Nagios 4.1.1: Adding Nagios graphs to Nagios Core services

Nagios Graphs

Adding graphs to the Nagios server will allow monitoring the services and hosts performance in the past, these graphs can be monitored for Day, week, Month and Yearly 

Assuming that you have already configured the Nagios 4.1.1 Core Server if not follow this link to configure http://srsystemadminscripts.blogspot.in/2015/12/nagios-411-nagios-core-411-installation.html

Create a folder for the source:

#  mkdir -p /usr/local/src/nagiosgraph/
# cd /usr/local/src/nagiosgraph/

Download the latest version:

# wget http://downloads.sourceforge.net/project/nagiosgraph/nagiosgraph/1.5.2/nagiosgraph-1.5.2.tar.gz
# tar -xf nagiosgraph-1.5.2.tar.gz
# cd nagiosgraph-1.5.2


Installing the dependencies for Nagios Graphs in Nagios server 


# yum install perl-rrd* perl-GD* perl-CPAN perl-Digest-MD5 perl-Module-Build  perl-Nagios-Plugin install perl-GD php-gd rrdtool-perl rrdtool-php rrdtool perl-CGI perl-Time-HiRes -y

Configure Nagios::Config: FAIL

# perl -MCPAN -e shell

 Press enter for all the prompts till we get cpan[1]> prompt


cpan[1]> install Nagios::Config

Press enter for all the prompts till we get cpan[1]> prompt

type \exit to get into shell prompt 

Check that we have all the dependencies installed:

# ./install.pl --check-prereq

 Output:
checking required PERL modules
  Carp...1.29
  CGI...3.64
  Data::Dumper...2.145
  Digest::MD5...2.52
  File::Basename...2.84
  File::Find...1.23
  MIME::Base64...3.13
  POSIX...1.32
  RRDs...1.4007
  Time::HiRes...1.9725
checking optional PERL modules
  GD...2.46
checking nagios installation
  found nagios exectuable at /usr/local/nagios/bin/nagios
checking web server installation
  found apache executable at /usr/sbin/apache2

  found apache init script at /etc/init.d/apache2

Start the installation:
# ./install.pl --layout standalone --prefix /usr/local/nagiosgraph

 Give the default answer to all the questions except the below one:

 Modify the Nagios configuration? [n] y
Path of Nagios commands file? /usr/local/nagios/etc/objects/commands.cfg
Modify the Apache configuration? [n] y


Create the Apache configuration file at this location "/usr/local/nagiosgraph/etc/",  so that we can get the Nagios graphs from url, below are the commands to create the file and edit with the below contents.


# touch /usr/local/nagiosgraph/etc/nagiosgraph-apache.conf

# vi /usr/local/nagiosgraph/etc/nagiosgraph-apache.conf

Add the following to the file:


# enable nagiosgraph CGI scripts
ScriptAlias /nagiosgraph/cgi-bin "/usr/local/nagiosgraph/cgi"
<Directory "/usr/local/nagiosgraph/cgi">
   Options ExecCGI
   AllowOverride None
         Require all granted
         AuthName "Nagios Access"
         AuthType Basic
         AuthUserFile /usr/local/nagios/etc/htpasswd.users
         Require valid-user
   Order allow,deny
   Allow from all

 </Directory>

 # enable nagiosgraph CSS and JavaScript
Alias /nagiosgraph "/usr/local/nagiosgraph/share"

 <Directory "/usr/local/nagiosgraph/share">
   Options None
   AllowOverride None
        Require all granted
#        Require host 127.0.0.1
         AuthName "Nagios Access"
         AuthType Basic
         AuthUserFile /usr/local/nagios/etc/htpasswd.users
         Require valid-user
   Order allow,deny
   Allow from all
</Directory>

Restart Nagios and Apache:


# service nagios restart

# service apache2 restart

You can now view the graphs at https://you-ip-address/nagiosgraph/cgi-bin/show.cgi.


We can integrate these graphs into Nagios with a little hack. Nagios supports notes_url and action_url. These can be put per host/service in the Nagios config and allow for a link to a internal knowledge base article or a procedure page or whatever for that host.

We can also place a javascript url to the graphs there. Place this inside any service check: in windows.cfg, localhost.cfg, services.cfg files which are located in /usr/local/nagios/etc folder



action_url      /nagiosgraph/cgi-bin/show.cgi?host=$HOSTNAME$&service=$SERVICEDESC$&geom=1000x200' onMouseOver='showGraphPopup(this)' onMouseOut='hideGraphPopup()' rel='/nagiosgraph/cgi-bin/showgraph.cgi?host=$HOSTNAME$&service=$SERVICEDESC$



For example, the Load of the system:

# vi /usr/local/nagios/etc/objects/localhost.cfg

define service {
        use                              local-service
        host_name                  localhost
        service_description    Load
        check_command           check_local_load!5.0,4.0,3.0!10.0,6.0,4.0
        action_url              /nagiosgraph/cgi-bin/show.cgi?host=$HOSTNAME$&service=$SERVICEDESC$&geom=1000x200' onMouseOver='showGraphPopup(this)' onMouseOut='hideGraphPopup()' rel='/nagiosgraph/cgi-bin/showgraph.cgi?host=$HOSTNAME$&service=$SERVICEDESC$
}

For the ping check you can show both RTA and packet loss:

define service {
        use                     local-service
        host_name               localhost
        service_description     PING
        check_command           check_ping!100.0,20%!500.0,60%
        action_url              /nagiosgraph/cgi-bin/show.cgi?host=$HOSTNAME$&service=$SERVICEDESC$&db=pl,data&db=pl,warn&db=pl,crit&geom=1000x200' onMouseOver='showGraphPopup(this)' onMouseOut='hideGraphPopup()' rel='/nagiosgraph/cgi-bin/showgraph.cgi?host=$HOSTNAME$&service=$SERVICEDESC$&db=pl,data&db=pl,warn&db=pl,crit

        

We need to include the Nagios Graph Javascript in Nagios to make sure the mouseover works. Edit or create the following file:


# vim /usr/local/nagios/share/ssi/common-header.ssi

Place the following in there:

<script type="text/javascript" src="/nagiosgraph/nagiosgraph.js"></script>


Now save and reload Nagios:

# service nagios restart





Keywords: Nagios, Monitoring, Linux host, Ading Linux host, Nagios Graph, MRTG Graphs, Nagios MRTG Graphs









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