Linux shell 脚本监控cpu，内存，硬盘，网络，是否存活
#!/bin/sh# 脚本放入到/usr/local/bin
# chmod 755 check_server.sh
# crontab 中添加
source /etc/bashrc
#------监控阈值
DISK_space_warn=90
CPU_load_warn=5
CPU_use_warn=50
MEM_use_warn=95
#SWAP_use_warn=50
Net_SYN_count_warn=200
#判断参数
if [ $# -ne 2 ]; then
hint_msg="usage: $0 Monitoring_type,Monitoring_type phone,phone,phone"
echo $hint_msg
echo "sh $0 disk,cpu,mem,net,io,alive"
exit -1
fi
#------监控项
Monitoring_type_tmp=$1
Monitoring_type=$(echo $Monitoring_type_tmp | sed -e 's/,/ /g')
now=`date -u -d"+8 hour" +'%Y-%m-%d %H:%M:%S'`
#------机器操作系统
OS_version=''
ifgrep -q 'CentOS release 6' /etc/redhat-release ; then
OS_version='CentOS6'
else
OS_version='CentOS7'
fi
#------ip地址
localip=`hostname -I | tr ' ' '\n' | grep -E '(^10\.|^172\.(1|2|31)|^192\.168)' | head -n 1`
send_warning()
{
发短信的函数
发送下面的msg变量
}
#------监控CPU相关信息
function sub_cpu(){
cpu_num=`grep -c 'model name' /proc/cpuinfo`
#------cpu 负载 15 minutes
load_15=`cat /proc/loadavg| awk '{print $2}'`
average_load=`echo "scale=2;a=$load_15/$cpu_num;if(length(a)==scale(a)) print 0;print a" | bc`
average_int=`echo $average_load | cut -f 1 -d "."`
if [ "${average_int}" -ge "${CPU_load_warn}" ];then
msg=${HOSTNAME}" "${localip}" System load average of 15 minutes is "${average_load}" more than "${CPU_load_warn}
echo "${now} ${msg}">> log
send_warning
fi
#------cpu 使用率
if [ ${OS_version} == 'CentOS6' ];then
cpu_idle=`top -b -n 1 | grep Cpu | awk '{print $5}' | cut -f 1 -d "."`
else
cpu_idle=`top -b -n 1 | grep Cpu | awk '{print $8}' | cut -f 1 -d "."`
fi
CPU_use=`expr 100 - $cpu_idle`
if [ "${CPU_use}" -ge "${CPU_use_warn}" ];then
msg=${HOSTNAME}" "${localip}" CPU utilization is "${CPU_use}"% more than "${CPU_use_warn}"%"
echo "${now} ${msg}">> log
send_warning
fi
}
#------监控内存
function sub_mem(){
MEM_use=`free | grep "Mem" | awk '{printf("%d", $3*100/$2)}'`
if [ $MEM_use -ge $MEM_use_warn ];then
msg=${HOSTNAME}" "${localip}" Mem_used:"${MEM_use}"% more than "${MEM_use_warn}"%"
echo "${now} ${msg}">> log
send_warning
fi
#SWAP有很多环境为0 例如在AWS云，腾讯云上
#SWAP_use=`free | grep "Swap" | awk '{printf("%d", $3*100/$2)}'`
#if [ $SWAP_use -ge $SWAP_use_warn ];then
#
#send_warning
#fi
}
#------监控硬盘空间
function sub_disk(){
#[注意这里用df -P]
for DISK_space in `df -P | grep /dev | grep -v -E '(tmp|boot)' | awk '{print $5}' | cut -f 1 -d "%" `
do
if [ $DISK_space -ge "${DISK_space_warn}" ]; then
msg=${HOSTNAME}" "${localip}" Hard disk space :"${DISK_space}"% more than "${DISK_space_warn}"%"
echo "${now} ${msg}">> log
send_warning
fi
done
}
#------监控网络相关
function sub_net(){
#------syn 半连接数
Net_SYN_count=`ss -an | grep -ic syn`
if [ "${Net_SYN_count}" -ge "${Net_SYN_count_warn}" ]; then
msg=${HOSTNAME}" "${localip}" Net SYN count :"${Net_SYN_count}" more than "${Net_SYN_count_warn}
echo "${now} ${msg}">> log
send_warning
fi
}
#------监控项
for type in $Monitoring_type
do
[ "${type}" == 'disk' ] && sub_disk
[ "${type}" == 'cpu' ] && sub_cpu
[ "${type}" == 'mem' ] && sub_mem
[ "${type}" == 'net' ] && sub_net
[ "${type}" == 'io' ] && sub_io
#[ "${type}" == 'alive' ] && sub_alive
done
#判断端口是否通 也是判断是否alive的
#!/bin/bash
#Alive=`echo -e "\n" | telnet192.168.1.30 22 | grep Connected | wc -l`
#if [ "$Alive" == 1 ];then
# echo "0" #如果JG等于1，端口为通，输出0
#else
# echo "1" #如果JG等于0，端口不通，输出1
#fi
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