一、服务端配置：

  1. 安装软件：
yum  -y  install  nagios  nagios-plugins  nagios-plugins-all  nagios-plugins-nrpe  nrpe
  1. 修改nagios主配置文件：vim /etc/nagios/nagios.cfg
cfg_dir=/etc/nagios/conf.d  #确保其中有这行代码

3. 修改cgi配置文件，添加用户：vim /etc/nagios/cgi.cfg

authorized_for_system_information=nagiosadmin,lee
authorized_for_configuration_information=nagiosadmin,lee
authorized_for_system_commands=nagiosadmin,lee
authorized_for_all_services=nagiosadmin,lee
authorized_for_all_hosts=nagiosadmin,lee
authorized_for_all_service_commands=nagiosadmin,lee
authorized_for_all_host_commands=nagiosadmin,lee

4. 修改命令配置文件command.cfg：vim /etc/nagios/objects/commands.cfg

#添加
define command{
    command_name  check_nrpe
    command_line  $USER1/check_nrpe  -H  $HOSTADDRESS  -c  $ARG1
}

5. 修改联系人配置文件：vim /etc/nagios/objects/contacts.cfg

define contact{
        contact_name                    nagiosadmin		
	use				generic-contact		
        alias                           Nagios Admin		
        email                           complet@163.com
        }
define contactgroup{
        contactgroup_name       admins
        alias                   Nagios Administrators
        members                 nagiosadmin
        }
  1. 添加远程主机的监控指令（可以用本地配置文件/etc/nagios/objects/localhost.cfg作为模板）： cp -arf /etc/nagios/objects/localhost.cfg /etc/nagios/conf.d/lee.cfg vim /etc/nagios/conf.d/lee.cfg
define host{
        use                     linux-server            
        host_name               lee
        alias                   lee
        address                 192.168.8.82
        }
#去掉这组定义
#define hostgroup{
#        hostgroup_name  linux-servers 
#        alias           Linux Servers 
#        members         lee     
#        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             PING
	check_command			check_ping!100.0,20%!500.0,60%
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             Root Partition
	check_command			check_local_disk!20%!10%!/
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             Current Users
	check_command			check_local_users!20!50
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             Total Processes
	check_command			check_local_procs!250!400!RSZDT
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             Current Load
	check_command			check_local_load!5.0,4.0,3.0!10.0,6.0,4.0
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             Swap Usage
	check_command			check_local_swap!20!10
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             SSH
	check_command			check_ssh
	notifications_enabled		0
        }
define service{
        use                             local-service         
        host_name                       lee
        service_description             HTTP
	check_command			check_http
	notifications_enabled		0
        }
  1. 检查配置文件语法：
nagios -v /etc/nagios/nagios.cfg
  1. 修改nagios相关目录权限：
chown  nagios.nagios  /etc/logrotate.d/nagios
chmod  g+w  /etc/logrotate.d/nagios
chown  -R  nagios.nagios  /etc/nagios
  1. 设置apache账户密码：
htpasswd  -c  /etc/nagios/passwd  lee
  1. 启动服务：
systemctl  start  httpd
systemctl  start  nagios

二、客户端配置：

  1. 安装软件：
yum  -y  install  nagios-plugins  nagios-plugins-nrpe  nrpe
  1. 修改 nrpe 主配置文件：vim /etc/nagios/nrpe.cfg
#添加服务端ip
allowed_hosts=127.0.0.1,192.168.8.81

3. 启动nrpe服务：

systemctl  start  nrpe

三、测试：