How to install Nagios in ubuntu10.04/10.10 (how to install Nagios)

I-install Apache, PHP and some needed Libraries

First we will install Apache, PHP and needed librairies

• Install some necessary compilers using the command:

sudo  apt-get install build-essential

• Install GD libraries using the command:

sudo apt-get install libgd2-xpm-dev

• Install apache2

sudo apt-get install apache2

• Install PHP for Apache 2:

sudo apt-get install php5-common php5 libapache2-mod-php5

Now configure Apache to use PHP:

Open apache2.conf File

sudo vi   /etc/apache2/apache2.conf 

And add this line

DirectoryIndex index.html index.php index.cgi

Now restart your Apache

sudo  /etc/init.d/apache2   restart

II-install and configure Nagios:

Now lets install and configure Nagios

First download the latest Core Nagios from Nagios website and before installing create a user to run the service and a group to run external commands:

 * sudo useradd -m nagios * sudo passwd nagios * sudo groupadd nagcmd * sudo usermod -a -G nagcmd nagios * sudo usermod -a -G nagcmd www-data

Now install the Nagios tarbils that were downloaded previusly:

tar -zxvf nagios-3.2.1.tar.gz 

Then CD the extracted folder and install

cd nagios-3.2.1sudo ./configure --with-command-group=nagcmdsudo make allsudo make installsudo make install-initsudo make install-configsudo make install-commandmodesudo make install-webconf

Add a user for the Nagios interface:

sudo  mkdir  /usr/local/nagios/etc

Create a new password

sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Output

New password:
Re-type new password:
Pirat9 @ pirat9-desktop :~ /Downloads/nagios-3.2.1 $

Now add Nagios directory to Apache, first open Apache. conf:

sudo vi /etc/apache2/apache.conf

And add these lines:

 

ScriptAlias/Nagios/cgi-bin/usr/local/Nagios/sbin

<Directory "/usr/local/Nagios/sbin">

Options execcgi

AllowOverride none

Order allow, deny

Allow from all

Authtype basic

Authuserfile/usr/local/Nagios/etc/htpasswd. Users

Require valid-user

</Directory>

Alias/Nagios/usr/local/Nagios/share

<Directory "/usr/local/Nagios/share">

Options none

AllowOverride none

Order allow, deny

Allow from all

Authtype basic

Authuserfile/usr/local/Nagios/etc/htpasswd. Users

Require valid-user

</Directory>

 

Save and exit then restart apache2

sudo  /etc/init.d/apache2 restart

Install Nagios plugins:

• Now we have to install Nagios plugins, first download the file from Nagios website, then extract it using the command:

tar -zxvf  nagios-plugins-1.4.14.tar.gz 

• CD the extracted folder and install the plugins

 cd nagios-plugins-1.4.14 sudo ./configure --with-nagios-user=nagios --with-nagios-group=nagiossudo make sudo make install

• Create a link to start the service:

sudo ln -s /etc/init.d/nagios /etc/rcS.d/S99nagiosls -altr

Output

Total 20

-RW-r-1 Root 447 readme

Lrwxrwxrwx 1 Root 20 2010-04-04 S70x11-common-> ../init. d/x11-common

Lrwxrwxrwx 1 Root 24 2010-04-04 S70screen-cleanup-> ../init. d/screen-cleanup

Lrwxrwxrwx 1 Root 17 2010-04-04 s55urandom-> ../init. d/urandom

Lrwxrwxrwx 1 Root 23 2010-04-04 S49console-setup->.../init. d/console-Setup

Lrwxrwxrwx 1 Root 18 2010-04-04 s37apparmor->.../init. d/apparmor

Lrwxrwxrwx 1 Root 16 2010-04-04 s25brltty->.../init. d/brltty

Lrwxrwxrwx 1 Root 21 2010-04-04 s13pcmciautils->.../init. d/pcmciautils

Lrwxrwxrwx 1 Root 24 2010-04-04 S06keyboard-setup-> ../init. d/keyboard-Setup

Drwxr-XR-x 132 Root 12288 2010-04-15 ..

Lrwxrwxrwx 1 Root 18 2010-04-15 s99nagios->/etc/init. d/Nagios

Drwxr-XR-x 2 root Root 4096 2010-04-15.

Please before running the configuration check and copy all config files from your Nagios directory to/usr/local/Nagios/etc/objects/and/usr/local/Nagios/etc/

Like

Config File '/usr/local/Nagios/etc/objects/commands. cfg '...

Object Config File '/usr/local/Nagios/etc/objects/contacts. cfg '...

Object Config File '/usr/local/Nagios/etc/objects/timeperiods. cfg '...

Object Config File '/usr/local/Nagios/etc/objects/templates. cfg '...

Object Config File '/usr/local/Nagios/etc/objects/localhost. cfg '...

• Verify the config:

sudo /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Output:

Nagios core 3.2.1

Copyright (c) 2009-2010 Nagios core development team and community contributors

Copyright (c) 1999-2009 Ethan galstad

Last modified: 03-09-2010

License: GPL

Web: http://www.nagios.org

Reading configuration data...

Read main config file okay...

Processing object Config File '/usr/local/Nagios/etc/objects/commands. cfg '...

Processing object Config File '/usr/local/Nagios/etc/objects/contacts. cfg '...

Processing object Config File '/usr/local/Nagios/etc/objects/timeperiods. cfg '...

Processing object Config File '/usr/local/Nagios/etc/objects/templates. cfg '...

Processing object Config File '/usr/local/Nagios/etc/objects/localhost. cfg '...

Read object config files okay...

Running pre-flight check on configuration data...

Checking services...

Checked 8 services.

Checking hosts...

Checked 1 hosts.

Checking host groups...

Checked 1 host groups.

Checking Service groups...

Checked 0 service groups.

Checking contacts...

Checked 1 contacts.

Checking contact groups...

Checked 1 contact groups.

Checking Service escalations...

Checked 0 service escalations.

Checking Service dependencies...

Checked 0 service dependencies.

Checking host escalations...

Checked 0 host escalations.

Checking host dependencies...

Checked 0 host dependencies.

Checking commands...

Checked 24 commands.

Checking time periods...

Checked 5 time periods.

Checking for circular paths between hosts...

Checking for circular host and service dependencies...

Checking Global Event Handlers...

Checking obsessive compulsive processor commands...

Checking MISC settings...

Total Warnings: 0

Total errors: 0

Things look okay-no serious problems were detected during the pre-flight check

Pirat9 @ pirat9-desktop :~ /Downloads/nagios-3.2.1 $

• Now start Nagios:

sudo /etc/init.d/nagios start

• Now you are ready to use Nagios, open your browser and type:

   http://hostname/nagios or http://ip/nagios