监测系统的情况,你必须知道的两三事!

时间:2022-11-17 18:13:35

       你要是系统运维人员,就要实时的监控系统的一些重要参数,不如僵尸进程,CPU的利用率,内存的使用情况,磁盘空间的使用情况,系统的均衡负载,根据得到的最新信息,我们就能判断系统运行的状态是否良好。本人接触linux系统也有一点时间,在网上看看了,经过整理,将一些常用的系统监控的命令shell脚本拿出来晒,希望给新手提供学习的机会,同时也希望经验丰富者提够些技术知道,多多探讨交流!

获得某个用户的某个进行的信息:

function GetPID #user #name
{
	PsUser=$1
	#echo $PsUser
	PsName=$2
	#echo $PsName
	pid=`ps -u $PsUser | grep $PsName | grep -v grep | grep -v vi | grep -v dbx\n | grep -v tail | grep -v start | grep -v stop | sed -n 1p | awk '{print $1}'`
	echo $pid
}

PID=`GetPID lgy cat`
echo $PID

#The process does not exist.

if [ "-$PID" == "-" ]
then
{
    echo "The process does not exist."
}
fi
       这里面 涉及一些最基本的进程监控命令,在linux中你只要man ps就会得到很多使用说明,grep按照一定的匹配规则进行字符串分割匹配,还有一些简单的控制语句,这些基本的shell语法应该是我们的基本技能,在晚上会有很多的学习资料。

获得CPU的使用率:

function GetCPU
{
    CPUValue=`ps -p $1 -o pcpu | grep -v CPU | awk '{print $1}' | awk -F. '{print $1}'`
    echo $CPUValue
}

function CheckCPU
{
    PID=$1
    cpu=`GetCPU $PID`
    if [ $cpu -gt 80 ]
    then
    {
        echo "The usage of cpu is larger than 80%"
    }
    else
    {
        echo "The usage of cpu is normal"
    }
    fi
}

CheckCPU $PID

        这个 程序和上一个代码片段是一脉相承,本段代码的运行结果一会会有相应的展示!

这段脚本的主要目的是用来进行某个进程的内存使用情况的检测:

function GetMem
{
    MemUsage=`ps -o vsz -p $1 | grep -v VSZ`
    ((MemUsage /= 1024))
    echo $MemUsage    
}

mem=`GetMem $PID`
if [ $mem -gt 1600 ]
then
{
    echo "The usage of memory is larger than 1.6G"
}
else
{
    echo "The usage of memory is normal"
}
fi

这是用来进行获得此进程的句柄使用量:

function GetDes
{
    DES=`ls /proc/$1/fd | wc -l`
    echo $DES
}

des=`GetDes $PID`
if [ $des -gt 900 ]
then
{
    echo "The number of des is larger than 900"
}
else
{
    echo "The number of des is normal"
}
fi

进行 对某个端口的绑定的查询:

function Listening
{
    TCPListeningNum=`netstat -an | grep ":$1 " | awk '$1 == "tcp" && $NF == "LISTEN" {print $0}' | wc -l`
    UDPListenNum=`netstat -an | grep ":$1 " | awk '$1 == "udp" && $NF == "0.0.0.0:*" {print $0}' | wc -l`
    ((ListeningNum = TCPListeningNum + UDPListenNum ))
    if [ $ListeningNum == 0 ]
    then
    {
        echo "0"
    }
    else
    {
        echo "1"
    }
    fi
}

isListen=`Listening 8080`
if [ $isListen -eq 1 ]
then
{
    echo "The port is listening"
}
else
{
    echo "The port is not listening"
}
fi

系统CPU 的使用情况:

function GetSysCPU
{
    CPUIdle=`vmstat 1 5 | sed -n '3,$p' | awk '{x = x + $15} END {print x/5}' | awk -F. '{print $1}'`
    CPUNum=`echo "100-$CPUIdle" | bc`
    echo $CPUNum
}

cpu=`GetSysCPU`
echo "The System CPU is $cpu"
if [ $cpu -gt 90 ]
then
{
    echo "The usage of system cpu is larger than 90%"
}
else
{
    echo "The usage of system cpu is normal"
}
fi

获得某 制定的磁盘空间

function GetDiskSpc
{
    if [ $# -ne 1 ]
    then
        return 1
    fi
    
    Folder="$1$"
    DiskSpace=`df -k | grep $Folder | awk '{print $5}' | awk -F% '{print $1}'`
    echo $DiskSpace
}

Folder="/dev"
DiskSpace=`GetDiskSpc $Folder`
echo "The system $Folder disk space is $DiskSpace%"
if [ $DiskSpace -gt 90 ]
then
{
    echo "The usage of system disk($Folder) is larger than 90%"
}
else
{
    echo "The usage of system disk($Folder) is normal"
}
fi

在本机上代码检测的结果 如下:

lgy@lgy-HP:~$ ./monitorCPU.sh 
2388
The usage of cpu is normal
The usage of memory is normal
The number of des is normal
The port is not listening
The System CPU is 1
The usage of system cpu is normal
The system /dev disk space is 1%
The usage of system disk(/dev) is normal