denyhosts是Python语言程序，借用tcp_wrapper程序来进行主机防护。作用：防止暴力破解服务器用户密码。
1、下载denyhosts
wget -c http://sourceforge.net/projects/denyhosts/files/denyhosts/2.6/DenyHosts-2.6.tar.gz
2、解压
tar -zxvf DenyHosts-2.6.tar.gz
3、安装
cd DenyHosts-2.6 python setup.py install
4、相关配置
进入目录：
cd /usr/share/denyhosts/
复制重命名一份配置文件
cp daemon-control-dist daemon-control cp denyhosts.cfg-dist denyhosts.cfg
根据具体配置daemon-control
vi daemon-control
将：
SECURE_LOG=/var/log/secure
改为：
SECURE_LOG=/var/log/denyhosts
设置启动脚本
chown root daemon-control chmod 700 daemon-control ./daemon-control start ln -s /usr/share/denyhosts/daemon-control /etc/init.d/denyhosts chkconfig --add denyhosts chkconfig --list denyhosts chkconfig denyhosts on
设置开机启动
vi /etc/rc.local
添加：
/usr/share/denyhosts/daemon-control start
启动服务：
service denyhosts start