iptables -F #清除防火墙策略
iptables -A INPUT -p tcp --tcp-flags ALL FIN,URG,PSH -j Drop
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j Drop
iptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j Drop
iptables -A INPUT -p tcp --tcp-flags SYN,SYN --dport 80 -j Drop
卸载阿里云的云盾（安骑士），因为服务器本来就内存紧张，云盾弊大于利，卸载
wget http://update.aegis.aliyun.com/download/uninstall.sh
chmod +x uninstall.sh
./uninstall.sh
wget http://update.aegis.aliyun.com/download/quartz_uninstall.sh
chmod +x quartz_uninstall.sh
./quartz_uninstall.sh
pkill aliyun-service
rm -fr /etc/init.d/agentwatch /usr/sbin/aliyun-service
rm -rf /usr/local/aegis*
注意：卸载完成后，可以删除以上两个脚本文件。如果无法wget到文件，请联系站长索要！
屏蔽云盾IP，云盾会定期扫描服务器模拟黑客攻击
vim shield_ip.sh
添加如下内容：
#!/bin/bash
echo "开始屏蔽云盾扫描云服务器的IP"
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.201.0/28" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.201.16/29" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.201.32/28" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.192/29" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.200/30" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.184/29" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.183/32" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.206/32" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.205/32" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.195/32" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="140.205.225.204/32" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.224.0/26" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.224.64/26" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.224.128/26" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.224.192/26" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.222.64/26" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.222.128/26" drop'
firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address="106.11.222.192/26" drop'
