Gem for collecting memcached, disk, cpu and IO statistics. Collected stats are sent to the New Relic RPM application.
Use this gem to collect statistics from a given host by running newrelic_ia -a as a daemon. This will contribute System/* metrics to your RPM console which can be viewed with custom dashboards.
newrelic_ia [ options ] aspect, aspect..
aspect: one or more of 'iostat' or 'disk' or 'memcached' (more to come)
-a, --all use all available aspects
-v, --verbose debug output
-q, --quiet quiet output
-e, --environment=ENV use ENV section in newrelic.yml
--install create a default newrelic.yml
-h, --help Show this help message.
-
New Relic Agent version 2.10.6 or later
-
Gold Subscription for creating and viewing custom dashboards
sudo gem install newrelic_ia
Once installed, run from the home directory of your Rails application, or create a separate working directory and run
newrelic_ia --install
to create a template newrelic.yml file you can use. Edit this file and substitute your license key and app_name value.
specify memcached nodes in memcached-nodes.txt.
Special thanks to Chandra Patni and Tony Ford of IGN for the Memcached sampler.
Memcached statistics sampler collects subset of stats provided by memcached daemon, once a minute. In addition it computes other stats dervied from memcached stats. Also support stats derivatives over time to compute rate etc. Specify Memcached nodes configuration in the newrelic.yml file.
Memcached stats are reported for each node and also sample reports aggregated stats
uptime Number of seconds this server has been running
curr_items Current number of items stored by the server
total_items Total number of items stored by this server
ever since it started
bytes Current number of bytes used by this server to store items
curr_connections Number of open connections
total_connections Total number of connections opened since
the server started running
connection_structures Number of connection structures allocated by the server
cmd_get Cumulative number of retrieval requests
cmd_set Cumulative number of storage requests
get_hits Number of keys that have been requested and found present
get_misses Number of items that have been requested and not found
evictions Number of valid items removed from cache to free
memory for new items
bytes_read Total number of bytes read by this server from network
bytes_written Total number of bytes sent by this server to network
limit_maxbytes Number of bytes this server is allowed to use for storage
threads Number of worker threads requested
Derived Stats (computed stats):
free_maxbytes Number of free bytes this server has available for storage
Stats Derivatives (time derivatives of stats):
hit_ratio Percent of keys that have been requested and found present miss_ratio Percent of keys that have been requested and found missing rpm Requests per minutes gpm Gets per minutes hpm Hits per minutes mpm Misses per minutes spm Sets per minutes fpm Flushes per minutes epm Evictions per minutes
Liquid template for NewRelic custom dashboard:
<div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Miss Ratio' metric:'System/Memcached/Miss Ratio' simple_tooltip:true label:segment_3 value_suffix:'%' %}
</div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Memory' regexp:'System/Memcached/(Bytes|Free Bytes|Limit Maxbytes)' simple_tooltip:true label:segment_3 %}
</div>
<br style="clear: both" />
</div>
<div style="padding-top: 20px"> </div>
<div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Gets & Sets' regexp:'System/Memcached/(Gpm|Spm)' simple_tooltip:true label:segment_3 %}
</div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Misses, Flushes, & Evictions' regexp:'System/Memcached/(Mpm|Epm|Fpm)' simple_tooltip:true label:segment_3 %}
</div>
<br style="clear: both" />
</div>
<div style="padding-top: 20px"> </div>
<div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Active Connections' metric:'System/Memcached/Curr Connections' simple_tooltip:true hide_legend:true %}
</div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Objects' metric:'System/Memcached/Curr Items' simple_tooltip:true hide_legend:true %}
</div>
<br style="clear: both" />
</div>