Installing Nagios

Installing Nagios
---------------------
*need to have basic centos install, with apache installed.



Install rpmforge repo

wget http://apt.sw.be/redhat/el5/en/i386/RPMS.dag/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
wget http://apt.sw.be/redhat/el5/en/x86_64/RPMS.dag/rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt
rpm -K rpmforge-release-0.3.6-1.el5.rf.*.rpm #verify package
rpm -i rpmforge-release-0.3.6-1.el5.rf.*.rpm #install package

Install yum-priorities #this is't required, but I like to limit the rpmforge repository from effecting any base packages

yum install yum-priorities
#Make sure that yum-priorities is enabled by editing the /etc/yum/pluginconf.d/priorities.conf
#Edit the .repo files in /etc/yum.repos.d/ and set up priorities by adding the line: (lower number = higher priority, 0 = disabled)
priority=N


Install nagios packages

sudo yum install nagios nagios-devel nagios-plugins nagios-plugins-setuid rrdtool


Configure Nagios

sudo htpasswd -c /etc/nagios/htpasswd.users kylec #Create htpasswd file for auth
sudo htpasswd /etc/nagios/htpasswd.users username #for adding users

sudo vi /etc/nagios/nagios.cfg
comment out...
#cfg_file=/etc/nagios/objects/templates.cfg
#cfg_file=/etc/nagios/objects/localhost.cfg
add...
cfg_file=/etc/nagios/objects/hosts.cfg
cfg_file=/etc/nagios/objects/hostgroups.cfg
cfg_file=/etc/nagios/objects/services.cfg
cfg_file=/etc/nagios/objects/contactgroups.cfg
set...
process_performance_data=1
host_perfdata_command=process-host-perfdata
service_perfdata_command=process-service-perfdata


sudo vi /etc/nagios/cgi.cfg
set...
authorized_for_system_information=*
authorized_for_configuration_information=*
authorized_for_system_commands=*
authorized_for_all_services=*
authorized_for_all_hosts=*
authorized_for_all_service_commands=*
authorized_for_all_host_commands=*


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Installing Nagios pnp

wget http://switch.dl.sourceforge.net/sourceforge/pnp4nagios/pnp-0.4.13.tar.gz
./configure
make all
make fullinstall

edit hosts.cfg

add:

define host{
use generic-host,host-pnp #add host-pnp to networking_machines_template


define host {
name host-pnp
register 0
action_url /nagios/pnp/index.php?host=$HOSTNAME$' onmouseover="get_g('$HOSTNAME$','_HOST_')" onmouseout="clear_g()"

}

edit services.cfg

Add to the main template... (in my case basic-service)

define service{
use generic-service,srv-pnp (srv-pnp is whats added)
name basic-service
.... truncated


define service {
name srv-pnp
register 0
action_url /nagios/pnp/index.php?host=$HOSTNAME$&srv=$SERVICEDESC$' onmouseover="get_g('$HOSTNAME$','$SERVICEDESC$')" onmouseout="clear_g()"

}

edit commands.cfg

add:

define command {
command_name process-service-perfdata
command_line /usr/bin/perl /usr/local/nagios/libexec/process_perfdata.pl
}

define command {
command_name process-host-perfdata
command_line /usr/bin/perl /usr/local/nagios/libexec/process_perfdata.pl -d HOSTPERFDATA
}

comment out the existing SAMPLE PERFORMANCE DATA COMMANDS

setup configs

cd /usr/local/nagios/etc/pnp/
sudo mv npcd.cfg-sample npcd.cfg
sudo mv process_perfdata.cfg-sample process_perfdata.cfg
sudo mv rra.cfg-sample rra.cfg


If you are seeing ... "File does not exist: /usr/share/nagios/pnp," in your httpd logs.
cp -R /usr/local/nagios/share/pnp/ /usr/share/nagios/pnp

edit as you would like them.

start npcd
/etc/init.d/npcd start
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EXAMPLE .cfgs #this is custom, these are just some examples to get you started.

contacts.cfg

define contact{
contact_name kyle
alias kyle
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r
host_notification_options d,u,r
service_notification_commands notify-by-email
host_notification_commands host-notify-by-email
email kyle@email.com
}

contactgroups.cfg

define contactgroup{
contactgroup_name admins
alias admins
members internal_infosec, kylepager
}


hosts.cfg

define host{
host_name website.com
address website.com
alias website.com
use networking_machines_template
}


hostgroups.cfg

define hostgroup{
hostgroup_name webservers
alias webservers
members server1, server2, server3, website.com
}

services.cfg

define service{
use basic-service
hostgroup_name webservers
service_description HTTP
check_command check_http!
contact_groups admins
}