How to Setup Nagios 3.4.4 Network Monitoring On Ubuntu Server 12.04/12.10

This guide will shown you how to installing latest version of nagios 3.4.4 on Ubuntu Server 12.04/12.10. Nagios is free and open source tool with GPL License allowing to control and monitor the items and services on a network. When it detects a problem it sends alert messages, either by mail or by other techniques.

Step by Step Installing and Configure Nagios 3.4.4 in Ubuntu Server 12.04/12.10

Step 1. Before installing Nagios 3.4.4 on Ubuntu Server 12.04/12.10, make sure your Ubuntu Server is up to date. Enter the following commands one by one, and install any available updates:

sudo apt-get update
sudo apt-get upgrade -y

Step 2.  Install Apache 2, PHP5, GCC ( development libraries and compilation), GD ( development libraries) on other package

sudo apt-get install build-essential apache2 php5-gd wget libgd2-xpm libgd2-xpm-dev libapache2-mod-php5 libssl-dev

Step 3. Create users and groups for Nagios:

sudo mkdir -p /etc/nagios /var/nagios
sudo groupadd --system --gid 9000 nagios
sudo groupadd --system --gid 9001 nagcmd
sudo adduser --system --gid 9000 --home /usr/local/nagios nagios
sudo usermod --groups nagcmd nagios
sudo usermod --append --groups nagcmd www-data
sudo chown nagios:nagios /usr/local/nagios /etc/nagios /var/nagios

Step 4. Download the source code of both compressed Nagios and the Nagios plugins (visit for links to the latest versions). At time of writing, the latest versions of Nagios 3.4.4 and the Nagios plugins 1.4.16

cd /usr/local/src/

Step 5. Extract, Compile and Install source of nagios 3.4.4

sudo tar -xzvf /usr/local/src/nagios-3.4.4.tar.gz
cd /usr/local/src/nagios
sudo ./configure --sysconfdir=/etc/nagios --localstatedir=/var/nagios --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-group=nagcmd --with-openssl=/usr/bin/openssl --enable-perl-modules --with-mail=/usr/bin/sendemail
sudo make all
sudo make install
sudo make install-init
sudo make install-config
sudo make install-commandmode

Step 6. Edit file /etc/objects/contacts.cfg to change the email address that is associated with nagiosadmin contact with the email address where you want to be alerted.

sudo nano /etc/objects/contacts.cfg


define contact{
               contact_name   nagiosadmin ;
               use            generic-contact ;
               alias          Ubuntu Precise ;
               email ;

Step 7. Edit file /etc/nagios/objects/commands.cfg to change both sendemail references to match the correct sendemail syntax:

sudo nano /etc/nagios/objects/commands.cfg
define command{
 command_name notify-host-by-email
 command_line /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /usr/bin/sendemail -s srv-mail:25 -f "admin <>" -t $CONTACTEMAIL$ -u "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **"
define command{
command_name notify-service-by-email
command_line /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$" | /usr/bin/sendemail -s srv-mail:25 -f "admin <>" -t $CONTACTEMAIL$ -u "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **"

Step 7. Now we need to configure Nagios to access it via web interface.

  • Install the web configuration file in the Apache conf.d directory:
cd /usr/local/src/nagios
sudo make install-webconf
  • Create password for Account nagiosadmin to enter the Nagios web interface. Remember the password you assign to this account – you will need it later. then restart apache2 daemon
sudo htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
sudo /etc/init.d/apache2 reload
  • Edit file /etc/apache2/apache2.conf and add the following line:
sudo nano /etc/apache2/apache2.conf
DirectoryIndex index.html index.php index.cgi

Step 8. Check your Nagios 3.4.4 configuration file for errors by typing following command. Look for errors in red

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

Step 9. Extract, Compile and install Nagios Plugins 1.4.16

cd /usr/local/src
sudo tar -zxvf /usr/local/src/nagios-plugins-1.4.16.tar.gz
cd /usr/local/src/nagios-plugins-1.4.16
sudo ./configure --sysconfdir=/etc/nagios --localstatedir=/var/nagios --with-nagios-user=nagios --with-nagios-group=nagios
sudo make
sudo make install

Step 10. Set Nagios is started whenever the system boots up, then restart nagios daemon

sudo /usr/sbin/update-rc.d -f nagios defaults 99
sudo ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios
sudo /etc/init.d/nagios restart

If all goes well, we should now be able to enter a Web browser to access Nagios administrator panel. Open a web browser and enter:


We ask for the username (nagiosadmin) with the password you have chosen in step 7.  If all went well you should see the home page of Nagios Administrator Panel

Link Reference:

Tags: #Nagios #Network #Ubuntu Server 12.04 #Ubuntu Server 12.10

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