PUPPET MODULES: A HOLISTIC APPROACH
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1 PUPPET MODULES: A HOLISTIC APPROACH PuppetCamp Geneva 2012 Alessandro Franceschi
2 LAB Meet Puppet. Managed the Bank of Italy webfarm First generation of Lab42 Puppet Modules Multi OS support and standardization of the modules A redesigned and coherent Example42 Module set Puppet Modules Standards and Interoperability (PuppetCamp Europe Belgium) Re-Use your Modules! (PuppetCamp San Francisco) Introducing Puppi Puppi: Puppet strings to the shell (PuppetCamp Europe Amsterdam) Example42 Next Gen modules Developing IT Infrastructures with Puppet (CodeMotion Rome)
3 WE ALL LOVE AND USE PUPPET FOR Systems Configuration (Automatic) Monitoring based on specific tools Facts based Inventory Manage, at times, Applications deployments Infrastructure Orchestration (coupled with MCollective)
4 WE LIKE TO EXTEND PUPPET TO Abstract Automatic Monitoring (whatever the tool) Automatic Firewalling Standardize Applications deployments Enrich Systems Inventory Shell Extension ( Puppet Knowledge to the CLI ) Provide a coherent and integrated modules ecosystem
5 PUPPET MODULES MANTRAS Data Separation Configuration data is defined outside the module (or Puppet manifests) Module s behavior is managed via APIs Reusability ReUse the same module in different shops Customize its behavior without changing its code Do not force how configurations are provided Standardization Follow PuppetLabs layout guidelines (puppet-lint) Have a coherent, predictable and intuitive interface Provide contextual documentation (puppet-doc) Interoperability Limit dependencies. Allow modules cherry picking Be self contained, do not interfere with other modules resources Cross Operating System support Provide sensible defaults for different OS Allow easy implementation of support of new OS
6 EXAMPLE42 NEXT GEN Coherent and Standardized structure Best Practices module design (with some tweaks...) Easily extendable Cross OS support Complete API exposure via parameters Extreme Customizations options Alternative Data Separation options Complete Decommissioning features Optional Automatic Monitoring Abstraction Optional Automatic Firewalling Optional Puppi support to enhance the CLI experience Exhaustive PuppetDoc documentation Integrated Rspec-Puppet tests Code Puppet-Lint compliant Quick module scaffolding based on different templates... not exactly easy to read...
7 BASIC USAGE One Module. One Application. One main class. Install openssh with default settings: Equivalent to: include openssh Default behavior: Install package Run and enable service Do not alter configurations
8 DATA INPUT ALTERNATIVES Set (Top Scope/ENC) variables and include classes: $::openssh_template = 'site/openssh/openssh.conf.erb' include openssh Use Hiera: hiera( openssh_template ) include openssh Use Parametrized Classes: template => 'site/openssh/openssh.conf.erb', Happily mix different patterns: $::monitor = true $::monitor_tool = [ 'nagios', 'munin', 'puppi' ] template => 'site/openssh/openssh.conf.erb',
9 Disable openssh service: disable => true DECOMMISSIONING Deactivate openssh service only at boot time: disableboot => true Useful when a service is managed by another tool (ie: a cluster suite) Remove openssh (package and files): absent => true Monitoring and firewalling resources removal is automatically managed
10 MANAGE BEHAVIOR Enable Auditing: audit_only => true, # Default: false No changes to configuration files are actually made and potential changes are audited Manage Service Autorestart: service_autorestart => false, # Default: true No automatic service restart when a configuration file / dir changes Manage Software Version: class { 'foo': version => 1.2.0, # Default: unset Specify the package version you want to be installed. Set => latest to force installation of latest version
11 CUSTOMIZE: CONFIGURATION FILE Provide Main Configuration as a static file... source => puppet:///modules/site/ssh/sshd.conf, an array of files looked up on a first match logic... source => ["puppet:///modules/site/ssh/sshd.conf-${fqdn", "puppet:///modules/site/ssh/openssh.conf"], As an erb template: template => site/ssh/sshd.conf.erb, Config File Path is defined in params.pp (can be overriden): config_file = > /etc/ssh/sshd_config,
12 CUSTOM OPTIONS With templates you can provide an hash of custom options: template => site/ssh/sshd.conf.erb, options => { 'LogLevel' => 'INFO', 'UsePAM' => 'yes',, Alternative ways to use the options hash in an erb template: Direct but not safe (you must always provide all the used options) UsePAM <%= options['usepam'] %> Failsafe with defaults (verbose but safe) <% if scope.lookupvar("openssh::options['usepam']") then -%> UsePAM <%= options['usepam'] %> <% else -%> UsePAM no <% end -%> Show what you have (useful for config files has defaults for every option) <% scope.lookupvar("openssh::options").sort_by { key, value key.each do key, value -%> <%= key %> <%= value %> <% end -%>
13 CUSTOMIZE: CONFIGURATION DIR You can manage the whole Configuration Directory: source_dir => puppet:///modules/site/ssh/sshd/, This copies all the files in lab42/files/ssh/sshd/* to local config_dir You can purge any existing file on the destination config_dir which are not present on the source_dir path: source_dir => puppet:///modules/site/ssh/sshd/, source_dir_purge => true, # default is false WARNING: Use with care Config Dir Path is defined in params.pp (can be overriden): config_dir = > /etc/ssh,
14 CUSTOMIZE: CUSTOM CLASS Provide added resources in a Custom Class: my_class => site/my_openssh, This autoloads: site/manifests/my_openssh.pp Custom class can stay in your site module: class site::my_openssh { file { "motd": path => "/etc/motd", content => template("site/openssh/motd.erb"), You hardly need to inherit openssh: there are parameters for everything Do not call your class site::openssh, naming collisions could happen.
15 CUSTOMIZE: PATHS AND NAMES Customize Application Parameters. An example: Use the puppet module to manage pe-puppet! class { 'puppet': template => 'lab42/pe-puppet/puppet.conf.erb', package => 'pe-puppet', service => 'pe-puppet', service_status => true, config_file => '/etc/puppetlabs/puppet/puppet.conf', config_file_owner => 'root', config_file_group => 'root', config_file_init => '/etc/sysconfig/pe-puppet', process => ruby, process_args => puppet, process_user => root, config_dir => '/etc/puppetlabs/puppet/', pid_file => '/var/run/pe-puppet/agent.pid', log_file => '/var/log/pe-puppet/puppet.log', log_dir => '/var/log/pe-puppet',
16 EXTEND: MONITOR Manage Abstract Automatic Monitoring: monitor => true, monitor_tool => [ nagios, puppi, monit ], monitor_target => $::ip_addess # Default Monitoring is based on these parameters defined in params.pp: port => 22, protocol => tcp, service => ssh[d], # According to OS process => sshd, process_args =>, process_user => root, pid_file => /var/run/sshd.pid, Abstraction is managed in the Example42 monitor module Here connectors for different monitoring tools are defined and can be added (also using 3rd party modules).
17 EXTEND: FIREWALL Manage Automatic Firewalling (host based): firewall => true, firewall_tool => iptables, firewall_src => ' /8', firewall_dst => $::ipaddress_eth1, # Default is $::ipaddress Firewallig is based on these parameters defined in params.pp: port => 22, protocol => tcp, Abstraction is managed in the Example42 firewall module Currently only the iptables firewall_tool is defined, it uses Example42 iptables module to manage local iptables rules
18 EXTEND: PUPPI Manage Puppi Integration: puppi => true, # Default: false puppi_helper => standard # Default The Puppi module is a prerequisite for all Example42 modules Is required because it provides common libs, widely used in the modules BUT the actual puppi integration is optional (and disabled by default) Puppi integration allows CLI enrichment commands like: puppi info openssh puppi log openssh puppi check openssh Note: puppi support for info/log commands for NextGen modules is under development Puppi helpers allow you to customize Puppi behavior
19 PARAMS_LOOKUP EVERYWHERE Each parameter on a NextGen class is passed via the params_lookup function class openssh ( [...] # openssh module specific parameters... $my_class = params_lookup( 'my_class' ), $source = params_lookup( 'source' ), $source_dir = params_lookup( 'source_dir' ), $source_dir_purge = params_lookup( 'source_dir_purge' ), $template = params_lookup( 'template' ), $service_autorestart = params_lookup( 'service_autorestart', 'global' ), $options = params_lookup( 'options' ), $version = params_lookup( 'version' ), $absent = params_lookup( 'absent' ), $disable = params_lookup( 'disable' ), $disableboot = params_lookup( 'disableboot' ), $monitor = params_lookup( 'monitor', 'global' ), $monitor_tool = params_lookup( 'monitor_tool', 'global' ), $monitor_target = params_lookup( 'monitor_target', 'global' ), [...] # Other common parameters ) inherits openssh::params { [...] Each class provides a set of different kind of params that: Are module specific (no one defined in this openssh module) Allow customizations (my_class, source, template...) Affect module s behavior (absent, disable, service_autorestart, audit_only...) Manage extensions (monitor, monitor_tool, firewall, puppi...) Define application parameters (port, config_file, process, package... )
20 DEFAULTS IN PARAMS.PP Each module has a params class where defaults are set for different OS class openssh::params { ### Application related parameters $package = $::operatingsystem? { default => 'openssh-server', $service = $::operatingsystem? { /(?i:debian Ubuntu Mint)/ => 'ssh', default => 'sshd', $process = $::operatingsystem? { default => 'sshd', [...] $port = '22' $protocol = 'tcp' # General Settings $my_class = '' $source = '' $source_dir = '' $source_dir_purge = '' [...] ### General module variables that can have a site or per module default $monitor = false $monitor_tool = '' $monitor_target = $::ipaddress $firewall = false $firewall_tool = '' $firewall_src = ' /0' [...]
21 PARAMS_LOOKUP ORDER params_lookup is a function provided by the Puppi module It allows data to be defined in different ways: Via Hiera, if available As Top Scope variable (as provided by External Node Classifiers) Via defaults set in the module s params class The global argument is used to define site_wide behavior Example: class { openssh : monitor => true # If there s a direct param that s the value # Otherwise, If Hiera is available: hiera( monitor ) # If global lookup is set hiera( openssh_monitor ) # A specific value overrides the global one # If variable is still not evaluated: $::monitor # If global lookup is set $::openssh_monitor # If present, overrides $::monitor $openssh::params::monitor # Module s defaults are used as last option
22 DOWNLOAD Example42 Puppet Modules Site: GitHub repositories: Git Download: git clone -r example42/puppet-modules-nextgen Note on GitHub repos: puppet-modules-nextgen contains only NextGen modules (as git submodules) puppet-modules contains both NextGen and older modules puppet-* are the single NextGen modules
23 ONE MORE THING... How to make a NextGen module git clone -r cd puppet-modules-nextgen Example42-tools/module_clone.sh This script creates a skeleton for a new module based on different Example42 foo module templates. Run it from the directory that contains the foo module (moduledir). By default it uses the "foo" module as template. Specify -t <source_module> to use a different template. Example: Example42-tools/module_clone.sh -t foo_webapp Source module template is foo Enter the name of the new module based on foo: mynewmodule Edit mynewmodule/manifests/params.pp to manage support for different OS A new, basic, NextGen module based on the foo standard template is done. Add features and application specific resources to enrich it
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