基本参考 http://nagios.sourceforge.net/docs/3_0/quickstart-ubuntu.html,直接apt-get install的话应该更快。要监控url,参考:http://stackoverflow.com/questions/9246557/monitoring-urls-with-nagios

如何避免sendmail发出的邮件被当做垃圾邮件

http://blog.csdn.net/passion_wang/article/details/6259594