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sudo yum install iptables iptables-services
sudo systemctl enable iptables
sudo systemctl start iptables

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sudo iptables -P INPUT DROP                  # ĬÈϾܾøËùÓÐÊäÈë
sudo iptables -P FORWARD DROP                # ĬÈϾܾøËùÓÐÀ´×ÔÆäËû½Ó¿ÚµÄת·¢
sudo iptables -P OUTPUT ACCEPT               # ĬÈÏÔÊÐíËùÓÐÊä³ö
sudo iptables -A INPUT -i lo -j ACCEPT        # ÔÊÐíÍâµØ»Ø»·½Ó¿Ú
sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT   # ÔÊÐíÒѽ¨ÉèÅþÁ¬µÄͨѶ
sudo iptables -A INPUT -p icmp -j ACCEPT      # ÔÊÐíICMPЭÒéͨѶ
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT  # ÔÊÐíSSH»á¼û
sudo service iptables save                    # ÉúÑÄÉèÖÃ
sudo systemctl restart iptables              # ÖØÐÂÆô¶¯·À»ðǽ

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sudo systemctl disable <service>

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sudo yum update

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