Puppet Agent fails sporadically, with either timeout or "Could not find class" error

Posted by smokris on Server Fault See other posts from Server Fault or by smokris
Published on 2012-04-07T02:23:44Z Indexed on 2012/04/07 5:33 UTC
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I have puppet master running on a Xen dom0, and 3 domUs syncing to it via an hourly crontab puppet agent --test.

About 80% of the time, the puppet agent --test completes successfully:

info: Retrieving plugin
info: Caching catalog for test3
info: Applying configuration version '1333319732'
notice: Finished catalog run in 5.08 seconds

The other 20% of the time, it fails midway, with errors such as the following:

err: Could not retrieve catalog from remote server: Error 400 on SERVER:
     Could not find class iptables for test1 at /etc/puppet/manifests/site.pp:1 on node test1
warning: Not using cache on failed catalog
err: Could not retrieve catalog; skipping run

or

info: Retrieving plugin
info: Caching catalog for test2
info: Applying configuration version '1333319732'
notice: Finished catalog run in 24.73 seconds
err: Could not send report: Error 500 on SERVER: 

Internal Server Error

private method `gsub' called for WEBrick::HTTPStatus::RequestTimeout:Class

 WEBrick/1.3.1 (Ruby/1.8.5/2006-08-25) OpenSSL/0.9.8e-rhel5 at
 puppet:8140

or

info: Retrieving plugin
err: Could not retrieve catalog from remote server: execution expired
warning: Not using cache on failed catalog
err: Could not retrieve catalog; skipping run

or

info: Retrieving plugin
info: Caching catalog for test3
info: Applying configuration version '1333319732'
notice: Finished catalog run in 9.47 seconds
err: Could not send report: Error 408 on SERVER: Request Timeout 

During this time, I've not made any changes to the Puppet configuration — it just sporadically fails.

I'm running puppet-2.7.12 on CentOS, and followed the setup instructions described on http://docs.puppetlabs.com/learning/agent_master_basic.html.

Any ideas about how I can troubleshoot this?

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