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ÔÚÍøÂçʱ´ú£¬Ð§ÀÍÆ÷Çå¾²ÖÁ¹ØÖ÷Òª¡£Linux×÷ΪһÖÖÆÕ±éʹÓõIJÙ×÷ϵͳ£¬ÌṩÁ˸»ºñµÄÏÂÁîºÍ¹¤¾ßÀ´Î¬»¤Ð§ÀÍÆ÷µÄÇå¾²ÐÔ¡£±¾ÎĽ«ÏÈÈÝһЩ³£ÓõÄLinuxÏÂÁ×ÊÖúÖÎÀíÔ±±£»¤Ð§ÀÍÆ÷µÄÇå¾²¡£

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sudo apt-get update          # ¸üÐÂÈí¼þ°üÁбí
sudo apt-get upgrade         # ¸üÐÂÒÑ×°ÖõÄÈí¼þ°ü

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

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

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

# ĬÈϾܾøËùÓÐÆäËûÁ÷Á¿
sudo iptables -P INPUT DROP

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# ÉèÖÃÓû§ÃÜÂë
sudo passwd username

# ·­¿ªÃÜÂëÓâÆÚÌáÐѹ¦Ð§
sudo chage -M 90 username

# ½ûÓÃÓû§ÃÜÂë
sudo passwd -l username

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ÒÔÉÏʾÀýÖУ¬ÎÒÃÇÉèÖÃÁËÓû§ÃûΪ”username”µÄÓû§µÄÃÜÂ룬²¢ÇÒ·­¿ªÁËÃÜÂëÓâÆÚÌáÐѹ¦Ð§£¬Ê¹µÃÃÜÂëÔÚ90ÌìºóÓâÆÚ¡£Í¬Ê±£¬¿ÉÒÔʹÓÃpasswd -lÏÂÁîÀ´½ûÓÃÓû§ÃÜÂë¡£

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# ²éÕÒÒªº¦´Ê"error"µÄÈÕÖ¾¼Í¼
sudo grep "error" /var/log/syslog

# Éó²é×îºó10ÐÐÈÕÖ¾
sudo tail -n 10 /var/log/syslog

# ʹÓÃawkÌáÈ¡Ìض¨ÐÅÏ¢
sudo awk '/error/ {print $3}' /var/log/syslog

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https://www.digitalocean.com/community/tutorials/an-introduction-to-linux-firewalld-commands

https://linuxize.com/post/about-the-pam-chage-password-expiry-guide/

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