Nagios是一个监视系统运行状态和网络信息的监视系统。Nagios能监视所指定的本地或远程主机以及服务，同时提供异常通知功能等
Nagios可运行在Linux/Unix平台之上，同时提供一个可选的基于浏览器的WEB界面以方便系统管理人员查看网络状态，各种系统问题，以及日志等等。
2012-11-30发布3.4.3 上一个版本是2011-11-09的3.4.2 遗留稳定版是2011-07-25的3.3.1
完全改进：3.4.3 - 11/30/2012
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- Reverted squeue changes intended for Nagios 4
- Reapplied all patches from 3.4.2 release
- Applied fix for pagination and sorting on status.cgi #381 (Phil Randal)
3.4.2 - 11/09/2012
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FIXES
* Fixed issue where deleting a downtime could cause Nagios to crash (Eric Stanley)
* Corrected logic so that end times for flexible downtimes are calculated from the downtime start rather than the current time in the case where Nagios is restarted (Eric Stanley)
* Fixed issue introduced by fix for bug #124 where flexible downtimes are not taken into account on Nagios restart. (Scott Wilkerson, Eric Stanley)
* Fixed bug #247: If a service reports no performance data, the perfdata log file has no line indicating the test. (omnikron@free.fr)
* Fixed link for unhandled unreachable host problems on tactical overview page (Rudolf Cejka)
* Fixed bug #345 with wild card searches not paging properly on status.cgi (Phil Randal)
* Fixed bug #343 on status.cgi where Service Group Summary can potentially show wrong totals (Mark Ziesemer)
下载：http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.4.3.tar.gz