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1. Install Nagios on Centos 5


By Fabio Milano


Installing Nagios server and network monitoring on Centos 5 server
The official documentation can be found at http://support.nagios.com/knowledge-...-documentation
Install necessary packages

Mã:

yum install httpd gcc glibc glibc-common gd gd-devel php

Create Nagios User account and group

Mã:

useradd -m nagios

Create nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user

Mã:

groupadd nagcmd usermod -a -G nagcmd nagios usermod -a -G nagcmd apache

Create Directory to store Nagios installation files

Mã:

mkdir /opt/Nagios

Download Nagios and Plugins

Save file to directory /opt/Nagios
http://www.nagios.org/download/download.php
As of this writing Nagios 3.0.6 (Stable) and Nagios Plugins 1.4.13 (Stable)
Extract Files:

Mã:

cd /opt/Nagios tar xzf nagios-3.0.6.tar.gz cd nagios-3.0.6

Compile and Configure Nagios

Mã:

./configure --with-command-group=nagcmd

Compile Nagios:

Mã:

make all

Compile binaries, init script, sample config files:

Mã:

make install make install-init make install-config make install-commandmode

** Do Not Start Nagios **

Nagios has now been installed to the directory /usr/local/nagios/
Install Nagios Web Interface:

Mã:

make install-webconf

Nagios Web Interface installed to /usr/local/nagios/share ( http conf file added to /etc/httpd/conf.d/nagios.conf )
Create Web Interface Login User:
** This is not the most secure method **
We will create user “nagiosadmin” ( remember the password you assign !)

Mã:

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin Restart Apache: service httpd restart

Install Nagios Plugins

Extract Files:

Mã:

cd /opt/Nagios tar xzf nagios-plugins-1.4.13.tar.gz cd nagios-plugins1.4.13

Compile and Configure Nagios Plugins

Mã:

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

Configure nagiosadmin email address for alerts

Mã:

vi /usr/local/nagios/etc/objects/contacts.cfg email nagios@localhost ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******

Verify the sample Nagios configuration files

Mã:

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg Total Warnings: 0 Total Errors: 0

Start Nagios

Mã:

Enable Nagios to start at system startup / boot chkconfig --add nagios chkconfig nagios on chkconfig httpd on Start Nagios service nagios start

Log into Web Interface

Mã:

http://ip-address/nagios/

2. Nagios NRPE add Services to Monitor


Scenario / Question:

I followed the Tutorial on installing and configuring NRPE, but now I want to monitor more services on the remote server.

Solution / Answer:

You can add services by configuring nrpe.cfg on the remote host and adding a new service definition on the Nagios monitoring server.
Download Service Plugin on Remote Host Server

1. Download the plugin to folder /usr/local/nagios/libexec/
2. Change permissions on plugin to nagios

Mã:

# cd /usr/local/nagios/libexec/ # chown nagios.nagios check_something # chmod 775 check_something 3. Test the plugin works # /usr/local/nagios/libexec/check_something

Edit nrpe.cfg File on Remote Host Server

Add a new command definition to the nrpe.cfg file on the remote host

Mã:

# vi /usr/local/nagios/etc/nrpe.cfg

Add a new check_something command definition. (replace “check_something” with the actual plugin file name). Also you must define any arguments. Do a “check_something -h” for a plugins arguments.

Mã:

command[check_something]=/usr/local/nagios/libexec/check_something -t 20 -c 30

Because we are running xinetd we do not need to restart the NRPE daemon. Otherwise you would have to restart the NRPE daemon for the changes to take effect.
Add Service Definition to Nagios Monitoring Server


On the monitoring host, you need to define a new service for check_something on the remote host. Add
the following entry to one of your object configuration files (linux-server-remote.cfg)
define service{
use generic-service
host_name remotehost
service_description Check Something
check_command check_nrpe!check_something
}


Next, verify your Nagios configuration files and restart Nagios.

Mã:

# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg # service nagios restart

Bonus 1: Tôi muốn cài đặt 1 server Nagios để giám xác các dịch vụ (HTTP, SSH, SMTP, POP3,IMAP...Server Windows or Linux từ xa) thì tôi làm như sau:

1. Trên Server cần giám xác(Do nothing)

2. Trên Server Nagios tôi cài đặt Nagios, Nagios_Pluins, NRPE (3 thành phần này phải được cài trên server Nagios)

3. Và làm theo hướng dẫn theo tài liệu của Nagios

Trích dẫn:

http://nagios.sourceforge.net/docs/3...cservices.html

Bonus 2: Tôi muốn cài đặt 1 server Nagios để giám xác (RAM, CPU load, HDD trên ....Server Windows or Linux từ xa) thì tôi làm như sau:

Trích dẫn:

http://www.kernelhardware.org/nagios...-linux-server/

Bài viết được tổng hợp từ nhiều nguồn: nagios, kernalhardware.


Các links liên quan:

http://www.kernelhardware.org/nagios...es-to-monitor/


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