Socal piggies-app-deploy

Application Deployment is System State

Joshua Timberman
@jtimberman
joshua@opscode.com

Wednesday, February 22, 12

% whoami


Who are you?

• Developers?
• System administrators?
• DevOps?


System State


Configuration Management


System Integration

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


WAT?


n-Tier Infrastructure

Load Balancer

App Server { { App Server
•
•
•
Provision
Configure
Integrate

Database Master


We're hiring!
opscode.com/careers/


Resources


Declarative interface to
system resources


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

package "python" do
action :install
end

python_pip "gunicorn" do
action :install
end

Describe *what*.

Not how.


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


package “python”
{ yum install python
apt-get install python
pacman sync python
pkg_add -r python


Recipes


Ruby Internal Ruby DSL Ruby


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


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

package "python"

python_pip "gunicorn" do
action :install
end

Cookbooks


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

Roles


Roles describe nodes.


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


Roles contain recipes


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
}
}
)

Application Deployment


Build your own

• Let's be realistic.
• You own your availability.


Application Deployment vs...

• Configuration management
• Ad-hoc system administration
• Going against policy


Package management

• Rpm
• Deb
• Pkgsrc
• Gems
• Eggs
• Not a solved problem.

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


Fabric


Capistrano


chef-deploy


deploy_revision[/srv/django_app]


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 :deploy
end


Ad-Hoc Deployment

• knife ssh
• capistrano
• fabric (use pychef!)


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
  end
end

https://github.com/cramerdev/capistrano-chef

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

env.roledefs = chef_roledefs()

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

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

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


Questions?

Joshua Timberman
joshua@opscode.com
@jtimberman (twitter, github)
lists.opscode.com
irc.freenode.net/chef

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

Socal piggies-app-deploy

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