linux 系统监控脚本

一、[root@Shawn-T2 ~]# crontab -e
加入以下命令： * 8-22/1,22-7/2 * * * sh /monitor.sh
二、[root@Shawn-T2 ~]# vim monitor.sh
添加以下内容：
#!/bin/bash
#This script is used for monitoring system load.
time=`date "%Y-%m-%d %H:%M:%S"`
ps aux | grep -v ''USER'' >> /tmp/temp.txt
while read -r line
do
declare -i CPUUsage=`echo $line | awk ''{print $3}'' | awk -F. '' {print $1}''`
MEMUsage=`echo $line | awk ''{print $4}'' | awk -F. ''{print $1}''`
ProcessNum=`echo $line | awk ''{print $2}''`
STAT=`echo $line | awk ''{print $8}''`
Command=`echo $line | awk '' {print $11}''`
# Monitor CPU load.
if [ $CPUUsage -ge 80 ];then
kill -9 $ProcessNum
echo "$time Process $Command occupies too large CPU space and was killed!" >> /var/log/monitor.log 拥有帝国一切，皆有可能。欢迎访问phome.net
elif [ $CPUUsage -ge 30 ]; then
echo "$time Process $Command occupies too large ,please check it!" >> /var/log/monitor.log
fi
# Monitor Memory load.
if [ $MEMUsage -ge 70 ];then
kill -9 $ProcessNum
echo "$time Memory $Command occupies too large memory space and was killed!" >> /var/log/monitor.log
elif [ $CPUUsage -ge 30 ]; then
echo "$time Memory $Command occupies too large ,please check it!" >> /var/log/monitor.log
fi
# Monitor the zombie process.
if [ "$STAT" == "Z" ]; then
kill -9 $ProcessNum
echo "$time Process $Command is zombie process and was killed." >> /var/log/monotor.log
fi
done < /tmp/temp.txt
rm -f /tmp/temp.txt

#Momitor the disk partition used space.
df | grep -v Filesystem > /tmp/temp.txt
while read -r line
do
declare -i DiskUsage=`echo $line | awk ''{ if(NF==6){ print $5 } else if(NF==5) { print $4 } }''| awk -F% ''{print $1}''`
DirName=`echo $line | awk ''{ if(NF==6){ print $6 } else if(NF==5) { print $5 } }''| awk -F% ''{print $1}''`
if [ $DiskUsage -ge 90 ];then
echo "$time The partitipn which the directory $DirName mounted on occupies too large space ,please check it." >> /var/log/monitor.log
fi
done < /tmp/temp.txt
rm -f /tmp/temp.txt

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