nagios 监控linux 主机
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
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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
http://blog.运维网.com/attachment/201311/150758110.jpg
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
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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：
# netstat -at |grep nrpe
tcp 0 0 *:nrpe *:* LISTEN
# 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
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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_descriptionotal_procs
check_command check_nrpe!check_total_procs
}
检查配置文件是否错误：
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
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12.重启nagios: service nagios restart
13.查看web
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完成！
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