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sudo yum install iptables

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sudo vi /etc/sysconfig/iptables

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# ÔÊÐíSSH»á¼û
-A INPUT -p tcp --dport 22 -j ACCEPT

# ÔÊÐíHTTP»á¼û
-A INPUT -p tcp --dport 80 -j ACCEPT

# ÔÊÐíHTTPS»á¼û
-A INPUT -p tcp --dport 443 -j ACCEPT

# ÔÊÐíPing»á¼û
-A INPUT -p icmp -j ACCEPT

# ÆäËü¹æÔò£¨Æ¾Ö¤ÐèÒªÌí¼Ó£©

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sudo systemctl restart iptables

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sudo systemctl list-unit-files | grep enabled

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# ÏÞÖÆÿ¸öIPµØµã×î´óÅþÁ¬ÊýΪ5
-A INPUT -p tcp -m connlimit --connlimit-above 5 -j REJECT --reject-with tcp-reset

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# ½«ÍⲿµÄ80¶Ë¿ÚÇëÇóת·¢µ½ÄÚ²¿Ð§ÀÍÆ÷µÄ8080¶Ë¿Ú
-A PREROUTING -t nat -p tcp --dport 80 -j REDIRECT --to-port 8080

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