Counting Resource Translation Misses

 Posted on February 20, 2018  |  6 minutes  |  1113 words  |  Felix Frank

This is another post in the wake of CfgMgmtCamp 2018, where the mgmt hack room saw lively discussion that inspired some new ideas as well as reminding me of some ideas I had last year, but didn’t manage to implement or describe yet. This post is about one of those. Recap Even though we now have a slick Puppet module that allows early adopters and testers to run mgmt from Puppet manifest code, our ability to run existing, complex manifests is somewhat limited. [Read More]
puppet  mgmt  catalog  graph 

Thinking About Migration From Puppet To Mgmt

 Posted on February 13, 2018  |  10 minutes  |  1930 words  |  Felix Frank

Abstract We have already implemented a way to replace the Puppet Agent with the mgmt engine. It can run a graph on a machine that is derived from the machine’s Puppet catalog. The user is limited to mgmt features that can be expressed in Puppet’s DSL in this scenario. In order to unlock mgmt’s full potential, the user will have to rewrite all their Puppet code in mgmt’s language. This presents a significant challenge for maintainers of larger Puppet code bases that are actively used and evolving. [Read More]
puppet  mgmt  catalog  graph 

Edging It All In

 Posted on July 12, 2016  |  10 minutes  |  2104 words  |  Felix Frank

The mgmt translator for puppet catalogs was truly created from the bottom up. We started with a few resource types, and the relationships between the translated resources. This falls short for many catalogs, of course, because dependencies must often put whole classes in order, or do the same for instances of defined types. Allowing the translator module to accept such macro-dependencies was not much work, but it did require some intense digging. [Read More]
puppet  mgmt  class  define  stage  dependency  edge  graph  catalog 

Puppet Powered Mgmt

 Posted on June 19, 2016  |  5 minutes  |  855 words  |  Felix Frank

Recently, I wrote a veritable deep-dive on mgmt’s new Puppet integration code, but didn’t include a good overview of how the new features look in practice. Here we go. The original interface If you recall, mgmt has no configuration language of its own. With its highly dynamic and distributed nature, it’s also not a good fit for the languages that established tools such as puppet and chef use. (Please note that Salt has no language either, and Ansible relies on a weird YAML hybrid). [Read More]
puppet  catalog  compiler  mgmt  graph 

From Catalog To Mgmt

 Posted on February 18, 2016  |  16 minutes  |  3300 words  |  Felix Frank

Have you heard of mgmt yet? It’s (currently) a prototype config management engine written by James and brings some exciting new ideas to the table, building on the proven concepts of Puppet. You should probably read up on it right now. James gave the inaugural demo at ConfigMgmtCamp 2016 in Gent, Belgium, and mentioned that he can picture a sort of “transpiler” that will create resource graphs from Puppet manifest code. [Read More]
puppet  catalog  compiler  mgmt  graph 

Debugging Rspec Of Catalog Application

 Posted on March 23, 2015  |  2 minutes  |  217 words  |  Felix Frank

Running catalogs from RSpec tests is tricky. There are some examples in the existing test base that help doing it. One basic pattern goes like this: describe SomeThing let(:catalog) { Puppet::Resource::Catalog.new } context "when doing something else" do let(:resource) do Puppet::Type::MyType.new( :ensure => :present, :param => 'value', ) end it "behaves a certain way" do catalog.add_resource(resource) catalog.apply expect( check_result() ).to be_truthy end end end Of course, such tests can fail for various reasons. [Read More]
puppet  rspec  catalog  logs  debug