Design Patterns in Configuration Management - Part 1

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Design Patterns Conﬁguration Management

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broader strokes

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angry page

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Why not?

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Step Back

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Data Driven Infrastructure

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There is System One

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Modularity

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Self Authoritative

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Must self-correct

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Utopia

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James Fryman

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• Code Examples • Background http://git.io/in341A

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Language

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Activity-on-Node

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State Machine

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Provisioning Maintenance Process Ready for Master Sync Slave Ready Tombstone Backup Lifecycle

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Self-Correct Not Serving Log Remove from LB Cycle Service Escalate Assets Missing Ready Validate FS Conﬁguration Success

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Proxy Pattern

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define statemachine::set( $ensure = present, $base = $name, $state = undef, $backend = $statemachine::config::backend, ) { if $state { ensure_resource($backend, $name, { "ensure" => $ensure, "base" => $base, "state" => $state, }) } else { statemachine::log { "Unable to set state for $ {base}. Missing state. Skipping...": } } }

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class statemachine::config ( $logger = 'statemachine::logger::console', $backend = 'statemachine::backend::local', ) { validate_string($logger, $backend) ! File { ensure => file, owner => 'root', group => 'root', mode => '0755', } ! file { '/etc/statemachine': ensure => directory, } file { '/etc/facter/facts.d/statemachine': source => 'puppet:///modules/statemachine/etc/facter/facts.d/statemachine', } file { '/usr/local/bin/statemachine': source => 'puppet:///modules/statemachine/usr/local/bin/statemachine', } }

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define statemachine::backend::local( $ensure = present, $base = $name, $state = undef, ) { include statemachine::backend::local::config $settings = $statemachine::backend::local::config::settings validate_hash($settings) ! validate_re($ensure, '^(absent|present)$') validate_string($base, $state) ! $state_file = regsubst($base, '::', '_', 'G') ! file { "${settings['base_dir']}/${state_file}": ensure => $ensure, owner => 'root', group => 'root', mode => '0644', content => "${state}\n", } }

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statemachine { 'frymanet::base': states => [ 'provisioning', 'config', 'ready', ], } Declare

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State Machine

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State Machine Automatically via Facts Set via ChatOps In response to global state

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Proxy Pattern

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Proxy Pattern statemachine::set statemachine::backend statemachine::backend::local

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statemachine::set statemachine::backend statemachine::backend::local database::new database::backend postgres::adapter::new Factory Pattern

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No Assembly Required

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No Assembly Required

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Problem 1: Unable to wire in a node to provide service. Too Many Choices

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Self Authoritative

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Ladder - Convention over Conﬁguration

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-‐-‐-‐ :base: frymanet::base :hierarchy: -‐ platform/%{::virtual} -‐ platform/%{::productname} -‐ platform/%{::operatingsystem} -‐ platform/%{::operatingsystem}/%{::lsbdistcodename} -‐ platform/%{::cloud} -‐ platform/%{::datacenter} -‐ platform/%{::datacenter}/%{::operatingsystem} Stacks

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require 'yaml' ! module Puppet::Parser::Functions newfunction(:find_ladder_rungs, :type => :rvalue, :doc => 'Find all manifests eligible for import based on a ladder stack') do |args| load_stack = args[0] stack_config = "#{lookupvar('ladder::config::conf_dir')}/#{load_stack}.yaml" module_path = File.expand_path('..', Puppet::Module.find('ladder', compiler.environment.to_s).path) manifests = [] ! # Recursively render the rung and populate with real values def expand_rung(rung) rung.sub!(/%{(.*)}/) { |match| lookupvar(match.first) } rung.match(/%{(.*)}/) ? expand_rung(rung) : rung.gsub(/\//, '::') end ! if File.exists? stack_config stack = YAML.load_file "#{module_path}/#{stack_config}" ! stack[:hierarchy].each do |rung| rung_lookup = "#{stack[:base]}::#{expand_rung(rung)}" ! if Puppet::Module.find(rung_lookup, compiler.environment.to_s) manifests << rung_lookup end end end !