Shell脚本防范Dos攻击

#!/bin/bash
DATE=$(date +%d/%b/%Y:%H:%M)
LOG_FILE=/usr/local/nginx/logs/access.log  #通过访问日志提取IP地址
ABNORMAL_IP=$(tail -n5000 $LOG_FILE |grep $DATE |awk '{a[$1]++}END{for(i in a)if(a[i]>10)print i}')  #对于当前访问时间超过10此此标记为非法IP
 
for IP in $ABNORMAL_IP; do 
    if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; then
        iptables -I INPUT -s $IP -j DROP  #对非法IP的访问流量进行丢弃
        echo "$(date +'%F_%T') $IP" >> /tmp/drop_ip.log
    fi
done