Nagios with graphs installation (step by step)

Did you ever wanted to have alerting system (such as Nagios) and add some graphs

you can find here a short post, with a full description of adding graphs to Nagios

I also add configuration example

• apt-get update
• apt-get install nagios3 gcc php5-gd rrdtool librrds-perl make -y
• cd /usr/src/
• wget http://downloads.sourceforge.net/project/pnp4nagios/PNP-0.6/pnp4nagios-0.6.16.tar.gz?r=http%3A%2F%2Fdocs.pnp4nagios.org%2Fpnp-0.6%2Fdwnld&ts=1330609501&use_mirror=garr
• mv pnp4nagios-0.6.16.tar.gz\?r\=http\:%2F%2Fdocs.pnp4nagios.org%2Fpnp-0.6%2Fdwnld pnp4nagios-0.6.16.tar.gz
• tar zxvf pnp4nagios-0.6.16.tar.gz
• cd pnp4nagios-0.6.16
• ./configure
• make all
• make fullinstall
• mv /etc/apache2/conf.d/pnp4nagios.conf /etc/apache2/pnp4nagios.ORIG
• cat /etc/apache2/pnp4nagios.ORIG | sed -e '/Auth.*/d' | sed -e '/Require valid-user/d' | tee /etc/apache2/conf.d/pnp4nagios.conf
• /etc/init.d/apache2 reload
• curl http://localhost/pnp4nagios
• mv /usr/local/pnp4nagios/share/install.php /usr/local/pnp4nagios/share/install.php.ORIG
• cd /etc/nagios3/conf.d/
• vi graphs.cfg

define host {

  name       host-pnp

  action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_

  register   0

}

define service {

  name       srv-pnp

  action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$

  register   0

}

• vi /etc/nagios3/nagios.cfg (uncomment the following)

process_performance_data=1

enable_environment_macros=1

use_regexp_matching=1

check_external_command=1

host_perfdata_command=process-host-perfdata

service_perfdata_command=process-service-perfdata

user=root

group=root

• vi /usr/local/pnp4nagios/libexec/process_perfdata.pl (comment the following)

#if( $< == 0 ){

#    print "dont try this as root \n";

#    exit 1;

#}

• vi /etc/nagios3/commands.cfg

define command{

        command_name    process-host-perfdata

        command_line    /usr/bin/perl /usr/local/pnp4nagios/libexec/process_perfdata.pl -d HOSTPERFDATA

#       command_line    /usr/bin/printf "%b" "$LASTHOSTCHECK$\t$HOSTNAME$\t$HOSTSTATE$\t$HOSTATTEMPT$\t$HOSTSTATETYPE$\t$HOSTEXECUTIONTIME$\t$HOSTOUTPUT$\t$HOSTPERFDATA$\n" >> /var/lib/nagios3/host-perfdata.out

        }

# 'process-service-perfdata' command definition

define command{

        command_name    process-service-perfdata

        command_line    /usr/bin/perl /usr/local/pnp4nagios/libexec/process_perfdata.pl

        #command_line   /usr/bin/printf "%b" "$LASTSERVICECHECK$\t$HOSTNAME$\t$SERVICEDESC$\t$SERVICESTATE$\t$SERVICEATTEMPT$\t$SERVICESTATETYPE$\t$SERVICEEXECUTIONTIME$\t$SERVICELATENCY$\t$SERVICEOUTPUT$\t$SERVICEPERFDATA$\n" >> /var/lib/nagios3/service-perfdata.out

        }

• vi /etc/nagios3/conf.d/hostgroups_nagios2.cfg
• members         .*
• vi /etc/nagios3/conf.d/hosts.cfg

define host{

        use                     generic-host,host-pnp

        host_name               linux-monitor

        alias                   linux-monitor

        address                 localhost

        }

• vi /etc/nagios3/conf.d/services.cfg

define service{

        use                     generic-service,srv-pnp

        host_name               linux-*

        service_description     PING

        check_command           check_ping!100.0,20%!500.0,60%

        }

• vi /etc/ssh/ssh_config (in order to prevent ssh check)
• StrictHostKeyChecking no
• UserKnownHostsFile=/dev/null
•