Linux 系统监控shell脚本

比较粗略的一个脚本：主要监控系统磁盘、CPU、内存、网络流量、tcp连接数等

代码如下：

[root@test system_monitor_shell_script]# cat system_monitor.sh
#!/bin/bash
#. /home/hduser/modify_system_variable.sh
. /data/script_ssh/system_monitor_shell_script/modify_system_variable.sh
#1、系统基本信息
################################################################
echo -e "33[32m############# 系统时间 #############33[0m"
echo System_Now_Time: `date "+%Y-%m-%d %H:%M:%S"`
#获取系统时间也可以使用who -b
echo System_Boot_Time: `date -d "$(awk -F. '{print $1}' /proc/uptime) second ago" +"%Y-%m-%d %H:%M:%S"`
echo -e "33[32m############ 主机名 ###############33[0m"
echo  Hostname: `hostname`





echo -e "33[32m########## Ip地址和网卡流量 ##########33[0m"
#获取服务器的网卡和IP地址，以便在网卡流量监控时使用。



for Network in `ifconfig |awk -F : '/^[[:alpha:]]/{print $1}'`
do
  FLOWA=/tmp/.$Network
  grep $Network: /proc/net/dev|awk -F: '{print $2}'|awk '{print "INPUT "  $1 " "  "OUTPUT " $9}' > $FLOWA
  #第一次获取网卡流量，单位字节
  INPUTA=`awk '{print $2}' $FLOWA`
  OUTPUTA=`awk '{print $4}' $FLOWA`
  #获取网卡流量间隔时间
  sleep $NETTIME
  #第二次获取网卡流量，单位字节
  grep $Network: /proc/net/dev|awk -F: '{print $2}'|awk '{print "INPUT "  $1 " "  "OUTPUT " $9}' > $FLOWA
  INPUTB=`awk '{print $2}' $FLOWA`
  OUTPUTB=`awk '{print $4}' $FLOWA`
  #计算
  #转换网卡流量单位为KB
  INPUTC=`echo -e "$INPUTB-$INPUTA" | bc`
  OUTPUTC=`echo -e "$OUTPUTB-$OUTPUTA"| bc`
  INPUTMBA=`echo -e $INPUTC |awk '{printf "%0.3f
",$1/1024}'`
  OUTPUTMBA=`echo -e $OUTPUTC |awk '{printf "%0.3f
",$1/1024}'`
  INPUT=`echo -e $INPUTC |awk '{printf "%0.3f
",$1/1024/1024}'`
  OUTPUT=`echo -e $OUTPUTB |awk '{printf "%0.3f
",$1/1024/1204}'`
  #判断网卡流量使用量
  if [ $INPUTC -le 1048576 ];then
        if [ $OUTPUTC -le 1048576 ];then
            echo  Network_Card: $Network    Ip: `/sbin/ifconfig $Network|grep "inet "|awk '{print $2}'`  "输入流量: " ${INPUTMBA}K/S  "输出流量: " "${OUTPUTMBA}K/S "
        else
            echo  Network_Card: $Network    Ip: `/sbin/ifconfig $Network|grep "inet "|awk '{print $2}'`  "输入流量: " ${INPUTMBA}K/S  "输出流量: " "${OUTPUT}M/S "
        fi
    elif [ $INPUTC -gt 1048576 ];then
        if [ $OUTPUTC -gt 1048576 ];then
            echo  Network_Card: $Network    Ip: `/sbin/ifconfig $Network|grep "inet "|awk '{print $2}'`  "输入流量: " ${INPUT}M/S "输出流量: " "${OUTPUTMBA}K/S "
        else
            echo  Network_Card: $Network    Ip: `/sbin/ifconfig $Network|grep "inet "|awk '{print $2}'`  "输入流量: " ${INPUT}M/S "输出流量:" "${OUTPUT}M/S "
        fi
    fi
done

#2、CPU监控
##############################################################
echo -e "33[32m############### CPU平均负载和系统进程数 ##############33[0m"
#us(user time)：用户进程执行消耗cpu时间；sy(system time)：系统进程执行消耗cpu时间；id：空闲时间（包括IO等待时间）；wa：等待IO时间。
#CPULIMIT=90
CPU_us=$(vmstat | awk '{print $13}' | sed -n '$p')
CPU_sy=$(vmstat | awk '{print $14}' | sed -n '$p')
CPU_id=$(vmstat | awk '{print $15}' | sed -n '$p')
CPU_wa=$(vmstat | awk '{print $16}' | sed -n '$p')
CPU_st=$(vmstat | awk '{print $17}' | sed -n '$p')
#计算服务器CPU使用率
CPU1=`cat /proc/stat | grep 'cpu ' | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}'`
sleep $CPUTIME
CPU2=`cat /proc/stat | grep 'cpu ' | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}'`
IDLE1=`echo -e $CPU1 | awk '{print $4}'`
IDLE2=`echo -e $CPU2 | awk '{print $4}'`
CPU1_TOTAL=`echo -e $CPU1 | awk '{print $1+$2+$3+$4+$5+$6+$7}'`
CPU2_TOTAL=`echo -e $CPU2 | awk '{print $1+$2+$3+$4+$5+$6+$7}'`
IDLE=`echo -e "$IDLE2-$IDLE1" | bc`
CPU_TOTAL=`echo -e "$CPU2_TOTAL-$CPU1_TOTAL" | bc`
RATE=`echo -e "scale=4;($CPU_TOTAL-$IDLE)/$CPU_TOTAL*100" | bc | awk '{printf "%.2f",$1}'`

echo "用户进程占用CPU时间: us=$CPU_us" ; echo "系统进程消耗CPU时间: sy=$CPU_sy";
echo "CPU空闲时间:         id=$CPU_id" ; echo "等待I/O时间:         wa=$CPU_wa";
echo "CPU使用率:           ${RATE}%"
CPU_RATE=`echo -e $RATE | cut -d. -f1`
load_average=$(uptime |gawk -F':' '{print $NF}')
running_process=$(top -b -d 1 -n 1 |sed -n '2p' |awk -F',' '{print $2}' |awk '{print $1}')
#running_process=`ps aux |wc -l`
total_process=$(ps -ef |wc -l)
echo  
echo  "CPU_load_average: ${load_average}"
echo  "running_process:""    " ${running_process}
echo  "total_process:""      " ${total_process}

Host_running_time=$(uptime |sed 's/^.*up//' | awk -F "," '{print $1}')
User_connection_number=$(uptime |cut -d , -f 3|awk '{print $1}')
#cat /proc/uptime| awk -F. '{run_days=$1 / 86400;run_hour=($1 % 86400)/3600;run_minute=($1 % 3600)/60;run_second=$1 % 60;printf("系统已运行：%d天%d时%d分%d秒
",run_days,run_hour,run_minute,run_second)}'
echo -e   "Host_running_time:    `cat /proc/uptime| awk -F. '{run_days=$1 / 86400;run_hour=($1 % 86400)/3600;run_minute=($1 % 3600)/60;run_second=$1 % 60;printf("%d天%d时%d分%d秒
",run_days,run_hour,run_minute,run_second)}'`"
echo -e   "User_connection_number:    ${User_connection_number}
" 
#CPU占用最多的十个进程
CPUA=`expr $RATE > $CPULIMIT`
if [ $CPUA -eq 1  ];then
   echo "$time1 CPU警告:当前CPU使用率$RATE%,大于$CPULIMIT%"; echo  ;
   echo "process使用CPU情况:"
   ps aux |sort -k3nr |head |awk 'BEGIN{printf "%-10s%-10s%-10s%-10s
","USER","PID","%CPU","COMMAND"}{printf "%-10s%-10d%-10.1f%-10s
",$1,$2,$3,$11}'
fi
echo

#3、内存监控
####################################################################
echo -e "33[32m########### 系统内存使用情况 ##############33[0m" 
#内存使用情况
#MEMLIMIT=80
Total_Mem=$(free -m |sed -n '2p' |awk '{print $2}')
Usage_Mem=$(free -m |sed -n '2p' |awk '{print $3}')
Free_Mem=$(free -m |sed -n '2p' |awk '{print $4}')
Mem_Usage_Percent=`free -m |sed -n '2p'|awk '{printf "%-1d",$3/$2*100}'`
#交换分区使用情况
Swap_Total_Mem=$(free -m |grep Swap |sed -n 'p' |awk '{print $2}')
Swap_Usage_Mem=$(free -m |grep Swap |sed -n 'p' |awk '{print $3}')
Swap_Free_Mem=$(free -m |grep Swap |sed -n 'p' |awk '{print $4}')
Swap_Mem_Usage_Percent=`free -m |grep Swap|sed -n 'p'|awk '{printf "%-1d",$3/$2*100}'`
echo "总内存:"${Total_Mem}M
echo "使用内存: ${Usage_Mem}M"; echo "剩余内存: ${Free_Mem}M"
echo -e "内存使用率: ${Mem_Usage_Percent}%
" 
echo "交换分区使用情况:"
echo "总内存: ${Swap_Total_Mem}M" ;echo "使用内存: ${Swap_Usage_Mem}M"
echo "剩余内存: ${Swap_Free_Mem}M";echo -e "使用率: ${Swap_Mem_Usage_Percent}%
"
#判断内存使用是否超过80%
MA=`expr $Mem_Usage_Percent > $MEMLIMIT`
if [ $MA -eq 1 ];then
    echo "$time1 内存警告,当前内存使用$Mem_Usage_Percent% 大于$MEMLIMIT%"
fi

MB=`expr $Swap_Mem_Usage_Percent > $MEMLIMIT`
if [ $MB -eq 1 ];then
   echo "$time1 内存警告,当前内存$Swap_Mem_Usage_Percent% 大于$MEMLIMIT%"
fi
echo "process使用内存情况:"
ps aux |sort -k4nr |head |awk 'BEGIN{printf "%-10s%-10s%-10s%-10s
","USER","PID","%MEM","COMMAND"}{printf "%-10s%-10d%-10.1f%-10s
",$1,$2,$4,$11}'
#PCPID=`ps aux |sort -k4nr |head |awk 'BEGIN{printf "%-10s%-10s%-10s%-10s
","USER","PID","%MEM","COMMAND"}{printf "%-10s%-10d%-10.1f%-10s
",$1,$2,$4,$11}' |grep -v -i user |awk '{print $2}'`
#PDMEM=`ps aux |sort -k4nr |head |awk 'BEGIN{printf "%-10s%-10s%-10s%-10s
","USER","PID","%MEM","COMMAND"}{printf "%-10s%-10d%-10.1f%-10s
",$1,$2,$4,$11}' |grep -v -i user |awk '{print $3}'`
#for i in $PCPID
#do
#    echo $i;ps -ef |grep $i |awk '{print $NF}' |head -1
#done
echo 
#4、磁盘监控
#################################################################
#ROOT=80
#VAR=90
#HOME=90
#BOOT=80
#DATA=90
NULL=/dev/null
echo -e "33[32m############### 磁盘使用情况 ################33[0m"
disk=/tmp/.disk
#parted适用于Ubuntu
#parted -l |grep -i 'disk' |grep '/dev/[a-z]d[a-z]' |awk -F: '{print $1}' |awk '{print $2}' > /tmp/.disknumber
#/sbin/fdisk -l |grep -i 'disk' |grep '/dev/[a-z]d[a-z]' |awk -F: '{print $1}' |awk '{print $2}' > /tmp/.disknumber
   disk_data_usage=`df -h  |grep  "data$"  |awk '{print $5}'|awk -F% '{print $1}'`
   disk_root_usage=`df -h  |grep  "/$"    |awk '{print $5}'|awk -F% '{print $1}'`
   disk_home_usage=`df -h  |grep  "home$"    |awk '{print $5}'|awk -F% '{print $1}'`
   disk_var_usage=`df -h   |grep  "var"   |awk '{print $5}'|awk -F% '{print $1}'`
   disk_boot_usage=`df -h  |grep  "boot"  |awk '{print $5}'|awk -F% '{print $1}'`
   disk_data2_usage=`df -h |grep  "data2" |awk '{print $5}'|awk -F% '{print $1}'`
   disk_data3_usage=`df -h |grep  "data3" |awk '{print $5}'|awk -F% '{print $1}'`
   disk_data4_usage=`df -h |grep  "data4" |awk '{print $5}'|awk -F% '{print $1}'`
   disk_data5_usage=`df -h |grep  "data5" |awk '{print $5}'|awk -F% '{print $1}'`
#获取磁盘分区使用情况
df -h |awk '{print $NF}' > /tmp/.disk
grep home $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_home_usage -ge $HOME ];then
       echo "    "/home分区警告:当前使用$disk_home_usage%，大于$HOME
    else
       echo "    "当前/home分区使用:"         "$disk_home_usage%
    fi
fi
grep  "/$" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_root_usage -ge $ROOT ];then
       echo "    "/分区警告:当前使用$disk_root_usage%，大于$ROOT
    else
       echo "    "当前/分区使用:"         "$disk_root_usage%
    fi

fi
grep  "var" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_var_usage -ge $VAR ];then
       echo "    "/var分区警告:当前使用$disk_var_usage%，大于$VAR
    else
       echo "    "当前/var分区使用:"         "$disk_var_usage%
    fi

fi
grep  "boot" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_boot_usage -ge $BOOT ];then
       echo "    "/boot分区警告:当前使用$disk_boot_usage%，大于$BOOT
    else
       echo "    "当前/boot分区使用:"         "$disk_boot_usage%
    fi
fi
grep  "data" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_data_usage -ge $DATA ];then
       echo "    "/data分区警告:当前使用$disk_data_usage%，大于$DATA
    else
       echo "    "当前/data分区使用:"         "$disk_data_usage%
    fi
fi
grep  "data2" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_data2_usage -ge $DATA ];then
       echo "    "/data2分区警告:当前使用$disk_data2_usage%，大于$DATA
    else
       echo "    "当前/data2分区使用:"         "$disk_data2_usage%
    fi
fi
grep  "data3" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_data3_usage -ge $DATA ];then
       echo "    "/data3分区警告:当前使用$disk_data3_usage%，大于$DATA
    else
       echo "    "当前/data3分区使用:"         "$disk_data3_usage%
    fi
fi
grep  "data4" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_data4_usage -ge $DATA ];then
       echo "    "/data4分区警告:当前使用$disk_data4_usage%，大于$DATA
    else
       echo "    "当前/data4分区使用:"         "$disk_data4_usage%
    fi
fi
grep  "data5" $disk > $NULL
if [ $? -eq 0 ];then
    if [ $disk_data5_usage -ge $DATA ];then
       echo "    "/data5分区警告:当前使用$disk_data5_usage%，大于$DATA
    else
       echo "    "当前/data5分区使用:"         "$disk_data5_usage%
    fi
fi
echo



#5、连接数
######################################################################
tcpfile=/tmp/.tcp
#查看并发连接数
#描述
#CLOSED：无连接是活动的或正在进行 
#LISTEN：服务器在等待进入呼叫 
#SYN_RECV：一个连接请求已经到达，等待确认 
#SYN_SENT：应用已经开始，打开一个连接 
#ESTABLISHED：正常数据传输状态 
#FIN_WAIT1：应用说它已经完成 
#FIN_WAIT2：另一边已同意释放 
#ITMED_WAIT：等待所有分组死掉 
#CLOSING：两边同时尝试关闭 
#TIME_WAIT：另一边已初始化一个释放 
#LAST_ACK：等待所有分组死掉
netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}' > $tcpfile
grep TIME_WAIT $tcpfile > $NULL
if [ $? -eq 1 ] ; then
echo "TIME_WAIT 0 " >> $tcpfile
fi
grep FIN_WAIT1 $tcpfile > $NULL
if [ $? -eq 1 ] ; then
echo "FIN_WAIT1 0 " >> $tcpfile
fi
grep FIN_WAIT2 $tcpfile  > $NULL
if [ $? -eq 1 ] ; then
echo "FIN_WAIT2 0 " >> $tcpfile
fi
grep CLOSE_WAIT $tcpfile  > $NULL
if [ $? -eq 1 ] ; then
echo "CLOSE_WAIT 0 " >> $tcpfile
fi
grep LAST_ACK $tcpfile  > $NULL
if [ $? -eq 1 ] ; then
echo "LAST_ACK 0 " >> $tcpfile
fi
grep SYN_RECV $tcpfile  > $NULL
if [ $? -eq 1 ] ; then
echo "SYN_RECV 0 " >> $tcpfile
fi
grep CLOSING $tcpfile  > $NULL
if [ $? -eq 1 ] ; then
echo "CLOSING 0 " >> $tcpfile
fi
grep ESTABLISHED $tcpfile  > $NULL
if [ $? -eq 1 ] ; then
echo "ESTABLISHED 0 " >> $tcpfile
fi

TIME_WAITV=`grep TIME_WAIT $tcpfile | awk '{print $2}'`
FIN_WAIT1V=`grep FIN_WAIT1 $tcpfile | awk '{print $2}'`
FIN_WAIT2V=`grep FIN_WAIT2 $tcpfile | awk '{print $2}'`
ESTABLISHEDV=`grep ESTABLISHED $tcpfile | awk '{print $2}'`
SYN_RECVV=`grep SYN_RECV $tcpfile | awk '{print $2}'`
CLOSINGV=`grep CLOSING $tcpfile | awk '{print $2}'`
CLOSE_WAITV=`grep CLOSE_WAIT $tcpfile | awk '{print $2}'`
LAST_ACKV=`grep LAST_ACK $tcpfile | awk '{print $2}'`
echo -e "33[32m###########Tcp连接数##################33[0m"
echo "    "当前TIME_WAIT"  " 连接数为 $TIME_WAITV 个。
echo "    "当前FIN_WAIT1"  " 连接数为 $FIN_WAIT1V 个。
echo "    "当前FIN_WAIT2"  " 连接数为 $FIN_WAIT2V 个。
echo "    "当前CLOSE_WAIT" " 连接数为 $CLOSE_WAITV 个。
echo "    "当前ESTABLISHED"" 连接数为 $ESTABLISHEDV 个。
echo "    "当前SYN_RECV"   " 连接数为 $SYN_RECVV 个。
echo "    "当前LAST_ACKV"  " 连接数为 $LAST_ACKV 个。
echo "    "当前CLOSING"    " 连接数为 $CLOSINGV 个。; echo  ;
echo -e "33[31m ----------------------------END--------------------------33[0m"

modify_system_variable.sh文件如下

#!/bin/bash
#计算CPU利用率的时间间隔。
CPUTIME=2     # 单位 s
#CPU限制，当系统使用CPU达到下面值时报警。
CPULIMIT=90 #单位 %
#内存限制，当系统使用内存达到下面值时报警。
MEMLIMIT=80   #单位 %
#磁盘监控。

ROOT=80       # / 分区使用限制。单位 %
VAR=90        # var 分区使用限制。 单位 %
HOME=90        # home 分区使用限制。单位 %
BOOT=80       # boot 分区使用限制。 单位 %
DATA=90       # data1 分区使用限制。单位 %
#计算网卡流量时间间隔
NETTIME=3     #单位 s