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<div class="section" id="nagiosgen">
<span id="server-plugins-generators-nagiosgen"></span><h1>NagiosGen<a class="headerlink" href="#nagiosgen" title="Permalink to this headline">¶</a></h1>
<p>This page describes the installation and use of the <a class="reference external" href="http://trac.mcs.anl.gov/projects/bcfg2/browser/src/lib/Server/Plugins/NagiosGen.py">NagiosGen</a> plugin.</p>
<p>Update <tt class="docutils literal"><span class="pre">/etc/bcfg2.conf</span></tt>, adding NagiosGen to plugins:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">plugins</span> <span class="o">=</span> <span class="n">Base</span><span class="p">,</span><span class="n">Bundler</span><span class="p">,</span><span class="n">Cfg</span><span class="p">,</span><span class="o">...</span><span class="p">,</span><span class="n">NagiosGen</span>
</pre></div>
</div>
<p>Create the NagiosGen directory:</p>
<div class="highlight-python"><pre>$ mkdir /var/lib/bcfg2/NagiosGen</pre>
</div>
<p>Create default host, and group specs in:</p>
<p><tt class="docutils literal"><span class="pre">/var/lib/bcfg2/NagiosGen/default-host.cfg</span></tt>:</p>
<div class="highlight-python"><pre>define host{
name default
check_command check-host-alive
check_interval 5
check_period 24x7
contact_groups admins
event_handler_enabled 1
failure_prediction_enabled 1
flap_detection_enabled 1
initial_state o
max_check_attempts 10
notification_interval 0
notification_options d,u,r
notification_period workhours
notifications_enabled 1
process_perf_data 0
register 0
retain_nonstatus_information 1
retain_status_information 1
retry_interval 1
}</pre>
</div>
<p><tt class="docutils literal"><span class="pre">/var/lib/bcfg2/NagiosGen/default-group.cfg</span></tt>:</p>
<div class="highlight-python"><pre>define service{
name default-service
active_checks_enabled 1
passive_checks_enabled 1
obsess_over_service 0
check_freshness 0
notifications_enabled 1
event_handler_enabled 1
flap_detection_enabled 1
process_perf_data 0
retain_status_information 1
retain_nonstatus_information 1
is_volatile 0
check_period 24x7
max_check_attempts 4
check_interval 5
retry_interval 1
contact_groups admins
notification_options w,u,c,r
notification_interval 0
notification_period workhours
}</pre>
</div>
<p>Create group configuration files (Named identical to Bcfg2 groups) and
add services, and commands specific to the hostgroup (Bcfg2 group) in</p>
<p><tt class="docutils literal"><span class="pre">/var/lib/bcfg2/NagiosGen/base-group.cfg</span></tt>:</p>
<div class="highlight-python"><pre>define hostgroup{
hostgroup_name base
alias base
notes Notes
}
define service{
service_description NTP
check_command check_ntp!
use default-service
hostgroup_name base
}
define command{
command_name check_ssh
command_line $USER1$/check_ssh $ARG1$ $HOSTADDRESS$
}
define service{
service_description SSH
check_command check_ssh!
use default-service
hostgroup_name base
}</pre>
</div>
<p><tt class="docutils literal"><span class="pre">/var/lib/bcfg2/NagiosGen/web-server-group.cfg</span></tt>:</p>
<div class="highlight-python"><pre>define hostgroup{
hostgroup_name web-server
alias Port 80 Web Servers
notes UC/ANL Teragrid Web Servers Running on Port 80
}
define command{
command_name check_http_80
command_line $USER1$/check_http $HOSTADDRESS$
}
define service{
service_description HTTP:80
check_command check_http_80!
use default-service
hostgroup_name web-server
}</pre>
</div>
<p>Create a nagios Bcfg2 bundle <tt class="docutils literal"><span class="pre">/var/lib/bcfg2/Bundler/nagios.xml</span></tt></p>
<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><Bundle</span> <span class="na">name=</span><span class="s">'nagios'</span> <span class="na">version=</span><span class="s">'2.0'</span><span class="nt">></span>
<span class="nt"><Path</span> <span class="na">name=</span><span class="s">'/etc/nagiosgen.status'</span><span class="nt">/></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'rh'</span><span class="nt">></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'nagios-server'</span><span class="nt">></span>
<span class="nt"><Path</span> <span class="na">name=</span><span class="s">'/etc/nagios/nagiosgen.cfg'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'libtool-libs'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'nagios'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'nagios-www'</span><span class="nt">/></span>
<span class="nt"><Service</span> <span class="na">name=</span><span class="s">'nagios'</span><span class="nt">/></span>
<span class="nt"></Group></span>
<span class="nt"></Group></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'debian-lenny'</span><span class="nt">></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'nagios-server'</span><span class="nt">></span>
<span class="nt"><Path</span> <span class="na">name=</span><span class="s">'/etc/nagios3/nagiosgen.cfg'</span>
<span class="na">altsrc=</span><span class="s">'/etc/nagios/nagiosgen.cfg'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'nagios3'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'nagios3-common'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'nagios3-doc'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'nagios-images'</span><span class="nt">/></span>
<span class="nt"><Service</span> <span class="na">name=</span><span class="s">'nagios3'</span><span class="nt">/></span>
<span class="nt"></Group></span>
<span class="nt"></Group></span>
<span class="nt"></Bundle></span>
</pre></div>
</div>
<p>Assign clients to nagios groups in
<tt class="docutils literal"><span class="pre">/var/lib/bcfg2/Metadata/groups.xml</span></tt></p>
<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><Group</span> <span class="na">name=</span><span class="s">'nagios'</span><span class="nt">></span>
<span class="nt"><Bundle</span> <span class="na">name=</span><span class="s">'nagios'</span><span class="nt">/></span>
<span class="nt"></Group></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'nagios-server'</span><span class="nt">></span>
<span class="nt"><Bundle</span> <span class="na">name=</span><span class="s">'nagios'</span><span class="nt">/></span>
<span class="nt"></Group></span>
</pre></div>
</div>
<p>Update nagios configuration file to use <tt class="docutils literal"><span class="pre">nagiosgen.cfg</span></tt>:</p>
<div class="highlight-python"><pre>cfg_file=/etc/nagios/nagiosgen.cfg</pre>
</div>
<p>Note that some of these files are built on demand, each time a client
in group “nagios-server” checks in with the Bcfg2 server. Local nagios
instances can be configured to use the NagiosGen directory in the Bcfg2
repository directly.</p>
<div class="section" id="fine-grained-configuration">
<h2>Fine-Grained Configuration<a class="headerlink" href="#fine-grained-configuration" title="Permalink to this headline">¶</a></h2>
<p>NagiosGen can be configured in excruciating detail by editing
<tt class="docutils literal"><span class="pre">NagiosGen/config.xml</span></tt>, which will let you set individual Nagios
options for hosts or groups. E.g.:</p>
<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><NagiosGen></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">"datacenter-2"</span><span class="nt">></span>
<span class="nt"><Option</span> <span class="na">name=</span><span class="s">"parents"</span><span class="nt">></span>dc-2-switch<span class="nt"></Option></span>
<span class="nt"></Group></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">"non-production"</span><span class="nt">></span>
<span class="nt"><Option</span> <span class="na">name=</span><span class="s">"notification_period"</span><span class="nt">></span>workhours<span class="nt"></Option></span>
<span class="nt"><Option</span> <span class="na">name=</span><span class="s">"notification_options"</span><span class="nt">></span>d<span class="nt"></Option></span>
<span class="nt"></Group></span>
<span class="nt"><Client</span> <span class="na">name=</span><span class="s">"foo.example.com"</span><span class="nt">></span>
<span class="nt"><Option</span> <span class="na">name=</span><span class="s">"max_check_attempts"</span><span class="nt">></span>10<span class="nt"></Option></span>
<span class="nt"></Client></span>
<span class="nt"></NagiosGen></span>
</pre></div>
</div>
<p>Obviously the sort of fine-grained control you get from this overlaps
to some degree with Nagios’ own templating, so use it wisely and in
moderation.</p>
<p><tt class="docutils literal"><span class="pre">NagiosGen/config.xml</span></tt> replaces the files
<tt class="docutils literal"><span class="pre">Properties/NagiosGen.xml</span></tt> and <tt class="docutils literal"><span class="pre">NagiosGen/parents.xml</span></tt> in older
versions of Bcfg2; your old configs can be migrated using the
<tt class="docutils literal"><span class="pre">nagiosgen-convert.py</span></tt> tool. The plugin does contain a
backwards-compatibility layer for those older config files, but
<tt class="docutils literal"><span class="pre">NagiosGen/config.xml</span></tt> must exist (even if empty) for the plugin to
function.</p>
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