socal piggies-app-deploy

Application Deployment is System State

Joshua Timberman@jtimberman

joshua@opscode.com

Wednesday, February 22, 12

% whoami

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Who are you?

• Developers?

• System administrators?

• DevOps?

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System State

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Configuration Management

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System Integration

http://www.flickr.com/photos/opalsson/3773629074/

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WAT?

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n-Tier Infrastructure

Database Master

Load Balancer

App Server App Server

• Provision

• Configure

• Integrate

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We're hiring!opscode.com/careers/

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Resources

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Declarative interface to system resources

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user "django_app" do shell "/bin/false comment "Django App User" system true action :createend

package "python" do action :installend

python_pip "gunicorn" do action :installend

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Describe *what*.

Not how.

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def install_package(name, version) package_name = "#{name}=#{version}" package_name = name if @is_virtual_package run_command_with_systems_locale( :command => "apt-get -q -y #{expand_options(@new_resource.options)} install #{package_name}", :environment => { "DEBIAN_FRONTEND" => "noninteractive" } )end

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package “python” { yum install pythonapt-get install pythonpacman sync pythonpkg_add -r python

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Recipes

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Ruby Internal Ruby DSL Ruby

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def method_missing(method_symbol, *args, &block) return "lol method_missing"end

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user "django_app" do shell "/bin/false comment "Django App" system trueend

package "python"

python_pip "gunicorn" do action :installend

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Cookbooks

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opscode/cookbooks/python├── README.md├── attributes│   └── default.rb├── metadata.rb├── providers│   ├── pip.rb│   └── virtualenv.rb├── recipes│   ├── default.rb│   ├── package.rb│   ├── pip.rb│   ├── source.rb│   └── virtualenv.rb└── resources ├── pip.rb └── virtualenv.rb

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Roles

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Roles describe nodes.

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name "django_cms"description "django app app server"run_list( "recipe[mysql::client]", "recipe[application]")

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Roles contain recipes

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name "base"description "All nodes have the base role"run_list( "recipe[zsh]", "recipe[sudo]", "recipe[apt]", "recipe[git]", "recipe[build-essential]")override_attributes( :authorization => { :sudo => { :users => ["ubuntu"], :passwordless => true } })

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Application Deployment

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Build your own

• Let's be realistic.

• You own your availability.

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Application Deployment vs...

• Configuration management

• Ad-hoc system administration

• Going against policy

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Package management

• Rpm

• Deb

• Pkgsrc

• Gems

• Eggs

• Not a solved problem.

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git "/srv/django_app" do  repository "git://github.com/me/django_app.git"  reference "master"  action :syncend

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Fabric

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Capistrano

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chef-deploy

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deploy_revision[/srv/django_app]

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deploy_revision "/srv/django_app" do revision "2.0.17" repository "git://github.com/me/django_app.git" user "django_app" group "www-data" before_migrate do requirements_file = "#{release_path}/requirements.txt" execute "pip install -r #{requirements_file}" do cwd release_path end end action :deployend

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Ad-Hoc Deployment

• knife ssh

• capistrano

• fabric (use pychef!)

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require 'chef/knife'require 'chef/search/query'

Capistrano::Configuration.instance.load do  Chef::Knife.new.configure_chef

  def chef_role(name, query = "*:*", options = {})    attr = options.delete(:attribute) || :ipaddress    nodes = Chef::Search::Query.new.search(:node, query)[0].map {|n| n[attr] }    role name, *nodes, options    nodes  endend

https://github.com/cramerdev/capistrano-chefWednesday, February 22, 12

http://pychef.readthedocs.org/en/latest/fabric.html

from fabric.api import env, run, rolesfrom chef.fabric import chef_roledefs

env.roledefs = chef_roledefs()

@roles('web_app')def mytask(): run('uptime')

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Further Resources

• https://us.pycon.org/2012/schedule/presentation/286/ (Noah Kantrowitz)

• http://wiki.opscode.com/display/chef/Build+a+Django+Stack

• http://community.opscode.com/cookbooks/application

• http://pychef.readthedocs.org/en/latest/index.html

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http://www.flickr.com/photos/oberazzi/318947873/

Questions?

Joshua Timbermanjoshua@opscode.com

@jtimberman (twitter, github)lists.opscode.com

irc.freenode.net/chef

Wednesday, February 22, 12