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Centos 7安装Fail2ban防御暴力破解密码（配合FirewallD）-小飞侠-51CTO博客
source link: http://blog.51cto.com/jack88/2070032
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fail2ban可以监视你的系统日志，然后匹配日志的错误信息（正则表达式匹配）执行相应的屏蔽动作（一般情况下是调用防火墙屏蔽）。比如有人在试探你的SSH、SMTP、FTP密码，只要达到你预设的次数，fail2ban就会调用防火墙屏蔽这个IP，而且可以发送e-mail通知系统管理员。安装EPEL源yum-yinstallepel-release.noarch安装支持firewalld的fail2ba
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