shell脚本基础

Posted 2020-11-01

一、告警系统主脚本

[[email protected] ~]# cd /usr/local/sbin/
##脚本基本都放在这个文件夹下，方便管理
[[email protected] sbin]# mkdir mon
##创建监控脚本主目录
[[email protected] sbin]# cd mon
[[email protected] mon]# mkdir bin conf shares log mail
##创建监控子目录
[[email protected] mon]# cd bin
[[email protected] bin]# vim main.sh
##创建入口shell脚本文件，主脚本文件写入以下内容

#!/bin/bash
#Written by taoyuan
# 是否发送邮件的开关
export send=1
# 过滤ip地址
export addr= `/sbin/ifconfig |grep -A1 "ens33: "|awk ‘/inet/ {print $2}‘`
dir=`pwd`
#只需要最后一级目录名
last_dir=`echo $dir|awk -F ‘/‘ ‘{print $NF}‘`
#下面的判断目的是，保证执行脚本的时候，我们在bin目录里，不然监控脚本、邮件和日志很有可能找不到
if [ $last_dir == "bin" ] || [ $last_dir == "bin/" ]; then
    conf_file="../conf/mon.conf"
else
    echo "you shoud cd bin dir"
    exit
fi
exec 1>>../log/mon.log 2>>../log/err.log
echo "`date +"%F%T"` load average"
/bin/bash ../shares/load.sh
#先检查配置文件中是否需要监控502
if grep -q ‘to_mon_502=1‘ $conf_file; then
    export log=`grep ‘logfile=‘ $conf_file |awk -F ‘=‘ ‘{print $2}‘ |sed‘s/ //g‘`
    /bin/bash ../shares/502.sh
fi

二、告警系统配置文件

[[email protected] bin]# cd ../conf/
[[email protected] conf]# vim mon.conf

##to config the options if to monitor
## 定义mysql的服务器地址、端口以及user、password
to_mon_cdb=0 ##0 or 1,default 0,0 not monitor,1 monitor
db_ip=10.20.30.40
db_port=3315
db_user=username
db_pass=passwd
## httpd 如果是1则监控，为0不监控
to_mon_httpd=0
## php 如果是1则监控，为0不监控
to_mon_php_socket=0
## http_code_502 需要定义访问日志的路径
to_mon_502=1
logfile=/data/log/xxx.xxx.com/access.log
## request_count 定义日志路径以及域名
to_mon_request_count=0
req_log=/data/log/www.discuz.net/access.log
domainname=www.discuz.net

三、告警系统监控项目

[[email protected] conf]# cd ../shares/
[[email protected] shares]# vim load.sh

#!/bin/bash
##Writen by zlinux##
load=`uptime |awk -F ‘average:‘ ‘{print $2}‘|cut -d‘,‘ -f1|sed ‘s/ //g‘|cut -d. -f1`
if [ $load -gt 20 ] && [ $send -eq "1" ]
then
    echo "$addr `date+%T` load is $load" >../log/load.tmp
    /bin/bash ../mail/mail.sh $addr\_load $load ../log/load.tmp
fi
echo "`date +%T` load is $load"

[[email protected] shares]# vim 502.sh

#! /bin/bash
d=`date -d " 1 min" +%H:%M`
c_502=`grep :$d: $log |grep ‘ 502 ‘|wc -l`
if [ $c_502 -gt 10 ] && [ $send == 1 ]; then
    echo "$addr $d 502 count is $c_502">../log/502.tmp
    /bin/bash ../mail/mail.sh $addr\_502 $c_502 ../log/502.tmp
fi
echo "`date +%T` 502 $c_502"

[[email protected] shares]# vim disk.sh

#!/bin/bash
##Writen by zlinu##
rm -f ../log/disk.tmp
for r in `df -h |awk -F ‘[ %]+‘ ‘{print $5}‘|grep -v Use`
do
    if [ $r -gt 90 ] && [ $send -eq "1" ]
then
    echo "$addr `date +%T` disk useage is $r" >>../log/disk.tmp
fi
if [ -f ../log/disk.tmp ]
then
    df -h >>../log/disk.tmp
    /bin/bash ../mail/mail.sh $addr\_disk $r ../log/disk.tmp
    echo "`date +%T` disk useage is nook"
else
    echo "`date +%T` disk useage in ok"
fi