Memcached

Memcached is an open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Our integration pulls in statistics from the Memcached stats command for comprehensive and complete Memcached monitoring.

The Librato Agent allows you to easily monitor the health of your Memcached service(s). We gather statistics from the Memcached stats command and emit them to your Librato account, along with your other server metrics.

Installation

The Memcached integration depends on the Librato Agent. If you haven’t already, you will first need to install the Librato Agent. Once this is complete, select the Memcached icon in the integrations catalogue.

Toggle the Enabled switch to activate the Memcached integration on your Librato account and create the preconfigured Memcached Space.

At this point your integration is complete and any Memcached metrics associated with this integration will be allowed through your Librato Agent service-side filters.

Plugin Configuration

By default, Memcached listens on localhost port 11211. If necessary, this can be adjusted in your /opt/collectd/etc/collectd.conf.d/memcached.conf file.

LoadPlugin memcached
<Plugin memcached>
  <Instance "local">
    Host "127.0.0.1"
    Port "11211"
  </Instance>
</Plugin>

Note: You must restart the collectd service after any changes to your Librato Agent configuration files.

$ sudo service collectd restart

At this point you should begin seeing librato.memcached.* metrics in your Librato account.

Filtering by Instance

This plugin is optimized for the Librato monitoring service. In addition to gathering service metrics made available via Memcached’s stats command, we normalize the metrics so that the Instance (as defined in memcached.conf) is captured in the name tag. By default we set this value to local, although you can edit this value (or add more services) and Librato will automatically add a data stream for each Instance given. This makes it easy to leverage Librato’s Dynamic Tags feature across your Memcached hosts.

Memcached Workspace

Visit your preconfigured Space to observe your new metrics as they stream in. You can use the dynamic tags field at the top to filter your view to a subset of metrics.

FAQ

For specific answers to Collectd questions check out our Librato Agent FAQ.

Please let us know what you think about this integration. We would love to incorporate your feedback and any ideas you have on dashboard design into the ongoing development of our integrations.