ubuntu 安装 Nagios服务器监控软件的步骤如下：
1, sudo apt-get install nagios3 ，尝试 http://你的网站/nagios3 ， 会发现需要认证。
2, 创建登录用户， sudo htpasswd -c /etc/nagios3/htpasswd.user yaozer (你的用户名)
这样就能登录 http://你的网站/nagios3 了 ，但是会无法显示服务器运行信息，It appears as though you do not have permission to view information for any of the services you requested…, 接着做第三步，增加cgi权限，
3, sudo gedit /etc/nagios3/cgi.cfg ， 把所有形如：authorized_for_configuration_information=nagiosadmin, authorized_for_system_commands=nagiosadmin, 之类 的改成 authorized_for_configuration_information=nagiosadmin,yaozer (你的用户名).
4. sudo /etc/init.d/nagios3 restart , sudo /etc/init.d/apache2 restart ,重启一切OK。
作者：yaozer 原文链接：ubuntu 安装 Nagios服务器监控软件
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