一、安装环境

        1.Centos6.8

        2.关闭iptables防火墙

二、安装nagios服务器端：

        1. rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

        2. yum -y install nagios nagios-plugins-all nagios-plugins-nrpe nrpe php

        3. chkconfig httpd on && chkconfig nagios on

        4. service httpd start && service nagios start

        5. 设置nagiosadmin密码： htpasswd -c /etc/nagios/htpasswd.users nagiosadmin

        6. 登陆： http://{your_ip_address}/nagios 输入密码

三、安装pnp4nagios：

         1. yum install pnp4nagios rrdtool

四、配置pnp4nagios：

        1.修改nagios.cfg

    [root@localhost objects]# vim /etc/nagios/nagios.cfg    //修改以下内容      process_performance_data=1                             //由0改为1      host_perfdata_command=process-host-perfdata            //前面的注释拿掉      service_perfdata_command=process-service-perfdata      //注释拿掉      enable_environment_macros=1                            //如果有注释拿掉

        2，修改commands.cfg

        注释掉原有对process-host-perfdata和process-service-perfdata，重新定义

        vim /etc/nagios/objects/commands.cfg

        define command{

            command_name    process-host-perfdata            command_line    /usr/libexec/pnp4nagios/process_perfdata.pl -d HOSTPERFDATA            }

        define command{

            command_name    process-service-perfdata            command_line    /usr/libexec/pnp4nagios/process_perfdata.pl            }

       3.修改配置文件templates.cfg 

        vim /etc/nagios/objects/templates.cfg

        define host{

            name                    hosts-pnp            register                0            action_url  /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_            process_perf_data            }

        define service{

            name    srv-pnp            register   0            action_url  /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$            process_perf_data            }

        4，修改服务器配置文件localhost.cfg

        vim /etc/nagios/objects/localhost.cfg

        define host{

            use                     linux-server,hosts-pnp     #添加红色字体            host_name               localhost            alias                   localhost            address                 127.0.0.1            }

        define service{

            use                             local-service,srv-pnp     #添加红色字体            host_name                       localhost            service_description             PING            check_command                   check_ping!100.0,20%!500.0,60%            }

         5，重启nagios，启动npcd

    

             /etc/init.d/npcd restart  

             /etc/init.d/nagios restart 

六。 配置调试命令

       /usr/sbin/nagios -v /etc/nagios/nagios.cfg

    [root@bogon ~]# /usr/sbin/nagios -v /etc/nagios/nagios.cfg

    Nagios Core 3.5.1

    Copyright (c) 2009-2011 Nagios Core Development Team and Community Contributors    Copyright (c) 1999-2009 Ethan Galstad    Last Modified: 08-30-2013    License: GPL

    Website: http://www.nagios.org

    Reading configuration data...    Read main config file okay...    Processing object config file '/etc/nagios/objects/commands.cfg'...    Processing object config file '/etc/nagios/objects/contacts.cfg'...    Processing object config file '/etc/nagios/objects/timeperiods.cfg'...    Processing object config file '/etc/nagios/objects/templates.cfg'...    Processing object config file '/etc/nagios/objects/localhost.cfg'...    Processing object config file '/etc/nagios/objects/switch.cfg'...    Processing object config directory '/etc/nagios/conf.d'...    Read object config files okay...

    Running pre-flight check on configuration data...

    Checking services...

    Checked 16 services.    Checking hosts...    Checked 3 hosts.    Checking host groups...    Checked 2 host groups.    Checking service groups...    Checked 0 service groups.    Checking contacts...    Checked 1 contacts.    Checking contact groups...    Checked 1 contact groups.    Checking service escalations...    Checked 0 service escalations.    Checking service dependencies...    Checked 0 service dependencies.    Checking host escalations...    Checked 0 host escalations.    Checking host dependencies...    Checked 0 host dependencies.    Checking commands...    Checked 25 commands.    Checking time periods...    Checked 5 time periods.    Checking for circular paths between hosts...    Checking for circular host and service dependencies...    Checking global event handlers...    Checking obsessive compulsive processor commands...    Checking misc settings...

    Total Warnings: 0

    Total Errors:   0

    Things look okay - No serious problems were detected during the pre-flight check

    

七、问题总结

        1.安装过程很顺利，但是在配置完成后，重启nagios服务时出现报错，大概意思就是配置文件错误，请检查配置文件（Invalid object definition type ' host' in file '/etc/nagios/objects/template）。使用 /usr/sbin/nagios -v /etc/nagios/nagios.cfg命令检查，发现templates.cfg 文件配置错误，后来一直检查也没发现问题，最后发现问题出在字体格式上面，因为我是直接从网页上复制黏贴的，服务器可能无法识别字体或者特殊符号（手动敲一遍，问题解决。。。汗）

        

        2.nagios重启完成后，登录网页，可以看到如下图所示，点击网络表格的图表，没有弹出页面图表，报错信息如下："/var/lib/pnp4nagios/localhost" for host "localhost" does not exist，将commands.cfg更改为上面的内容后，重启nagios恢复正常（我出错之前的配置并不是这样的），重启完要等一会才能看到图的。

        

        

        3.将服务迁移到生产机器时（之前是在测试机上进行测试的），发现配置完成后，打开网页，点击图标图标时，弹出的页面提示：The requested URL /pnp4nagios/index.php/graph was not found on this server.提示页面无法找到。

解决方法：打开vim /etc/httpd/conf.d/pnp4nagios.conf，将里面的代码完全拷贝，打开vim /etc/httpd/conf/httpd.conf，将拷贝的代码粘贴到文件的最下方，然后重启nagios和apache服务。

        [root@m ~]# service nagios restart

        [root@m ~]# service httpd restart

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