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<div class="section" id="ganglia">
<h1>ganglia<a class="headerlink" href="#ganglia" title="Permalink to this headline">¶</a></h1>
<p>Another interesting example of Genshi templating is to automatically
generate <tt class="docutils literal"><span class="pre">gmond</span></tt>/<tt class="docutils literal"><span class="pre">gmetad</span></tt> configuration files. The idea is that
each cluster is headless: it communicates with the rest of the cluster
members on an isolated multicast IP address and port. Any of the
cluster members is therefore isolated on that particular ip/port
pair. Additionally, each <tt class="docutils literal"><span class="pre">gmond</span></tt> instance <strong>also</strong> listens on
UDP. This allows for any of the cluster members to be polled for
information on the entire cluster!</p>
<p>The second part of the trick is in <tt class="docutils literal"><span class="pre">gmetad.conf</span></tt>. Here, we
dynamically generate a list of clusters (based on profiles names) and
a list of members to poll (based on the clients in said profiles). As
the number of profiles and client grows, this list will grow
automatically as well. When a new host is added, <tt class="docutils literal"><span class="pre">gmetad</span></tt> will
receive an updated configuration and act accordingly.</p>
<p>There <strong>is</strong> one caveat though. The <tt class="docutils literal"><span class="pre">gmetad.conf</span></tt> parser is hard
coded to read 16 arguments per <tt class="docutils literal"><span class="pre">data_source</span></tt> line. If you have more
than 15 nodes in a cluster, you will see a warning in the logs. You
can either ignore it, or truncate the list to the first 15 members.</p>
<p>In our environment, a profile is a one to one match with the role of
that particular host. You can also do this based on groups, or any
other client property.</p>
<div class="section" id="bundler-ganglia-xml">
<h2>Bundler/ganglia.xml<a class="headerlink" href="#bundler-ganglia-xml" title="Permalink to this headline">¶</a></h2>
<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><Bundle</span> <span class="na">name=</span><span class="s">'ganglia'</span><span class="nt">></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'ganglia-gmond'</span> <span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'ganglia-gmond-modules-python'</span> <span class="nt">/></span>
<span class="nt"><Path</span> <span class="na">name=</span><span class="s">'/etc/ganglia/gmond.conf'</span> <span class="nt">/></span>
<span class="nt"><Service</span> <span class="na">name=</span><span class="s">'gmond'</span> <span class="nt">/></span>
<span class="nt"><Action</span> <span class="na">name=</span><span class="s">'gmond-reload'</span> <span class="nt">/></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'gmetad-server'</span><span class="nt">></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'ganglia-gmetad'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'ganglia-web'</span><span class="nt">/></span>
<span class="nt"><Package</span> <span class="na">name=</span><span class="s">'rrdtool'</span><span class="nt">/></span>
<span class="nt"><Path</span> <span class="na">name=</span><span class="s">'/etc/ganglia/gmetad.conf'</span> <span class="nt">/></span>
<span class="nt"><Service</span> <span class="na">name=</span><span class="s">'gmetad'</span> <span class="nt">/></span>
<span class="nt"></Group></span>
<span class="nt"></Bundle></span>
</pre></div>
</div>
</div>
<div class="section" id="rules-services-ganglia-xml">
<h2>Rules/services-ganglia.xml<a class="headerlink" href="#rules-services-ganglia-xml" title="Permalink to this headline">¶</a></h2>
<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><Rules</span> <span class="na">priority=</span><span class="s">'10'</span><span class="nt">></span>
<span class="nt"><Service</span> <span class="na">name=</span><span class="s">'gmond'</span> <span class="na">type=</span><span class="s">'chkconfig'</span> <span class="na">status=</span><span class="s">'on'</span> <span class="nt">/></span>
<span class="nt"><Group</span> <span class="na">name=</span><span class="s">'gmetad-server'</span><span class="nt">></span>
<span class="nt"><Service</span> <span class="na">name=</span><span class="s">'gmetad'</span> <span class="na">type=</span><span class="s">'chkconfig'</span> <span class="na">status=</span><span class="s">'on'</span> <span class="nt">/></span>
<span class="nt"></Group></span>
<span class="nt"></Rules></span>
</pre></div>
</div>
</div>
<div class="section" id="cfg-etc-ganglia-gmetad-conf-gmetad-conf-genshi">
<h2>Cfg/etc/ganglia/gmetad.conf/gmetad.conf.genshi<a class="headerlink" href="#cfg-etc-ganglia-gmetad-conf-gmetad-conf-genshi" title="Permalink to this headline">¶</a></h2>
<div class="highlight-none"><div class="highlight"><pre>{% python
client_metadata = metadata.query.all()
profile_array = {}
seen = []
for item in client_metadata:
if item.profile not in seen:
seen.append(item.profile)
profile_array[item.profile]=[]
profile_array[item.profile].append(item.hostname)
seen.sort()
%}\
gridname "Our Grid"
{% for profile in seen %}
data_source "${profile}" \
{% for host in profile_array[profile] %}\
${host} \
{% end %}\
{% end %}
rrd_rootdir "/var/lib/ganglia/rrds"
</pre></div>
</div>
</div>
<div class="section" id="cfg-etc-ganglia-gmond-conf-gmod-conf-genshi">
<h2>Cfg/etc/ganglia/gmond.conf/gmod.conf.genshi<a class="headerlink" href="#cfg-etc-ganglia-gmond-conf-gmod-conf-genshi" title="Permalink to this headline">¶</a></h2>
<div class="highlight-none"><div class="highlight"><pre>{% python
import random
random.seed(metadata.profile)
last_octet=random.randint(2,254)
%}\
/*
$$Id$$
$$HeadURL$$
*/
/* This configuration is as close to 2.5.x default behavior as possible
The values closely match ./gmond/metric.h definitions in 2.5.x */
globals {
daemonize = yes
setuid = yes
user = nobody
debug_level = 0
max_udp_msg_len = 1472
mute = no
deaf = no
host_dmax = 1800 /* 30 minutes */
cleanup_threshold = 604800 /*secs=1 week */
gexec = no
send_metadata_interval = 0
}
/* If a cluster attribute is specified, then all gmond hosts are wrapped inside
* of a <CLUSTER> tag. If you do not specify a cluster tag, then all <HOSTS> will
* NOT be wrapped inside of a <CLUSTER> tag. */
cluster {
name = "${metadata.profile}"
owner = "user@company.net"
latlong = "unspecified"
url = "unspecified"
}
/* The host section describes attributes of the host, like the location */
host {
location = "unspecified"
}
/* Feel free to specify as many udp_send_channels as you like. Gmond
used to only support having a single channel */
udp_send_channel {
host = ${metadata.hostname}
port = 8649
}
udp_send_channel {
mcast_join = 239.2.11.${last_octet}
port = 8649
ttl = 1
}
/* You can specify as many udp_recv_channels as you like as well. */
udp_recv_channel {
port = 8649
bind = ${metadata.hostname}
}
udp_recv_channel {
mcast_join = 239.2.11.${last_octet}
bind = 239.2.11.${last_octet}
port = 8649
}
/* You can specify as many tcp_accept_channels as you like to share
an xml description of the state of the cluster */
tcp_accept_channel {
port = 8649
}
/* Each metrics module that is referenced by gmond must be specified and
loaded. If the module has been statically linked with gmond, it does not
require a load path. However all dynamically loadable modules must include
a load path. */
modules {
/* [snip] */
</pre></div>
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<h3><a href="../../../../../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">ganglia</a><ul>
<li><a class="reference internal" href="#bundler-ganglia-xml">Bundler/ganglia.xml</a></li>
<li><a class="reference internal" href="#rules-services-ganglia-xml">Rules/services-ganglia.xml</a></li>
<li><a class="reference internal" href="#cfg-etc-ganglia-gmetad-conf-gmetad-conf-genshi">Cfg/etc/ganglia/gmetad.conf/gmetad.conf.genshi</a></li>
<li><a class="reference internal" href="#cfg-etc-ganglia-gmond-conf-gmod-conf-genshi">Cfg/etc/ganglia/gmond.conf/gmod.conf.genshi</a></li>
</ul>
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