Hello everyone,
I'm trying to hook NewRelic into the Puppet agent. Why? Because I'm pretty
positive at this point that the metrics Dashboard reports are not accurate
/ incomplete and I can't really split out those metrics in stuff like
'which commands take too long' or 'how long am I waiting on the network'
and so forth.
Now, I've been able to hook NewRelic into the Puppet agent by changing
/usr/bin/puppet to look like this:
> #!/usr/bin/ruby1.8
> require 'rubygems'
> require 'newrelic_rpm'
> require 'new_relic/agent/instrumentation/controller_instrumentation'
> NewRelic::Agent.manual_start
> include NewRelic::Agent::Instrumentation::ControllerInstrumentation
> perform_action_with_newrelic_trace(:name => "PuppetAgentRun:
> #{`hostname`}", :category => :task) do
> require 'puppet/util/command_line'
> Puppet::Util::CommandLine.new.execute
> end
This (and a newrelic.yml) gets me some basic information in NewRelic's
Background Tasks showing data like this:
Category Segment % Time Avg calls (per task call) Avg time (ms)
> OtherTransaction Object/PuppetAgentRun: nl12s0020 50.2 1.0 28,540
> External Net::HTTP[nl14s0008-vm5.healthcare.nedap.local]: POST 37.1 2.0
> 21,092
> External Net::HTTP[nl14s0008-vm5.healthcare.nedap.local]: GET 8.8 190
> 5,003
> External Net::HTTP[nl14s0008-vm5.healthcare.nedap.local]: PUT 3.8 2.0
> 2,160
> External Net::HTTP[nl14s0008-vm5.healthcare.nedap.local]: HEAD 0.1 2.0
> 28.4
Though interesting it still doesn't tell me much so I want to do something
like this:
> require 'puppet/configurer/downloader'
> Puppet::Configurer::Downloader.class_eval do
> include NewRelic::Agent::MethodTracer
> add_method_tracer :evaluate
> end
However, this is where it goes wrong. At that point, agents start
complaining:
> /usr/lib/ruby/1.8/puppet/indirector.rb:6: uninitialized constant Puppet
> (NameError)
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in
> `gem_original_require'
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
> from /usr/lib/ruby/1.8/puppet/ssl/host.rb:1
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in
> `gem_original_require'
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
> from /usr/lib/ruby/1.8/puppet/network/http_pool.rb:1
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in
> `gem_original_require'
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
> from /usr/lib/ruby/1.8/puppet/configurer.rb:4
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in
> `gem_original_require'
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
> from /usr/lib/ruby/1.8/puppet/configurer/downloader.rb:1
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in
> `gem_original_require'
> from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
> from /usr/bin/puppet:9
Now, one would think that a 'require puppet' would fix it but then
everything breaks with errors like this:
> err: /Stage[main]/Ntp/File[/etc/ntp.conf]: Could not evaluate: Could not
> retrieve information from environment production source(s)
> puppet:///modules/ntp/ntp.conf at
> /etc/puppet/environments/production/modules/ntp/manifests/init.pp:19
This goes on and on and causes failed runs, so we tried stuff like 'require
puppet/util' or 'require puppet/util/plugin' but eventually we always end
up with a error similar to:
> uninitialized constant Puppet (NameError)
It would seem that Puppet code loads a lot of stuff itself instead of
letting Ruby handle it and at this point I'm at a loss. How do I hook into
Puppet classes and functions in a way that doesn't break the agent and
allows me / NewRelic to see what is going on?
Kind regards,
--
Daniele Sluijters
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