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sudo yum install -y iptables-services

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# Çå¿ÕÄ¿½ñ·À»ðǽ¹æÔò
sudo iptables -F

# ÔÊÐí ssh ÅþÁ¬
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# ÔÊÐí HTTP ºÍ HTTPS ÅþÁ¬
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT

# ¾Ü¾øÆäËüÈëÕ¾ÅþÁ¬
sudo iptables -A INPUT -j REJECT

# ÔÊÐíËùÓгöÕ¾ÅþÁ¬
sudo iptables -A OUTPUT -j ACCEPT

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sudo yum install -y mailx

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sudo vi /etc/aliases

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root:    your-email@example.com

# ¸üÐÂÉèÖÃÎļþ
sudo newaliases

# ²âÊÔÓʼþ·¢ËÍ
echo "Test email content" | mail -s "Test email subject" your-email@example.com

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sudo yum update -y

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