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sudo apt-get update

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sudo passwd newuser  # ÉèÖÃÓû§ÃÜÂë
sudo usermod -aG sudo newuser  # ½«Óû§¼ÓÈësudo×飬ÊÚÓèÖÎÀíԱȨÏÞ

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sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT  # ÔÊÐíSSHÅþÁ¬
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT  # ÔÊÐíHTTPÅþÁ¬
sudo iptables -A INPUT -j DROP  # ÆäËûÁ÷Á¿ËùÓоܾø

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ssh-keygen -t rsa -b 4096

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tail -f /var/log/auth.log  # ʵʱ¼à¿ØÈÏÖ¤ÈÕÖ¾
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