First of all we have to install SNMP service.

[root@p-root /opt]# rpm -qa | grep snmp

[root@p-root /opt]# yum install net-snmp net-snmp-utils

[root@p-root /opt]# service snmpd start

[root@p-root /opt]# chkconfig –add snmpd

[root@p-root /opt]# chkconfig –levels 2345 snmpd on

Run this command,whether is’t working or not,if you get the below output means it’s working:

[root@p-root /opt]# snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex

IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1

IP-MIB::ipAdEntIfIndex.192.168.0.128 = INTEGER: 2

Now configure snmpd.conf file. Please take backup of default snmpd.conf file and create new one.

[root@p-root /opt]# mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.bak

[root@p-root /opt]# vi /etc/snmp/snmpd.conf

Replace the content in there with following:-

com2sec local localhost public
com2sec mynetwork 192.168.0.0/24 public
group MyRWGroup v1 local
group MyRWGroup v2c local
group MyRWGroup usm local
group MyROGroup v1 mynetwork
group MyROGroup v2c mynetwork
group MyROGroup usm mynetwork
view all included .1 80
access MyROGroup “” any noauth exact all none none
access MyRWGroup “” any noauth exact all all none
syslocation “Some place out there”
syscontact Admin <admin@unixsurgeon.com>

Here i am sharing my configuration file  :-

##########################################################

#

# snmpd.conf

#

# – created by the snmpconf configuration program

#

##########################################################

# SECTION: Access Control Setup

#

# This section defines who is allowed to talk to your running

# snmp agent.

# rocommunity: a SNMPv1/SNMPv2c read-only access community name

# arguments: community [default|hostname|network/bits] [oid]

com2sec local localhost private

com2sec mynetwork 192.168.0.0/24 public

com2sec mynetwork 115.110.x.x/32 public

group MyRWGroup v1 local

group MyRWGroup v2c local

group MyRWGroup usm local

group MyROGroup v1 mynetwork

group MyROGroup v2c mynetwork

group MyROGroup usm mynetwork

view     all        included         .1         80

access MyROGroup  ” “  any noauth exact all none none

access MyRWGroup  ” “  any noauth exact all all none

syslocation Linux (RH3_UP2), Linux Router.

[root@p-root /opt]# service snmpd restart

Now test your SNMP server.

[root@p-root /opt]# snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex

IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1

IP-MIB::ipAdEntIfIndex.192.168.0.128 = INTEGER: 2

Ok. That is all we will do with SNMP. Let us continue MRTG installation.

[root@p-root /opt]# rpm -qa | grep mrtg

[root@p-root /opt]# yum install mrtg

Let us set up data directory to store html files:

[root@p-root /opt]# mkdir /var/www/html/mrtg

Now let us set up mrtg.conf to use for monitoring bandwidth usage:

[root@p-root /opt]# cfgmaker public@192.168.0.128 –global “WorkDir: /var/www/html/mrtg” –output=/etc/mrtg/mrtg.cfg

Let us create index file for MRTG page:

[root@p-root /opt]# indexmaker –output=/var/www/html/mrtg/index.html /etc/mrtg/mrtg.cfg

It is time for us to tell Apache to serve these pages

[root@p-root /opt]# vi /usr/local/apache2/conf/httpd.conf

Alias /mrtg /var/www/html/mrtg
<location /mrtg>
Order deny,allow
Deny from all
Allow from 127.0.0.1 192.168.0.0/24
</location>

[root@p-root /opt]# snmpwalk -v 1 -c public 192.168.0.128 interface

[root@p-root /opt]# env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg

[root@p-root /opt]# crontab -e

*/5 * * * * /usr/bin/mrtg /etc/mrtg/mrtg.cfg –logging /var/log/mrtg.log

Open this link in your browser and it will show like this.

http://192.168.0.128/mrtg

Protect your MRTG graphs with password protected directory :-

To restrict access to your MRTG reports. This can easily accomplished with Apache webserver’s .htaccess file.

Below is process to protect graphs using apache’s .htaccess file and htpasswd command:

Step # 1: Create .htaccess file in /var/www/html/mymrtg/ directory (add text as follows):

[root@p-root /]# vi /var/www/html/mymrtg/.htaccess

Then Add following text to file:-

AuthName “MRTG Graphs Restricted Access”
AuthType Basic
AuthUserFile /var/members/.htpasswd
require user unixsurgeon

Step # 2: Create a user and password name (-c assumes first time you are using .htpasswd file):-

[root@p-root /]# htpasswd -c /var/members/.htpasswd unixsurgeon

=============================================================================================

Enjoy Linux !!!

ZABBIX is software that monitors numerous parameters of a network and the health and integrity of servers. ZABBIX uses a flexible notification mechanism that allows users to configure e-mail based alerts for virtually any event. This allows a fast reaction to server problems. ZABBIX offers excellent reporting and data visualisation features based on the stored data. This makes ZABBIX ideal for capacity planning.

ZABBIX supports both polling and trapping. All ZABBIX reports and statistics, as well as configuration parameters are accessed through a web-based front end. A web-based front end ensures that the status of your network and the health of your servers can be assessed from any location. Properly configured, ZABBIX can play an important role in monitoring IT infrastructure. This is equally true for small organisations with a few servers and for large companies with a multitude of servers.

Setup Zabbix with mysql support only in 15 minutes.

Step 1 :-

Install Apache and MSSQL server through Yum :-

# yum install mysql-server httpd

# service mysqld start

# service httpd start

Set Mysql root password (Default root password is null)

# mysqladmin –u root password NEWPASSWORD

Step 2 :-

Install Zabbix server , web, agent packages through yum repository.

# yum install zabbix (It will install zabbix,zabbix-web-mysql.noarch,zabbix-agent & zabbix-server)

# cd /usr/share/doc/zabbix

# mysql -uroot -p password

mysql > create database zabbix;

mysql > quit;

# cd create/schema

# cat mysql.sql | mysql -u root -p password  zabbix

# cd ../data

# cat data.sql | mysql -u root -p password  zabbix

# cat images_mysql.sql | mysql -u root -p password  zabbix

Edit the below mentioned files

Configure /etc/zabbix/zabbix_agent.conf

Configure /etc/zabbix/zabbix_agentd.conf

Configure /etc/zabbix/zabbix_server.conf

# service zabbix-server start

# service zabbix-agent start

# service httpd restart

Step 3 :-

Go to web interface and  http://localhost/zabbix or http://ipaddress/zabbix

And follow the instructions mentioned there

Zabbix frontend is ready! Default user name is Admin, password null.

Step 2

Read and accept GPL v2.

Step 3

Make sure that all software pre-requisites are met.

Step 4

Configure database settings. Zabbix database must already be created.

Step 5

Enter Zabbix Server details.

Step 6

See summary of settings.

Step 7

Download configuration file and place it under conf/.

Step 8

Finishing installation.

Step 9

For distributed monitoring only!

If used in a distributed environment you have to run:

shell> ./zabbix_server –n <nodeid>

where Node ID is an unique Node identificator. For example:

shell> ./zabbix_server –n 1

This will convert database data for use with Node ID ‘1′ and also adds a local node.

Step 10

Zabbix frontend is ready! Default user name is Admin, password null/blank.

Enjoy Linux…!!!

Today I was hunting about monitoring tool in linux and found lots of monitoring tools (i.e. Nagios, openNMS, Cacti,Centreon etc..) And I try to install nagios. You can also install nagios by following steps :-

Prerequisites:

1. Apache
2. PHP
3. GCC compiler
4. GD development libraries
5. PERL Modules
6. RRDTOOL

And you can install these packages through yum:-

[root@p-root]# yum install httpd

[root@p-root]# yum install php php-mysql php-gd php-ldap php-xml

[root@p-root]# yum install gd gd-devel

[root@p-root]# yum install gcc glibc glibc-common libstdc++-devel gcc-c++

[root@p-root]# yum install install perl-DBI perl-DBD-MySQL

[root@p-root]# yum install install perl-Config-IniFiles

[root@p-root]# yum install install rrdtool perl-rrdtool

Now create new nagios user account and give it password….

[root@p-root]# useradd nagios

[root@p-root]# passwd nagios

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

[root@p-root]# groupadd nagcmd

[root@p-root]# usermod –a –G nagcmd nagios

[root@p-root]# usermod –a –G nagcmd apache

Now download Nagios and Nagios-Plugins :-

[root@p-root]# wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.1.tar.gz

[root@p-root]# wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.11.tar.gz

[root@p-root]# tar –zxvf nagios-3.2.1.tar.gz

[root@p-root]# cd nagios-3.2.1

[root@p-root]# ./configure – -with-command-group=nagcmd

[root@p-root]# make all

[root@p-root]# make install

[root@p-root]# make install-init

[root@p-root]# make install-config

[root@p-root]# make install-commandmode

[root@p-root]# make install-webconf

(it will create nagios web config file in apache conf.d direcotry)
Now create nagiosadmin account for nagios web interface.

[root@p-root]# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Password:

[root@p-root]# /etc/init.d/httpd restart

Now install nagios-plugin.

[root@p-root]# tar –zxvf nagios-plugins-1.4.11.tar.gz

[root@p-root]# cd nagios-plugins-1.4.11

[root@p-root]# ./configure –with-nagios-user=nagios –with-nagio-group=nagios

[root@p-root]# make

[root@p-root]# make install

Now you have installed all the required packages and services.
Now start nagios.

[root@p-root]# chkconfig –add nagios

[root@p-root]# chkconfig nagios on

Verify your nagios config file.

[root@p-root]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

If there is no error it means your nagios configuration is correct and you can start nagios service.

[root@p-root]# /etc/init.d/nagios start

Now access your nagios web interface :-

http://localhost/nagios

==============================================

NRPE Installation and Setup:-

Download and Install NRPE

You may download nrpe from http://www.nagios.org/download/download.php

[root@p-root~]# wget http://prdownloads.sourceforge.net/sourceforge/nagios/nrpe-2.12.tar.gz

Extract the Files:

[root@p-root~]# tar -xzf nrpe-2.12.tar.gz
[root@p-root~]# cd nrpe-2.12

Compile and Configure NRPE

You need the openssl-devel package installed to compile NRPE with ssl support. So make sure that open ssl is already installed on the server.

Install NRPE:

[root@p-root~]# ./configure

General Options:

————————-
NRPE port: 5666
NRPE user: nagios
NRPE group: nagios
Nagios user: nagios
Nagios group: nagios

[root@p-root~]# make all

[root@p-root~]# make install-plugin

[root@p-root~]# make install-daemon

[root@p-root~]# make install-daemon-config

[root@p-root~]# make install-xinetd

Post NRPE Configuration

Edit Xinetd NRPE entry:

Add Nagios Monitoring server to the “only_from” directive

[root@p-root~]# vi /etc/xinetd.d/nrpe

Entry will be like this:-

service nrpe
{
flags = REUSE
socket_type = stream
port = 5666
wait = no
user = nagios
group = nagios
server = /usr/local/nagios/bin/nrpe
server_args = -c /etc/nrpe.conf –inetd
log_on_failure += USERID
disable = no
# only_from = 127.0.0.1
}

only_from = 127.0.0.1

Edit services file entry:

Add entry for nrpe daemon

[root@p-root~]# vi /etc/services

nrpe 5666/tcp # NRPE

Restart Xinetd and Set to start at boot:

[root@p-root~]# chkconfig xinetd on

[root@p-root~]# service xinetd restart

Test NRPE Daemon Install

Check NRPE daemon is running and listening on port 5666:

[root@p-root~]# netstat -at |grep nrpe

Output should be:-

tcp 0 0 *:nrpe *.* LISTEN

or

[root@p-root]# netstat -plan | grep 5666

tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 15721/xinetd

Check NRPE daemon is functioning:

[root@p-root]# /usr/local/nagios/libexec/check_nrpe -H localhost

Output should be NRPE version:

NRPE v2.12

======================================================================

Enjoy Linux !!!