如果我们的网站遭遇 CC 和 DDoS 攻击时，我们可以用这个方法来简单的防御。可以根据系统的负载状态通过CloudflareAPI实现自动开启5秒盾。
项目地址
https://github.com/Machou/Cloudflare-Bloc操作步骤
当服务器受到攻击时，系统负载就会爆增，利用脚本自动检测系统负载，当压力超过一定的值时就可以切换为” I’m Under Attack! “模式了。
#下载
cd /root && git clone https://github.com/Machou/Cloudflare-Block.git DDoS
#打开Cloudflare.sh，修改配置
API_KEY You're Global API Key (https://dash.cloudflare.com/profile)
MAIL_ACCOUNT Email of your Cloudflare account
DOMAIN Zone ID (https://dash.cloudflare.com/_zone-id_/domain.com)
#设置定时任务
crontab -e
*/1 * * * * /root/DDoS/Cloudflare.sh 0 # check every 1 minute if protection is not enabled
*/20 * * * * /root/DDoS/Cloudflare.sh 1 # check every 20 minutes if prot完整源代码
脚本默认的是检测系统负载为 10，启动” I’m Under Attack! “模式，你以根据需要来调整。脚本如下：
#!/bin/bash
# $1 = 1min, $2 = 5min, $3 = 15min
loadavg=$(cat /proc/loadavg|awk '{printf "%f", $1}')
# load is 10, you can modify this if you want load more than 10
maxload=10
# Configuration API Cloudflare
# You're Global API Key (https://dash.cloudflare.com/profile)
api_key=
# Email of your account Cloudflare
email=
# Zone ID (https://dash.cloudflare.com/_zone-id_/domain.com)
zone_id=
# create file attacking if doesn't exist
if [ ! -e $attacking ]; then
echo 0 > $attacking
fi
attacking=./attacking
hasattack=$(cat $attacking)
if [ $(echo "$loadavg > $maxload"|bc) -eq 1 ]; then
if [[ $hasattack = 0 && $1 = 0 ]]; then
# Active protection
echo 1 > $attacking
curl -s -X PATCH "https://api.cloudflare.com/client/v4/zones/$zone_id/settings/security_level" \
-H "X-Auth-Email: $email" \
-H "X-Auth-Key: $api_key" \
-H "Content-Type: application/json" \
--data '{"value":"under_attack"}'
fi
else
if [[ $hasattack = 1 && $1 = 1 ]]; then
# Disable Protection
echo 0 > $attacking
curl -s -X PATCH "https://api.cloudflare.com/client/v4/zones/$zone_id/settings/security_level" \
-H "X-Auth-Email: $email" \
-H "X-Auth-Key: $api_key" \
-H "Content-Type: application/json" \
--data '{"value":"high"}'
fi
fi
exit 0宝塔面板计划任务
我们如果想省点事就直接复制上面第一条中的脚本代码，放在计划任务的 shell 脚本之中，也可以是同样的效果。
问题解决
bc: command not found解决：
yum -y install bc
/attacking 文件不存在
把脚本代码中 26 行的 attacking=./attacking 剪切到 20 行