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Nagios :: Mini How To 


Nagios is an Open Source host, service and network monitoring program.


Contents

Nagios Installation


Below are simple steps to install nagios to our system.

Users / Groups


We must create a new user / group for nagios software.


# useradd nagios

Verify


# grep nagios /etc/passwd /etc/group
 
/etc/passwd:nagios:x:1001:1001::/home/nagios:/bin/sh
/etc/group:nagios:x:1001:

Next we must create a new group for nagios and apache user


# groupadd nagcmd
# usermod -G nagcmd nagios

The apache user can be defined by this:


# grep '^User ' /usr/local/apache2/conf/httpd.conf|cut -d' ' -f2
apache 
 
# usermod -G nagcmd apache

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Nagios Installation


We should create the installation path and transfer the ownership tou user nagios


mkdir -pv /usr/local/nagios
chown -R nagios.nagios /usr/local/nagios

Downloading the sources


wget -c http://heanet.dl.sourceforge.net/sourceforge/nagios/nagios-2.10.tar.gz
tar zxfv nagios-2.10.tar.gz
cd nagios-2.10

Configure & compile nagios


./configure
make all make install
make install-init
make install-commandmode
make install-config

If we want to use the sample confs from the nagios installation we should do this:


# cd /usr/local/nagios/etc/
# for i in `ls` ; do mv $i `echo $i | cut -d'-' -f1` ; done

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Nagios-plugins


After we finished the nagios installation we should continue with the installation of nagios-plugin.
So we download the sources from below:


# wget -c http://heanet.dl.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.10.tar.gz
# tar zxvf nagios-plugins-1.4.10.tar.gz

And we build nagios plugin :


# cd nagios-plugins-1.4.10
# ./configure LDFLAGS=-ldl
# make
# make install

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Start Nagios


We can start nagios application by doing this :


# /etc/init.d/nagios start

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Apache Virtual Host


if we want to setup apache, we simply add the below virtual host:


# cat > /usr/local/apache2/conf/nagios.conf << EOF
 
ScriptAlias /nagios/cgi-bin /usr/local/nagios/sbin
 
<Directory "/usr/local/nagios/sbin">
    Options ExecCGI
    AllowOverride None
    Order allow,deny
    Allow from all AuthName "Nagios Access"
    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 AuthName "Nagios Access"
    AuthType Basic
    AuthUserFile /usr/local/nagios/etc/htpasswd.users
    Require valid-user
</Directory>
 
EOF

And add at the apache conf httpd.conf file the below conf line:


# echo Include conf/nagios.conf >> /usr/local/apache2/conf/httpd.conf

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Adding users to nagios web host 


# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
New password: ******
Re-type new password: ******
Adding password for user nagiosadmin

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Basic Configuration


Change configuration for nagios group to access / view the hosts


# vim /usr/local/nagios/etc/cgi.cfg
[ edit ] 
use_authentication=1
authorized_for_system_information=nagiosadmin
authorized_for_configuration_information=nagiosadmin
authorized_for_system_commands=nagiosadmin
authorized_for_all_services=nagiosadmin
authorized_for_all_hosts=nagiosadmin
authorized_for_all_service_commands=nagiosadmin
authorized_for_all_host_commands=nagiosadmin
 
# /etc/init.d/nagios restart

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/usr/local/apache2/bin/httpd -k restart
 
lynx http://localhost/nagios
 
username: nagiosadmin
password: **********

Verify Configuration


/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
/etc/init.d/nagios start
ps -ef | grep nagios
lynx http://localhost/nagios

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fruity


http://fruity.sourceforge.net/


Groundwork Fruity is a PHP based web-frontend to your Nagios configuration


$ wget -c http://belnet.dl.sourceforge.net/sourceforge/fruity/fruity-1.0-rc2.tar.gz
$ tar zxvf fruity-1.0-rc2.tar.gz
$ cd fruity-1.0-rc2

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