There is a very basic tool for simulating PuppetDB loads included with the standard PuppetDB distribution. This tool is currently in beta and is likely to change in future releases. Although this tool was originally intended as a PuppetDB developer tool, documentation is provided here in the event others would find it useful. It has the ability to submit catalogs and/or reports at a defined interval, for a specified number of nodes. It is also able to vary the submitted catalogs over time to simulate catalog changes (which can cause higher PuppetDB load). The intent of the tool is to get a rough idea around how the system (and software) will handle load under realistic conditions. The tool will use catalogs/reports specified by the user, which could be exported from a production/running system, to simulate real-world conditions.

Getting data for the tool

The tool does not yet have the ability to generate catalog/reports. Before using this tool, you need to get a collection of catalogs and/or reports to use in the simulation. The easiest way to do this is via the export tool included with PuppetDB, more information can be found here. The export will produce a tar.gz file, which will contain catalogs and reports. The load testing tool only works on directories of catalogs/reports so go ahead and unzip the exported data. When unzipped/untared, there should be a puppetdb-bak/catalogs directory and a puppetdb-back/reports directory. One or both of these directories can be used as input to the load testing tool.

Running the load testing tool

Before running the load testing tool, make sure you have the full path to your example catalogs/reports. You’ll also need a config file (i.e. config.ini) with the host and port information for the PuppetDB instance you are wanting to load test. The config file format is the same as the one PuppetDB uses, but you only need two entries:

  host=<host name here>
  port=<port here>

There is currently no script for running the tool, so you’ll need a command like the one below:

$ /usr/bin/java -cp /usr/share/puppetdb/puppetdb.jar clojure.main -m com.puppetlabs.puppetdb.cli.benchmark --config myconfig.ini --catalogs /tmp/puppetdb-bak/catalogs --runinterval 30 --numhosts 1000 --rand-perc 10

More information on the arguments accepted by the benchmark command are below.

  • --config / -c — Path to the INI file that has the host/port configuration for the PuppetDB instance to be tested
  • --catalogs / -C — Directory containing catalogs to use for testing (probably from a previous PuppetDB export)
  • --reports / -R — Directory containing reports to use for testing (probably from a previous PuppetDB export)
  • --runinterval / -i — Integer indicating the amount of time in minutes between puppet runs for each simulated node, 30 or 60 would be a typical value for this
  • --numhosts / -n — Number of separate hosts that the tool should simulate
  • --rand-perc / -rp — What percentage of catalogs submissions should be changed (i.e. simulating normal/typical catalog changes, as in adding a resource, edge or something similar). More changes to catalogs will cause a higher load on PuppetDB, 10 is a pretty typical change percentage.
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