解决DOS攻击生产案例

1 [root@nginx shell]# cat /etc/redhat-release 
2 CentOS release 6.7 (Final)
3 [root@nginx shell]# uname -r
4 2.6.32-573.el6.x86_64
5 [root@nginx shell]# /application/nginx/sbin/nginx -v
6 nginx version: nginx/1.10.3

#!/bin/bash

#-------------CopyRight-------------  
#   Name:Cut Ningx logs
#   Version Number:1.1  
#   Type:sh  
#   Language:bash shell  
#   Date:2018-05-16  
#   Author:xubing
#   QQ:442656067
#   Email:eeexu123@163.com  
#   Blog:https://www.cnblogs.com/eeexu123/


#Nginx日志轮询切割备份
IP=$(ifconfig eth0 | awk -F "[ :]+" ‘NR==2 {print $4}‘)

#cut every day nginx log
cut(){
  [ -d "/application/nginx/logs" ]||{
     echo "Nginx logs is not exist."
     exit 1 
  }

  cd /application/nginx/logs
  /bin/mv www_access.log www_access_$(date +%F).log
  /application/nginx/sbin/nginx -s reload
}

#tar nginx log file to /backup
backup(){
  [ -d "/backup/$IP" ]||{
     mkdir -p /backup/$IP
  }

  tar -zcf /backup/$IP/www_access_$(date +%F).log.tar.gz www_access_$(date +%F).log

  #rysnc /backup file to backup server
  rsync -avz /backup/$IP rsync_backup@172.16.1.41::backup/ --password-file=/etc/rsync.password  //推送到备份服务器上
}

#del before 7 day nginx log
del(){
  find /application/nginx/logs -type f -name "*$(date +%F).log" -mtime +7 | xargs rm -f
  find /backup/$IP -type f -name "*.tar.gz" -mtime +7 | xargs rm -f
}

main(){
  cut
  sleep 2
  backup
  sleep 2
  del
}
main

#!/bin/bash

#-------------CopyRight-------------  
#   Name:defined DoS
#   Version Number:1.1 
#   Type:sh  
#   Language:bash shell  
#   Date:2018-05-16 
#   Author:xubing
#   QQ:442656067
#   Email:eeexu123@163.com  
#   Blog:https://www.cnblogs.com/eeexu123/

ch_web_log(){
  awk ‘{print $1}‘ /application/nginx/logs/www_access_$(date +%F).log|sort|uniq -c|sort -rn -k1>/tmp/ip.log  //将统计的IP访问次数放到ip.log文件中

  while read line
  do
    PV=`echo $line|awk ‘{print $1}‘`    //IP访问次数
    IP=`echo $line|awk ‘{print $2}‘`
    if [ $PV -ge 100 -a `iptables -nL|grep "$IP"|wc -l` -lt 1 ];then   //将PV大于100的IP,并且防火墙上并没有封堵此IP。不然防火墙会重复封堵IP
       iptables -I INPUT -s $IP -j DROP     //防火墙封堵
       echo "$IP" >>/tmp/`date +%F`_ip.log  //将封堵的IP放到此文件中
       echo "The DROP ip is $IP"
    fi
  done</tmp/ip.log
}

#删除被防火墙封堵的IP
del(){
  exec </tmp/$(date +%F -d ‘1day ago‘)_ip.log
  while read line
  do
    iptables -D INPUT -s $line -j DROP
  done
}

main(){
  ch_web_log
  sleep 2
  del
}
main