用nagios來(lái)監(jiān)控網(wǎng)絡(luò)服務(wù)器和網(wǎng)絡(luò)服務(wù)

Nagiosnagios可以對(duì)服務(wù)器進(jìn)行全面的監(jiān)控，包括服務(wù)(apache、mysql、ntp、dns、disk、qmail和sshd等等)的狀態(tài)，服務(wù)器的狀態(tài)(up、down等等)。它是一個(gè)完全GPL協(xié)議的開(kāi)源軟件包，包含有nagios主程序和它的各個(gè)插件，配置非常靈活，可以監(jiān)視的項(xiàng)目很多，可以自定義shell腳本進(jìn)行監(jiān)控服務(wù)，非常適合大型網(wǎng)絡(luò)。nagios的包含主動(dòng)監(jiān)控和被動(dòng)監(jiān)控。主動(dòng)檢查是通過(guò)監(jiān)控中心的主機(jī)發(fā)出請(qǐng)求，讓運(yùn)行在遠(yuǎn)程主機(jī)上的nrpe守護(hù)進(jìn)程收集信息，然后報(bào)告它，它通過(guò)web接口把數(shù)據(jù)顯示在頁(yè)面上。它的工作原理如下：被動(dòng)監(jiān)控是當(dāng)遠(yuǎn)程被監(jiān)控主機(jī)處于防火墻之內(nèi)的時(shí)候，只有遠(yuǎn)程主機(jī)可以訪問(wèn)到監(jiān)控中心，防火墻之內(nèi)可以設(shè)置另外一個(gè)監(jiān)控中心，遠(yuǎn)程監(jiān)控中心的nagios收集服務(wù)器信息以后，和nsca報(bào)告，由naca客戶端報(bào)告naca的服務(wù)器端，然后報(bào)告監(jiān)控中心的nagios，通過(guò)web接口顯示監(jiān)控結(jié)果。nagios的功能非常強(qiáng)大，/是它的窩，只有e文、法文和日文，沒(méi)有中文，可惜啊。我現(xiàn)在引用它的一段文字進(jìn)行總結(jié)一下到底什么是nagios：WhatIsThis?什么是nagios？Nagios®isasystemandnetworkmonitoringapplication.Itwatcheshostsandservicesthatyouspecify,alertingyouwhenthingsgobadandwhentheygetbetter.NagioswasoriginallydesignedtorununderLinux,althoughitshouldworkundermostotherunicesaswell.SomeofthemanyfeaturesofNagios®include:Monitoringofnetworkservices(SMTP,POP3,HTTP,NNTP,PING,etc.)Monitoringofhostresources(processorload,diskusage,etc.)SimpleplugindesignthatallowsuserstoeasilydeveloptheirownservicechecksParallelizedservicechecksAbilitytodefinenetworkhosthierarchyusing"parent"hosts,allowingdetectionofanddistinctionbetweenhoststhataredownandthosethatareunreachableContactnotificationswhenserviceorhostproblemsoccurandgetresolved(viaemail,pager,oruser-definedmethod)AbilitytodefineeventhandlerstoberunduringserviceorhosteventsforproactiveproblemresolutionAutomaticlogfilerotationSupportforimplementingredundantmonitoringhostsOptionalwebinterfaceforviewingcurrentnetworkstatus,notificationandproblemhistory,logfile,etc.Nagios是一個(gè)監(jiān)視系統(tǒng)和網(wǎng)絡(luò)的應(yīng)用程序。它監(jiān)視你所指定主機(jī)和服務(wù)，當(dāng)監(jiān)視的內(nèi)容變好或者變壞時(shí)發(fā)出警告。Nagios最初是被設(shè)計(jì)在Linux平臺(tái)上運(yùn)行的，然而現(xiàn)在在其他平臺(tái)上也運(yùn)行良好。Nagios的特性包括：監(jiān)視網(wǎng)絡(luò)服務(wù)（SMTP,POP3,HTTP,NNTP,PING等等）監(jiān)視主機(jī)資源（處理器負(fù)載、磁盤空間等）容許用戶開(kāi)發(fā)自己的插件去檢查自定義的項(xiàng)目；通過(guò)使用“父主機(jī)”，定義網(wǎng)絡(luò)主機(jī)的分層，容許探測(cè)主機(jī)down掉或者不可到達(dá)。可以定義在主機(jī)或服務(wù)運(yùn)行期間，事件發(fā)生以后如何處理和解決方式；自動(dòng)記錄錯(cuò)誤日志；支持冗余監(jiān)視；可選web接口，通過(guò)web頁(yè)面查看當(dāng)前網(wǎng)絡(luò)狀態(tài)，提示和報(bào)告故障歷史，日志文件等；Nagios的系統(tǒng)要求：Linux、Unix等apacheGD庫(kù)（1.63以上）zlibpnglibjpeglibbasicicons等,其中apache的安裝在blog中已經(jīng)有相關(guān)的文章，搜索一下就行;gd、zlib、pnglib和jpeglib安裝比較簡(jiǎn)單，步驟：下載tarballtarzxvfxxx.tar.gzcdxxx./configuremake&&makeinstallNagios的安裝過(guò)程(FreeBSD)nagios的安裝比較簡(jiǎn)單，復(fù)雜的是設(shè)置和配置參數(shù)的設(shè)定。不過(guò)你要放松一點(diǎn)，畢竟我們要搞定它，不是嗎？那就開(kāi)始吧：1：獲得最新的安裝包，/download2：以root身份登錄服務(wù)器，目前最新的版本是2.5：nagios，版本2.5：fetch/sourceforge/nagios/nagios-2.5.tar.gzorwget/sourceforge/nagios/nagios-2.5.tar.gz獲得nagios插件，版本1.4.3：/sourceforge/nagiosplug/nagios-plugins-1.4.3.tar.gz3）獲得圖庫(kù)文件：/nagios/imagepak-base.tar.gzNRPE，版本2.5.2/sourceforge/nagios/nrpe-2.5.2.tar.gzNSCA，版本2.6/sourceforge/nagios/nsca-2.6.tar.gz3：切換到root用戶：sudosu4：解壓縮tarzxvfnagios-2.5.tar.gz5：建立運(yùn)行nagios的用戶：addusernagios6：建立安裝nagios的文件夾，并使這個(gè)文件夾的所有者為nagios:nagiosmkdir/usr/local/nagioschownnagios.nagios/usr/local/nagios7：確認(rèn)web服務(wù)器的用戶可能會(huì)通過(guò)web接口執(zhí)行一些命令，必須確定web服務(wù)器以哪個(gè)用戶運(yùn)行的，通常為apache：grep"AUser"/usr/local/apache2/conf/httpd.conf8：建立命令文件組這個(gè)新的組會(huì)包括apache的用戶和nagios的用戶pwgroupaddnagcmdpwusermodapache-Gnagcmdpwusermodnagios-Gnagcmdcat/etc/groupnagcmd:*:9007:apache,nagios8：運(yùn)行配置腳本并安裝nagioscdnagios-2.5./configure--prefix=/usr/local/nagios--with-gd-lib=/usr/local/lib--with-gd-inc=/usr/local/include***Configurationsummaryfornagios2.507-13-2006***GeneralOptions:Nagiosexecutable:nagiosNagiosuser/group:nagios,nagiosCommanduser/group:nagios,nagiosEmbeddedPerl:noEventBroker:yesInstall${prefix}:/usr/local/nagiosLockfile:${prefix}/var/nagios.lockInitdirectory:/usr/local/etc/rc.dHostOS:freebsd6.0WebInterfaceOptions:HTMLURL:http://localhost/nagios/CGIURL:http://localhost/nagios/cgi-bin/Traceroute(usedbyWAP):/usr/sbin/tracerouteReviewtheoptionsaboveforaccuracy.Iftheylookokay,type'makeall'tocompilethemainprogramandCGIs.makeallmakeinstallmakeinstall-initmakeinstall-commandmodemakeinstall-config9：安裝nagios-pluginstarzxvfnagios-plugins-1.4.3.tar.gzcdnagios-plugins-1.4.3./configure--prefix=/usr/local/nagios-pluginsmakeallmakeinstall安裝完成以后在/usr/local/nagios-plugins-plugins會(huì)產(chǎn)生一個(gè)libexec的目錄，將該目錄全部移動(dòng)到/usr/local/nagios目錄下即可。mv/usr/local/nagios-plugins-plugins/libexec//usr/local/nagios/10：imagepak-base.tar.gz的安裝tar-vzfimagepak-base.tar.gz解壓以后是base目錄mvbase//usr/local/nagios/share/images/logos/現(xiàn)在開(kāi)始配置：1：配置web接口假設(shè)你已經(jīng)運(yùn)行了apache，如果沒(méi)有，請(qǐng)參考：http://localhost/upload/blog.php?do-showone-tid-18.htmlvi/usr/local/apache2/conf/httpd.conf添加如下內(nèi)容：ScriptAlias/nagios/cgi-bin/usr/local/nagios/sbin<Directory"/usr/local/nagios/sbin">OptionsExecCGIAllowOverrideNoneOrderallow,denyAllowfromallAuthName"NagiosAccess"AuthTypeBasicAuthUserFile/usr/local/nagios/etc/htpasswd.usersRequirevalid-user</Directory>Alias/nagios/usr/local/nagios/share<Directory"/usr/local/nagios/share">OptionsNoneAllowOverrideNoneOrderallow,denyAllowfromallAuthName"NagiosAccess"AuthTypeBasicAuthUserFile/usr/local/nagios/etc/htpasswd.usersRequirevalid-user</Directory>修改完畢，保存文件，并重啟apache：/usr/local/apahce2/bin/apachectlrestart2：配置apache的BASIC認(rèn)證：生成認(rèn)證密碼：/usr/local/apache2/bin/htpasswd-/usr/local/nagios/etc/htpasswd.usersnagiosnagiosapache接口配置完成。開(kāi)始配置nagios：cd/usr/local/nagios/etc/在/usr/local/nagios/etc下是nagios的配置模板文件-sample,把.cfg-sample文件全部拷貝成.cfg例如:cpnagios.cfg-samplenagios.cfg全部拷貝完成即可.viminimal.cfg注釋所有command：注釋的方法是在每一個(gè)定義語(yǔ)句前面添加”#“修改cgi.cfg修改use_authentication=l為use_authentication=0,即不用驗(yàn)證.不然有一些頁(yè)面不會(huì)顯示?，F(xiàn)在檢查配置文件是否有語(yǔ)法錯(cuò)誤：/usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios.cfg如果正確，會(huì)顯示以下結(jié)果：TotalWarnings:0TotalErrors:0否則，需要根據(jù)提示進(jìn)行修改配置文件。配置文件等會(huì)再弄。現(xiàn)在啟動(dòng)nagios/usr/local/nagios/bin/nagios-d/usr/local/nagios/etc/nagios.cfg為了使nagios異常中斷，我們使用daemontools啟動(dòng)：安裝daemontool：mkdir-p/packagechmodl755/packagecd/packagefetchhttp://cr.yp.to/daemontools/daemontools-0.76.tar.gzcdadmin/daemontools-0.76/package/install檢查svscan進(jìn)程是否啟動(dòng)：psaux|grepsvscanroot 3760.00.0l6360con-IW- 0:00.00/bin/sh/command/svscanbootroot 4ll0.00.0l224208con-S8Jul060:42.50svscan/serviceok,啟動(dòng)正常了。cd/servicemkdirnagioschmodl755nagiostouch./runchmod755./runvirunPATH=/usr/local/bin:/usr/bin:/binexportPATHexecenv-PATH=$PATH\/usr/local/nagios/bin/nagios/usr/local/nagios/etc/nagios.cfgmkdirlogcdlogtouch./runchmod755./runvi./run#!/bin/shexecsetuidgidlogadminmultilogts1000000n100./mainmkdirmainchmod777mainchownnagios.nagiosmaintouchstatuschownnagios.nagiosstatussvc-u/service/nagios/svstat/service/nagios/root@##psauxww|grepnagiosroot232760.00.11176488??I5:00PM0:01.71supervisenagiosnagios342510.00.323161552??S6:06PM0:00.10/usr/local/nagios/bin/nagios/usr/local/nagios/etc/nagios.cfgroot@##ok,現(xiàn)在把nagios服務(wù)做成自動(dòng)啟動(dòng)的服務(wù)了。通過(guò)svc命令可以啟動(dòng)或者停止服務(wù)。svcoptsservicesoptsisaseriesofgetopt-styleoptions.servicesconsistsofanynumberofarguments,eachargumentnamingadirectoryusedbysupervise.-u:Up.Iftheserviceisnotrunning,startit.Iftheservicestops,restartit.-d:Down.Iftheserviceisrunning,senditaTERMsignalandthenaCONTsignal.Afteritstops,donotrestartit.-o:Once.Iftheserviceisnotrunning,startit.Donotrestartitifitstops.-p:Pause.SendtheserviceaSTOPsignal.-c:Continue.SendtheserviceaCONTsignal.-h:Hangup.SendtheserviceaHUPsignal.-a:Alarm.SendtheserviceanALRMsignal.-i:Interrupt.SendtheserviceanINTsignal.-t:Terminate.SendtheserviceaTERMsignal.-k:Kill.SendtheserviceaKILLsignal.-x:Exit.supervisewillexitassoonastheserviceisdown.Ifyouusethisoptiononastablesystem,you'redoingsomethingwrong;superviseisdesignedtorunforever.比如：停止nagios－－svc-d/service/nagios/重啟nagios－－svc-t/service/nagios/啟動(dòng)nagios－－svc-u/service/nagios/當(dāng)然，你也可以使用inited的方式進(jìn)行：/usr/local/etc/rc.d/nagiosstart/stop好了，反正daemontools很強(qiáng)大，以后慢慢熟悉，轉(zhuǎn)入正題?，F(xiàn)在打開(kāi)網(wǎng)頁(yè)：http://localhost/nagios/一定會(huì)讓你大吃一驚，呵呵，我的服務(wù)器和服務(wù)狀態(tài)都清楚的看到了?，F(xiàn)在我們的nagios中只有一個(gè)，那就是它自己，loca山ost,呵呵，等會(huì)我們添加別的主機(jī)和主機(jī)服務(wù)，ok,我們認(rèn)識(shí)一下nagios的廬山真面目：配置nagios：1） 為主機(jī)添加服務(wù)2） 添加主機(jī)并添加服務(wù)3） 停止一個(gè)服務(wù)4） 刪除一臺(tái)主機(jī)和服務(wù)5） 查看所有主機(jī)的故障6） 查看一臺(tái)特定的主機(jī)狀態(tài)7） 改變報(bào)警的時(shí)間間隔8） 改變發(fā)現(xiàn)故障的重試次數(shù)9） 如何在nagios中使用外部命令1）為主機(jī)添加一個(gè)服務(wù)為localhost主機(jī)添加qmail服務(wù)的監(jiān)控，方法如下：viminimal.cfgdefineservice{use generic-service;Nameofservicetemplatetousehost_name localhostTOC\o"1-5"\h\zservice_descriptionqmail_smtpis_volatile 0check_period 24x7max_check_attempts1normal_check_interval1retry_check_interval 1contact_groups adminsnotification_options w,u,c,rnotification_interval960notification_period 24x7check_command check_smtp!20%!10%!/

可以直接拷貝原有的進(jìn)行修改，我這個(gè)就是拷貝的原有的check」ocal_disk進(jìn)行的。修改host_name，service_description，check_command等defineservice{use generic-service;Nameofservicetemplatetousehost_name localhostservice_descriptionqmail_pop3TOC\o"1-5"\h\zis_volatile 0check_period 24x7max_check_attempts 1normal_check_interval1retry_check_interval 1contact_groupsnotification_optionsnotification_intervalnotification_periodcheck_command}contact_groupsnotification_optionsnotification_intervalnotification_periodcheck_command}照貓畫虎的進(jìn)行修改adminsw,u,c,r96024x7check_pop!20%!10%!/然后去修改：vicheckcommands.cfg#'check_qmail'commanddefinitiondefinecommand{command_namecheck_qmailcommand_line$USER1$/check_smtp-H}definecommand{command_namecheck_pop3command_line$USER1$/check_pop-H}保存，然后檢查配置文件：/usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios.cfg如果沒(méi)有錯(cuò)誤會(huì)顯示：TotalWarnings:0TotalErrors:0如果有錯(cuò)誤，請(qǐng)根據(jù)提示進(jìn)行錯(cuò)誤的修正。重啟nagiossvc-d/service/nagios/&&svc-u/service/nagios/通過(guò)web頁(yè)面檢查nagios的結(jié)果：53/nagios/點(diǎn)擊“ServiceDetail"會(huì)出現(xiàn)：2）添加主機(jī)并添加服務(wù)我們會(huì)監(jiān)控這臺(tái)主機(jī)的負(fù)載、磁盤等一些沒(méi)有通過(guò)端口方式啟動(dòng)的服務(wù)器狀態(tài)，以及它的服

務(wù)，比如：apache、mysql、qmail和ntp等等吧。那么沒(méi)有端口的nagios直接能監(jiān)控到嗎？答案是不行。所以我們必須在兩臺(tái)主機(jī)上安裝nrpe，nrpe可以啟動(dòng)5666端口，把檢測(cè)的信息源源不斷的傳給監(jiān)控中心的主機(jī)。ok,我們把a(bǔ)pache、mysql、qmail和ntp先加上，這回我們把監(jiān)控的主機(jī)和服務(wù)新建一個(gè)文件：cd/usr/local/nagios/etc/touch10_5_1_156.cfgvinagios.cfgcfg_file=/usr/local/nagios/etc/10_5_1_156.cfgvi10_5_1_156.cfg定義一個(gè)主機(jī)：definehost{use generic-host ;Nameofhosttemplatetousehost_nametest_nrpealias clientaddress56check_commandcheck-host-alivemax_check_attempts1check_period24x7notification_interval120notification_period24x7notification_optionsd,rcontact_groupsadmins}定義主機(jī)需要檢查的服務(wù)：defineservice{use generic-service ;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionPINGTOC\o"1-5"\h\zis_volatile 0check_period 24x7max_check_attempts1normal_check_interval1retry_check_interval 1contact_groups adminsnotification_options w,u,c,rnotification_interval960notification_periodcheck_command}notification_periodcheck_command}check_ping!100.0,20%!500.0,60%defineservice{

usegeneric-service;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionapacheis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_command}check_http!100.0,20%!500.0,60%defineservice{usegeneric-service;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionmysqlis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_command}check_mysql!100.0,20%!500.0,60%defineservice{usegeneric-service ;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionntpis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_period24x7

check_commandcheck_ntp!100.0,20%!500.0,60%}defineservice{usegeneric-service ;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionqmail_smtpis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_command}check_smtp!100.0,20%!500.0,60%defineservice{usegeneric-service ;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionqmail_pop3is_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_commandcheck_pop!100.0,20%!500.0,60%}現(xiàn)在我們象上次一樣把服務(wù)也定義完了

}現(xiàn)在我們象上次一樣把服務(wù)也定義完了new_host_serviceliu1084回復(fù)于：2006-08-1418:29:02此時(shí)是不是多了一個(gè)主機(jī)和它下面的服務(wù)呢?那是肯定的，添加主機(jī)和服務(wù)可能出現(xiàn)的問(wèn)題有如下情況：1：配置參數(shù)出現(xiàn)問(wèn)題，如果你沒(méi)有檢查配置就啟動(dòng)nagios，可能會(huì)啟動(dòng)成功，但是顯示會(huì)不正常；解決方法：調(diào)整配置參數(shù)2：Connectionrefused當(dāng)出現(xiàn)這個(gè)問(wèn)題的時(shí)候，我開(kāi)始以為是ssh的無(wú)密碼登錄沒(méi)有成功，但是其實(shí)我的服務(wù)器沒(méi)有啟動(dòng)該服務(wù)造成的，啟動(dòng)服務(wù)即可。但是這些是有端口的服務(wù)，沒(méi)有使用端口的狀態(tài)任何檢測(cè)？使用nrpe，ok,我們現(xiàn)在在服務(wù)器上安裝nrpe：一、遠(yuǎn)程主機(jī)的配置1、安裝nrpe與配置fetch/sourceforge/nagios/nrpe-2.5.2.tar.gztarzxvfnrpe-2.5.2.tar.gzcdnrpe-2.5.2./configure--enable-ssl--enable-command-argsmakeallmkdir-p/usr/local/nagios/etcmkdir/usr/local/nagios/binmkdir/usr/local/nagios/libexecpwaddgroupnagiospwuseraddnagios-gnagios-d/usr/local/nagios/-s/sbin/nologinchown-Rnagios:nagios/usr/local/nagioscp./sample-config/nrpe.cfg/usr/local/nagios/etccpsrc/nrpe/usr/local/nagios/bin2、啟動(dòng)nrpe,端口為5666/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg-dnetstat-ant|grep5666tcp400*.5666 *.*LISTEN二、監(jiān)控服務(wù)器上的配置1、 安裝nrpe（主要是使用check_nrpe模塊）fetch/sourceforge/nagios/nrpe-2.5.2.tar.gztarzxvfnrpe-2.5.2.tar.gzcdnrpe-2.5.2./configure--enable-ssl--enable-command-argsmakeallcpsrc/check_nrpe/usr/local/nagios/libexec2、 nagios文件的配置vicheckcommands.cfg定義check_nrpe命令#'check_nrep'commanddefinitiondefinecommand{command_namecheck_nrpecommand_line/usr/local/nagios/libexec/check_nrpe-H$HOSTADDRESS$-c$ARG1$}三、上面我們已經(jīng)配置了一部分參數(shù),下面是配置的最終結(jié)果：definehost{use generic-host ;Nameofhosttemplatetousehost_nametest_nrpealias clientaddress56check_commandcheck-host-alivemax_check_attempts1check_period24x7

notification_interval120notification_period24x7notification_optionsd,rcontact_groupsadmins}#'check_load'commanddefinitiondefinecommand{command_namecheck_loadcommand_line$USER1$/check_load-w$ARG1$-c$ARG2$}#'check_load'commanddefinitiondefinecommand{command_namecheck_diskcommand_line$USER1$/check_disk-w$ARG1$-c$ARG2$}defineservice{usegeneric-service ;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionPINGis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_command}check_ping!100.0,20%!500.0,60%defineservice{usegeneric-service ;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionapacheis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,r

notification_intervalnotification_periodcheck_command96024x7check_http!100.0,20%!500.0,60%}defineservice{usegeneric-service;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionmysqlis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_command}check_mysql!100.0,20%!500.0,60%defineservice{usegeneric-service;Nameofservicetemplatetousehost_name test_nrpeservice_descriptionntpis_volatile 0check_period24x7max_check_attempts1normal_check_interval1retry_check_interval1contact_groupsadminsnotification_optionsw,u,c,rnotification_interval960notification_periodcheck_commandnotification_periodcheck_command}check_ntp!100.0,20%!500.0,60%defin