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Fail2banÊÇÒ»¸ö¿ªÔ´µÄ·À»ðǽ¹¤¾ß£¬×¨ÃÅÓÃÀ´¼à¿ØϵͳÈÕÖ¾£¬²¢Í¨¹ýÉèÖùæÔòÀ´¼ì²âºÍ×èÖ¹¾ßÓжñÒâÒâͼµÄIPµØµã¡£ËüÄܹ»×Ô¶¯¼à¿ØϵͳµÄÈÕÖ¾Îļþ£¬µ±¼ì²âµ½ÆµÈÔʧ°ÜµÄµÇ¼ʵÑéʱ£¬»áÔÝʱեȡ¸ÃIPµØµãµÄ»á¼û£¬´Ó¶ø±ÜÃⱩÁ¦ÆƽâÐÐΪ¡£

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sudo apt-get install fail2ban

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sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local

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·­¿ªÐ½¨ÉèµÄÉèÖÃÎļþ/etc/fail2ban/jail.local£¬²¢Æ¾Ö¤ÐèÇó¾ÙÐб༭¡£ÒÔÏÂÊÇһЩ³£¼ûµÄÉèÖÃÏ

ignoreip: ºöÂÔijЩIPµØµã£¬²»¾ÙÐмì²âºÍ×èÖ¹¡£ÀýÈ磺ignoreip = 127.0.0.1/8

bantime: ·â½ûʱ¼ä£¬µ¥Î»ÎªÃ롣ĬÒÔΪ600Ãë¡£ÀýÈ磺bantime = 3600

maxretry: ×î´óÖØÊÔ´ÎÊý¡£ÈôÊÇij¸öIPµØµãÔÚһ׼ʱ¼äÄÚÒ»Á¬Ê§°ÜµÄ´ÎÊýÁè¼ÝÕâ¸öÖµ£¬ÄÇô¸ÃIPµØµã½«±»·â½û¡£ÀýÈ磺maxretry = 5

destemail: µ±ÓÐIPµØµã±»·â½ûʱ£¬·¢ËÍÓʼþ֪ͨµÄÄ¿µÄÓÊÏäµØµã¡£ÀýÈ磺destemail = admin@example.com

action: ´¥·¢·â½û²Ù×÷µÄÐж¯¡£¿ÉÒÔÊÇ·¢ËÍÓʼþ֪ͨ(admin)¡¢Ìí¼Óµ½·À»ðǽ(RBLOCK)µÈ¡£ÀýÈ磺action = %(action_mwl)s

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[DEFAULT]
ignoreip = 127.0.0.1/8
bantime = 3600
maxretry = 5
destemail = admin@example.com
action = %(action_mwl)s

[sshd]
enabled = true
port = ssh
logpath = %(sshd_log)s

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ËÄ¡¢Æô¶¯Fail2ban

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sudo systemctl start fail2ban

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sudo systemctl enable fail2ban

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Îå¡¢²âÊÔFail2ban

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ssh username@your_server_ip

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sudo fail2ban-client status

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[Fail2ban¹Ù·½ÍøÕ¾](https://www.fail2ban.org/)

[Fail2ban GitHub¿ÍÕ»](https://github.com/fail2ban/fail2ban)

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