监控主机配置：redhatlinuxas4，nagios3
被监控主机：WindowsServer2008R2Enterprise，nsclient++0.4.4.172
Nagios是一款开源的免费网络监视工具，其功能强大，灵活性强。能有效监控Windows、Linux和Unix的主机状态，交换机路由器等网络设置，打印机等。nagios监控windows系统有三种实现方式：SNMP、NSClient++、NRPE。
下面介绍使用NSClient++方式来监控Windows：
在windows下安装nsclient++，运行NSCP-0.4.0.172-x64.msi安装文件，一步一步往下走，其中需要设置nagios监控主机IP和NSClient密码（值当使用check_nt时使用）。
Allowed hosts：填写nagios监控主机IP。
NSClient Password：当使用命令check_nt时需要设置密码，根据自己情况设置。
Module to load：根据自己的需要选择相应的模块。
安装完毕以后，打开windows服务管理器，查看nsclient服务是否启动，然后在nagios监控主机上面进行相关的配置，主要涉及两个配置文件nagios.cfg和windows.cfg。
1、 因为nagios是模块化调用,先到配置文件打开windows相关模块，编辑nagios.cfg文件：
[root@localhostetc]#ls
cgi.cfghtpasswdnagios.cfgnrpe.cfgobjectsobjects.bakobjects.tarresource.cfg
[root@localhostetc]#pwd
/usr/local/nagios/etc
[root@localhostetc]#vinagios.cfg
将#cfg_file=/usr/local/nagios/etc/objects/windows.cfg该行前面的#注释去掉即可。
2、修改windows.cfg配置文件，需要修改define host和define service两部分：
#DefineahostfortheWindowsmachinewe'llbemonitoring
#Changethehost_name,alias,andaddresstofityoursituation
definehost
{usewindows-server;Inheritdefaultvaluesfromatemplate
host_namevideo4-beijing;Thenamewe'regivingtothishost被监控主机的主机名
aliasvideo4-beijing;Alongernameassociatedwiththehost
contact_groupssa;
address10.12.4.169;IPaddressofthehost被监控主机的IP}
#CreateaserviceformonitoringCPUload
#Changethehost_nametomatchthenameofthehostyoudefinedabove
defineservice
{usegeneric-service
host_namevideo4-beijing
service_descriptionCPULoad
check_commandcheck_nt!CPULOAD!-l5,80,90
contact_groupssa}
#Createaserviceformonitoring
#Changethehost_nametomatchthenameofthehostyoudefinedabove
defineservice
{usegeneric-service
host_namevideo4-beijing
service_descriptionMemoryUsage
check_commandcheck_nt!MEMUSE!-w80-c90
contact_groupssa}
#CreateaserviceformonitoringC:/diskusage
#Changethehost_nametomatchthenameofthehostyoudefinedabove
defineservice
{usegeneric-service
host_namevideo4-beijing
service_descriptionC:/DriveSpace
check_commandcheck_nt!USEDDISKSPACE!-lc-w80-c90
contact_groupssa}
3、修改完相关的配置文件以后，执行如下命令检查配置文件是否正确：
[root@localhostobjects]#/usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios.cfg
4、遇到的问题，在检查配置文件时错误信息如下：
Checkingservices...
Error:Contactgroup'admins'specifiedinservice'C:/DriveSpace'forhost'video4-beijing'isnotdefinedanywhere!
Error:Contactgroup'admins'specifiedinservice'Explorer'forhost'video4-beijing'isnotdefinedanywhere!
Error:Contactgroup'admins'specifiedinservice'MemoryUsage'forhost'video4-beijing'isnotdefinedanywhere!
Checked14services.
Checkinghosts...
Error:Contactgroup'admins'specifiedinhost'video4-beijing'isnotdefinedanywhere!
Checked7hosts.
Checkinghostgroups...
Checked2hostgroups.
Checkingservicegroups...
Checked0servicegroups.
Checkingcontacts...
Checked1contacts.
Checkingcontactgroups...
Checked1contactgroups.
Checkingserviceescalations...
Checked0serviceescalations.
Checkingservicedependencies...
Checked0servicedependencies.
Checkinghostescalations...
Checked0hostescalations.
Checkinghostdependencies...
Checked0hostdependencies.
Checkingcommands...
Checked25commands.
Checkingtimeperiods...
Checked5timeperiods.
Checkingforcircularpathsbetweenhosts...
Checkingforcircularhostandservicedependencies...
Checkingglobaleventhandlers...
Checkingobsessivecompulsiveprocessorcommands...
Checkingmiscsettings...
TotalWarnings:0
TotalErrors:4
***>Oneormoreproblemswasencounteredwhilerunningthepre-flightcheck...
Checkyourconfigurationfile(s)toensurethattheycontainvalid
directivesanddatadefintions.Ifyouareupgradingfromaprevious
versionofNagios,youshouldbeawarethatsomevariables/definitions
mayhavebeenremovedormodifiedinthisversion.Makesuretoread
theHTMLdocumentationregardingtheconfigfiles,aswellasthe
'WhatsNew'sectiontofindoutwhathaschanged.
以上问题的原因是因为一开始在windows.cfg文件中定义host和service时没有增加contact_groupssa这个字段，host和service默认所在的contact_group为admins，而我的nagios监控主机contacts.cfg文件中配置的contactgroup为sa。
