NAGIOS
Nagios® is a system and network monitoring application. It watches hosts and services that you specify, alerting you when things go bad and when they get better.
Nagios® 是一个在linux及unix环境下运行的监控系统和网络的应用程序，它监控您所指定的主机和服务，并在情况变得更糟或更好时提醒您注意。
Nagios was originally designed to run under Linux, although it should work under most other unices as well.
Nagios 最初被设计成运行在 Linux 上的，虽然它也能在大多数其它系统中也能同样工作。
Some of the many features of Nagios® include:
Nagios 包括以下一些功能：
Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
监控网络服务 (SMTP、POP3、HTTP、NNTP、PING 等)
Monitoring of host resources (processor load, disk usage, etc.)
监控主机资源（处理器负载、磁盘使用情况等）
Simple plugin design that allows users to easily develop their own service checks
简单的插件设计允许用户可以很简易地开发它们自己的服务检查
Parallelized service checks
并行服务检查
Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down and those that are unreachable
可以通过 "parent" 来定义网络主机的继承，可以检测和区分主机的当机状态和不可达状态
Contact notifications when service or host problems occur and get resolved (via email, pager, or user-defined method)
在服务或主机产生问题和修复时获得通知（通过邮件、页面或用户定制的方式）
Ability to define event handlers to be run during service or host events for proactive problem resolution
可以在服务和主机事件运行期间定义事件处理器，以便主动解决问题。
Automatic log file rotation
日志文件自动循环
Support for implementing redundant monitoring hosts
支持冗馀监控主机的实现
Optional web interface for viewing current network status, notification and problem history, log file, etc.
可选的 Web 界面，该界面用于查看当前网络状态、通知和问题列表、日志文件等