nagios 监控linux 主机

2025-01-04 技术教程

1.解决时间同步问题

当然前提是你的服务器已经安装了ntp的程序，如果没有安装可以： yum -y install ntp /usr/sbin/ntpdate pool.ntp.org

uptime

2.安装Nagios所需要的基础包

yum -y install gcc glibc glibc-common yum -y install gd gd-devdel

yum -y install openssl-devel

3.创建nagios 用户

useradd nagios

4.下载安装最新nagios插件

wget https://www.nagios-plugins.org/download/nagios-plugins-1.5.tar.gz

tar zxvf nagios-plugins-1.5.tar.gz

cd nagios-plugins-1.5

./configure --with-nagios-user=nagios --with-nagios-group=nagios

make && make install

5.更改目录权限：

chown nagios.nagios /usr/local/nagios

chown -R nagios.nagios /usr/local/nagios/libexec

6.安装nrpe插件

wget http://sourceforge.net/projects/nagios/files/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz/download

tar zxvf nrpe-2.15.tar.gz

cd nrpe-2.15

./configure

make all

make install-plugin

make install-daemon

make install-daemon-config

7.将NRPE deamon作为xinetd 下的一个服务运行

yum -y install xinetd

make install-xinetd

显示如下

可以看到创建了这个文件/etc/xinetd.d/nrpe，编辑这个脚本：

vim /etc/xinetd.d/nrpe

8.编辑/etc/services这个文件，添加nrpe服务

vim /etc/services

在最后添加如下：

#Local services

nrpe 5666/tcp #nrpe

重启xinetd的服务：

service xinetd restart

查看nrpe是否已经启动：

[root@wordpress nrpe-2.15]# netstat -at |grep nrpe

tcp 0 0 *:nrpe *:* LISTEN

[root@wordpress nrpe-2.15]# netstat -an |grep 5666

tcp 0 0 :::5666 :::* LIST

查看nrpe 是否正常工作　

/usr/local/nagios/libexec/check_nrpe -H localhost

8.查看nrpe的监控命令：

vim /usr/local/nagios/etc/nrpe.cfg

上面这5行定义的命令分别是检测登陆用户数,cpu负载,sda1的容量,僵尸进程,总进程数

9.配置监控端：

先安装openssl-devel

yum -y install openssl-devel

安装nrpe

tar -zxvf nrpe-2.8.1.tar.gz

cd nrpe-2.8.1

./configure --enable-ssl --with-ssl-lib=/usr/lib/

make all

make install-plugin

只运行之一步就行了，因为只需要check_nrpe这个插件

测试与被监控机的通信：

/usr/local/nagios/libexec/check_nrpe -H 192.168.1.243

返回nrpe的版本说明通信正常

10.在command.cfg里添加外部构件nrpe

vi /usr/local/nagios/etc/objects/commands.cfg
添加
#check nrpe
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

配置被监控主机：

vim /usr/local/nagios/etc/nagios.cfg

添加：

cfg_file=/usr/local/nagios/etc/objects/mylinux.cfg

11.配置mylinux.cfg

cd /usr/local/nagios/etc/objects/

touch mylinux.cfg

chown nagios.nagios mylinux.cfg

vim mylinux.cfg

写入如下：

define host{
use linux-server
host_name mylinux
alias mylinux
address 192.168.1.243
}
define service{
use generic-service
host_name mylinux
service_description HTTP
check_command check_http
}
define service{
use generic-service
host_name mylinux
service_description SSH
check_command check_ssh
}
define service{
use generic-service
host_name mylinux
service_description check-swap
check_command check_nrpe!check_swap
}
define service{
use generic-service
host_name mylinux
service_description check-load
check_command check_nrpe!check_load
}
define service{
use generic-service
host_name mylinux
service_description check-disk
check_command check_nrpe!check_disk
}
define service{
use generic-service
host_name mylinux
service_description check-users
check_command check_nrpe!check_users
}
define service{
use generic-service
host_name mylinux
service_description otal_procs
check_command check_nrpe!check_total_procs
}