下载安装包

cd /opt
wget http://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
wget https://github.com/NagiosEnterprises/nrpe/archive/nrpe-3.0.tar.gz

安装依赖包

yum install -y gcc glibc make cmake glibc-common gd gd-devel php perl-devel mysql-server

编译安装nagios-plugins

cd /opt/nagios-plugins-2.1.2
./configure --prefix=/usr/local/nagios
make && make install && echo $?

编译安装nrpe

cd /opt/nrpe-3.2.1
./configure --prefix=/usr/local/nagios --enable-command-args
make all
#添加nagios用户
make install-groups-users
#安装
make install
#添加主配置文件
make install-config
#配置xinetd
make install-inetd
#设置nrpe管理命令
make install-init
#编译插件
make check_nrpe
#安装插件
make install-plugin

配置

#先备份
cp /usr/local/nagios/etc/nrpe.cfg{,.bak}
#修改配置文件
vim /usr/local/nagios/etc/nrpe.cfg
#将hda1改为sda1

command[check_sda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda1

启动nrpe

/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

服务器端

#生成配置文件（建议cp原因的配置文件进行修改）（这里以test命名，建议用主机名命名）
cd /usr/local/nagios/etc/servers/
vim test.cfg

#
# HOST  DEFINITION
#
define host{
        use                     linux-server            ; Name of host template to use
                                                        ; This host definition will inherit all variables that are defined
                                                        ; in (or inherited by) the linux-server host template definition.
        host_name               test #客户端主机名
        alias                   test
        address                 客户端IP地址
        }
#
# HOST GROUP DEFINITION
#               
define hostgroup{
        hostgroup_name  test; The name of the hostgroup
        alias           test; Long name of the group
        members         test     ; Comma separated list of hosts that belong to this group
        }
#
# service DEFINITION
#                   
define service{
        use                             local-service         ; Name of service template to use
        host_name                       test
        service_description             Root Partition
        check_command                   check_local_disk!20%!10%!/
        }               
define service{
        use                             local-service         ; Name of service template to use
        host_name                       study
        service_description             Root Partition
        check_command                   check_local_disk!20%!10%!/
        }                   
            ......

重新读取配置文件

systemctl reload nagios

notifications_enabled

notifications_enabled允许报警，1表示允许，0表示不允许
在nagios中enable_notifications=1定义了默认允许发送报警信息
notifications_enabled是在定义主机配置中对某个服务的定义，如

define service{
use                                      local-service         ; Name of service template to use
host_name                          test
service_description             HTTP
check_command                 check_http
notifications_enabled           1
}