目前越来越多的人都开始使用centos7了，就像win7超越xp一样，新技术永远是越来越让人慢慢接受的。为了快速布暑，全部使用yum安装。
环境
监控服务器：192.168.88.21
被监控客户端：192.168.88.22
关闭防火墙（全部服务器）
#systemctl stop firewalld #systemctl disable firewalld #setenforce 0 #sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/g‘ /etc/selinux/config
更新时间同步（全部服务器）
#yum install ntpdate #ntpdate cn.pool.ntp.org #echo "*/5 * * * * /usr/sbin/ntpdate cn.pool.ntp.org" >>/var/spool/cron/root
安装epel源（全部服务器）
#yum install epel-release
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服务器端安装(192.168.88.21)
#yum install mariadb-server mariadb //默认数据库 #yum install httpd php php-gd //apache+php环境 #yum install nagios nagios-plugins-all nagios-plugins-nrpe nrpe #mysql_secure_install //初始化数据库
设置nagios访问用户名和密码，使用默认nagiosadmin和默认保存位置，省心
#htpasswd -c /etc/nagios/passwd nagiosadmin 回车，设置密码
#systemctl start mariadb #systemctl start httpd #systemctl start nagios
登陆http://192.168.88.21/nagios/ 输入之前设置的用户名 nagiosadmin 及密码，就可以登入了。
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监控服务器端(192.168.88.21) 配置
添加nrpe的定义
#vi /etc/nagios/objects/commands.cfg
# ‘check_nrpe‘ command definition
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}
# ‘check_nrpe_memory‘ command definition
define command{
command_name check_nrpe_memory
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c check_mem
}
新建监控主机配置文件
#vi /etc/nagios/objects/hosts.cfg
define host{
use linux-server
host_name 192.168.88.22
alias 192.168.88.22
address 192.168.88.22
}
新建监控服务配置文件
#vi /etc/nagios/objects/services.cfg
define service {
use local-service
host_name 192.168.88.22
service_description check-host-alive
check_command check-host-alive
}
define service {
use generic-service
host_name 192.168.88.22
service_description Disk Partition
check_command check_nrpe!check_disk
}
define service {
use generic-service
host_name 192.168.88.22
service_description load
check_command check_nrpe!check_load
}
define service {
use generic-service
host_name 192.168.88.22
service_description memory
check_command check_nrpe_memory
}
define service {
use generic-service
host_name 192.168.88.22
service_description swap
check_command check_nrpe!check_swap
}
#nagios -v /etc/nagios/nagios.cfg 检测配置文件是否正确 #systemctl restart nagios 重启一下 nagios
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监控客户端安装(192.168.88.22)：
安装被监控的插件及nrpe
#yum install nagios-plugins-nrpe nrpe nagios-plugins-all
配置nrpe
#vi /etc/nagios/nrpe.cfg allowed_hosts=127.0.0.1,192.168.88.21 #允许被服务器监控 command[check_disk]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% command[check_swap]=/usr/lib64/nagios/plugins/check_swap -w 20% -c 10% command[check_iostat]=/usr/lib64/nagios/plugins/check_iostat -d sda -w 1000 -c 2000 command[check_mem]=/usr/lib64/nagios/plugins/check_mem -w 80 -c 70 #echo ‘nrpe:192.168.88.21‘ >>/etc/hosts.allow
check_iostat所需要命令
#yum install sysstat bc
check_mem和check_iostat这二个检测插件，
请看附件下载，并解压到/usr/lib64/nagios/plugins 目录下
启动nrpe
#systemctl start nrpe
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打开浏览器，查看一下，是否能正常监控到数据了：
