本帖最后由monicazhang于2015-10-3021:40编辑
definehost{ usehost-pnp host_namenagios-test1 aliasnagiostest1 address172.26.188.202 contact_groupsadmins check_commandcheck-host-alive max_check_attempts5 notification_interval10 notification_period24x7 notification_optionsd,u,r } 修改services.cfgservices.cfg定义被监控机的监控项，配置如下： defineservice{ usesrv-pnp host_namenagios-test1 service_descriptioncheck_tcp80 check_period24x7 max_check_attempts4 normal_check_interval3 retry_check_interval2 contact_groupsadmins notification_interval10 notification_period24x7 notification_optionsw,u,c,r event_handler_enabled1 event_handlerrestart-httpd check_commandcheck_tcp!80nagios安装 } 被监控机配置被监控机安装plugin#groupaddnagios #useradd-gnagios-d/usr/local/nagiosnagios #tar–zxvfnagios-plugins-1.4.16.tar.gz #cdnagios-plugins-1.4.16 #./configure--with-nagios-user=nagios--with-nagios-group=nagios #make #makeinstall 被监控机安装nrpe#tar-zxvfnrpe-2.13.tar.gz #cdnrpe-2.13 #./configure--prefix=/usr/local/nagios #makeall #makeinstall-plugin #makeinstall-daemon #makeinstall-daemon-config #chown-Rnagios:nagios/usr/local/nagios
将nrpe加入xinetd启动 #vi/etc/xinetd.d/nrpe servicenrpe { flags=REUSE socket_type=stream port=5666 wait=no user=nagios group=nagios server=/usr/local/nagios/bin/nrpe server_args=-c/usr/local/nagios/etc/nrpe.cfg--inetd开源监控软件 log_on_failure+=USERID disable=no only_from=127.0.0.1172.26.188.201 }
在/etc/services对应位置加入如下行： nrpe5666/tcp#NRPE
启动nrpe servicexinetdrestart 配置被监控机主要修改了以下这几个文件 /usr/local/nagios/etc/nrpe.cfg /etc/hosts.allow /etc/rc.local 1)配置NRPE 首先查看/usr/local/nagios/libexec文件夹下面是否有监控脚本命令，这些脚本既为nrpe.cfg中定义命令需要调用的脚本 vi/usr/local/nagios/etc/nrpe.cfg allowed_hosts=172.26.188.201#监控机IP server_address=172.26.188.202#本机IP 在nrpe.cfg中添加自定义的命令 以下条命令为例 Command[check_sdb2]=/usr/local/nagios/libexec/check_disk–w20%-c10%-p/dev/sdb2 监测硬盘使用量，check_sdb2为自定义名，check_disk为调用的脚本，-w是警告，剩余20%容量时，-c，10%为严重值，-p指定要监控的硬盘 2)修改/etc/hosts.allow增加监控机ip echo'nrpe:监控机ip'>>/etc/hosts.allow 3)启动NRPE守护进程： /usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg–d 4)设置开机自动启动NRPE。 echo"/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg-d">>/etc/rc.local 查看相应的端口：netstat-an|grep5666 你会发现5666端口已开启。
要点：在添加被监控机时，首先要确定被监控机nrpe.cfg文件里有添加此命令行，前提是在被监控机的/usr/local/nagios/libexec文件夹下面有相应的监控命令的脚本；其次在监控机的command.cfg文件配置里也要有相应的配置，既依照文件里面nrpe的定义文件来添加相应的监控命令；最后是监控机的services.cfg文件中定义具体的监控项。 nagios事件自动处理nagios通过SSH执行event_handernagios使用eventhandlers来在任何人收到通知之前由Nagios做一些前期故障修复。nagios配置 事件处理命令可以用shell或是perl脚本，脚本中应该处理以下宏：
对服务的：$SERVICESTATE$、$SERVICESTATETYPE$和$SERVICEATTEMPT$；
对主机的：$HOSTSTATE$、$HOSTSTATETYPE$和$HOSTATTEMPT$。
脚本须检测这些作为命令行参数传入的值，并采取必要动作来处理这些值。 下面以nagios监控apache服务，当apache停止时自动启动apache。详细配置步骤如下: 1)配置在Nagios监控机上无密码登录远程被监控机 Ø生成ssh密钥文件 #su-nagios $ssh-keygen-trsa #下面一直回车，不要设置密码 Generatingpublic/privatersakeypair. Enterfileinwhichtosavethekey(/home/nagios/.ssh/id_rsa): Enterpassphrase(emptyfornopassphrase): Entersamepassphraseagain: Youridentificationhasbeensavedin/home/nagios/.ssh/id_rsa. Yourpublickeyhasbeensavedin/home/nagios/.ssh/id_rsa.pub. Thekeyfingerprintis: Ø将生成的密钥拷贝到要远程被监控主机上 $scp.ssh/id_rsa.pubnagios-test1:/usr/local/nagios/ Ø在要远程登录的被监控机器上配置公钥 $sshnagios@nagios-test1 $nagios@nagios-test1'spassword: $catid_rsa.pub>>.ssh/authorized_keys $chmod600.ssh/authorized_keys监控软件 $exit Ø测试无密码登录 $sshnagios@nagios-test1 2)在远程被监控机器上配置sudo 使nagios用户可以以root身份运行/usr/local/nagios/libexec/eventhandlers/restart-httpd脚本 #visudo 添加如下行： nagiosALL=(root)NOPASSWD:/usr/local/nagios/libexec/eventhandlers/restart-httpd 注释如下行： #Defaultsrequiretty 3)在远程机器上编写apache重启脚本
vi/usr/local/nagios/libexec/eventhandlers/restart-httpd 内容如下: #!/bin/sh # #EventhandlerscriptforrestartingtheApacheserverontheremotemachine # #Note:ThisscriptwillonlyrestarttheApacheserveriftheserviceis #retried2times(ina"soft"state)orifthewebservicesomehow #managestofallintoa"hard"errorstate. # # #WhatstateistheApacheservicein?nagios实施 case"$1"in OK) ;; WARNING) ;; UNKNOWN) ;; CRITICAL) #Isthisa"soft"ora"hard"state? case"$2"in SOFT) #Whatcheckattemptareweon?Wedon'twanttorestarttheApacheserveronthefirst #check,becauseitmayjustbeafluke!nagios培训 case"$3"in 2)
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