 1-d "." `

#设置系统单个核心15分钟的平均负载的告警值为0.70 (i.e. alarm when using more than 70%).
load_warn=0.70

#当单个核心15分钟的平均负载值大于等于1.0 (that is, average_int digits are greater than 0), and two comparisons if less than 1.0
if (($average _int > 0)); Then
echo "$IP server 15min average load reached $average_load, exceeding the alert value of 1.0, please deal with it immediately!"
Else
#当前系统15分钟平均负载值与告警值进行比较 (when greater than set will return 1, less than 0 will be returned)
load_now= ' expr $average _load \> $load _warn '

#如果系统单个核心15分钟的平均负载值大于告警值0.70 (return value is 1), send an email to the administrator
if (($load _now = = 1)); Then
echo "$IP server 15min average load reached $average_load, exceeding the alert value of 0.00, please timely processing"
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Second, monitor the system CPU situation
#!/bin/bash

########################################################################
#This scripts is checking the cpu,vision 0.1
#Author: Hejunyi
#E-mail:158****[email protected]
########################################################################

#提取本服务器的IP地址信息
ip= ' ifconfig eth1|grep "inet addr" |awk ' {print $} ' |cut-f2-d ': "'

#取当前空闲cpu百份比值
Cpu_id= ' top-b-n1|grep "Cpu" |awk ' {print $} ' |cut-f1-d "%" '

#取当前空闲cpu百份比值的整数部分
Cpu_int= ' echo $cpu _id|cut-f1-d. " `

#设置空闲cpu的告警值为20% (that is, less than 20% remaining)
if (($cpu _id < 20)); Then
echo "$IP Server CPU Surplus: $CPU _id%, please handle it in time"
Else
echo "$IP Server CPU Surplus: $CPU _id%"
Fi


Third, monitoring system memory
#!/bin/bash

########################################################################
#This scripts is checking the free_mem,vision 0.1
#Author: Hejunyi
#E-mail:158****[email protected]
########################################################################

#抓取物理内存free值
echo mem-free: ' Free-m | grep Mem | awk ' {print $4} ' M

#抓取缓冲区的free值
echo buffers/cache-free: ' Free-m | grep-| awk ' {print $4} ' M

#抓取Swap分区free值
echo swap-free: ' Free-m | grep Swap | awk ' {print $4} ' M


Iv. monitoring System Exchange Partition swap situation
#!/bin/bash

########################################################################
#This scripts is checking the swap,vision 0.1
#Author: Hejunyi
#E-mail:158****[email protected]
########################################################################

#提取本服务器的IP地址信息
ip= ' Ifconfig eth1 | grep "inet addr" | Cut-f 2-d ":" | Cut-f 1-d "" '

#系统分配的交换分区总量
Swap_total= ' Free-m | grep Swap | awk ' {print $} '

#当前剩余的交换分区free大小
Swap_free= ' Free-m | grep Swap | awk ' {print $4} '

#当前已使用的交换分区used大小
Swap_used= ' Free-m | grep Swap | awk ' {print $} '


#设置交换分区的告警值为20%
swap_warn=0.20

if (($swap _used! = 0)); Then

#如果交换分区已被使用, calculates the percentage of the total of the current remaining swap partition free, in decimal notation, to complement an integer digit before the decimal point 0
Swap_per= ' echo ' scale=2;b= $swap _free/$swap _total;if (length (b) ==scale (b)) print 0;print B "|BC"

#当前剩余交换分区百分比与告警值进行比较 (1 is returned when the value is less than 20%, and 0 is returned if it is less than)
swap_now= ' expr $swap _per \< $swap _warn '

#如果当前交换分区使用即剩余小于20% (The return value above equals 1)
if ($swap _now ==1); then
echo "$IP Server swap partition utilization rate of 80%, only left" $swap _free "M unused, please timely > manager! "
Fi
Fi

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Shell scripts monitor system load, CPU, and memory usage