这篇文章主要介绍了centOs下怎么安装和使用DenyHosts的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇centOs下怎么安装和使用DenyHosts文章都会有所收获，下面我们一起来看看吧。
DenyHosts是Python语言写的一个程序，它会分析sshd的日志文件（/var/log/secure），当发现重 复的攻击时就会记录IP到/etc/hosts.deny文件，从而达到自动屏IP的功能。
[root@localhost ~]# wget http://jaist.dl.sourceforge.net/project/denyhosts/denyhosts/2.6/DenyHosts-2.6.tar.gz
[root@localhost ~]# tar xf DenyHosts-2.6.tar.gz[root@localhost ~]# cd DenyHosts-2.6[root@localhost DenyHosts-2.6]# python setup.py install
[root@localhost DenyHosts-2.6]# cp denyhosts.cfg-dist /etc/denyhosts.cfg[root@localhost DenyHosts-2.6]# cp daemon-control-dist daemon-control[root@localhost DenyHosts-2.6]# chown root daemon-control[root@localhost DenyHosts-2.6]# chmod 700 daemon-control
将daemon-control中的#DENYHOSTS_CFG = “/usr/share/denyhosts/denyhosts.cfg”改为 DENYHOSTS_CFG = “/etc/denyhosts.cfg”
启动
[root@localhost DenyHosts-2.6]# ./daemon-control start（注意相对路径）
默认允许五次，测试发现登陆失败五次之后不允许登陆
[root@localhost ~]# ssh abc@172.16.1.16abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). [root@localhost ~]# [root@localhost ~]# ssh abc@172.16.1.16 abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). [root@localhost ~]# ssh abc@172.16.1.16abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). [root@localhost ~]# ssh abc@172.16.1.16 abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied, please try again. abc@172.16.1.16's password: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). [root@localhost ~]# ssh abc@172.16.1.16ssh_exchange_identification: read: Connection reset by peer
查看hosts.deny文件
登陆连续失败之后就会把ip地址写在hosts.deny文件 
172.16.1.112的ip已经被限制，到此功能实现。
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