Data driven app deploys with chef frontdev

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Speaker:

‣ [email protected]‣ @jtimberman‣ www.opscode.com

Joshua Timberman Sr. Solutions Engineer

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Data Driven App Deploys

Thursday, November 18, 2010

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mailto:[email protected]

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System administrator

Many environments

Opscode: Training, Services


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Rails Developers?Java Developers?Python Developers?




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Application Deployment




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tar -x -C /app -f app.tarrsync ~/dev/app www:/appcap deploy



Server Configuration

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Web ServersLoad BalancersDatabase Servers




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% vi /etc/mysql/my.cnf#!/bin/bashCapfile


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Chef Client runs on your systems



Clients talk to a Chef Server


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We call each system you configure a Node



Nodes have Attributes

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{ "kernel": { "machine": "x86_64", "name": "Darwin", "os": "Darwin", "version": "Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386", "release": "10.4.0" }, "platform_version": "10.6.4", "platform": "mac_os_x", "platform_build": "10F569", "domain": "local", "os": "darwin", "current_user": "jtimberman", "ohai_time": 1278602661.60043, "os_version": "10.4.0", "uptime": "18 days 17 hours 49 minutes 18 seconds", "ipaddress": "10.13.37.116", "hostname": "cider", "fqdn": "cider.local", "uptime_seconds": 1619358 }

Kernel info!

Platform info!

Hostname and IP!



Nodes have a Run List

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What Roles or Recipes to applyin Order


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Nodes have Roles


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Recipes are lists of Resources


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Chef manages Resources on Nodes

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cookbook_file

template

service

package

deploy

git

http_request

link

ruby_block

logbash

execute

remote_file

userThursday, November 18, 2010


Data bags store arbitrary data



Nodes, Roles, Data Bags are Searchable

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% knife search node “role:webserver”

search(:users, “group:sysadmins”)




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Application Repository‣ Source‣ CI / Build

Chef Repositorycider:~/dev/rails-quick-start (ruby-1.9.2-p0)master ✔ % ls -ltotal 16-rw-r--r-- 1 jtimberman staff 3521 Nov 5 13:09 README.md-rw-r--r-- 1 jtimberman staff 2171 Nov 5 13:09 Rakefiledrwxr-xr-x 3 jtimberman staff 102 Nov 5 13:09 certificates/drwxr-xr-x 3 jtimberman staff 102 Nov 5 13:09 config/drwxr-xr-x 26 jtimberman staff 884 Nov 12 08:16 cookbooks/drwxr-xr-x 4 jtimberman staff 136 Nov 5 13:25 data_bags/drwxr-xr-x 9 jtimberman staff 306 Nov 12 08:16 roles/



Chef Repository

RolesCookbooksApplication Information

‣ Data Bag!



Application Information

Data BagJSON



Walkthrough



{ "id": "radiant", "server_roles": [ "radiant" ], "type": { "radiant": [ "rails", "unicorn" ] }, "database_master_role": [ "radiant_database_master" ], "repository": "git://github.com/radiant/radiant.git", "revision": { "production": "0.9.1" },



base.rbproduction.rbradiant.rbradiant_database_master.rbradiant_load_balancer.rbradiant_run_migrations.rb

Server Roles



Base Role

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name "base"description "Base role applied to all nodes."run_list( "recipe[apt]", "recipe[git]", "recipe[build-essential]", "recipe[ruby]")



Production Role

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name "production"description "Nodes in the production environment."default_attributes( "app_environment" => "production")



Radiant Role

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name "radiant"description "radiant front end application server."run_list( "recipe[mysql::client]", "recipe[application]")



Application Recipe

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search(:apps) do |app| (app["server_roles"] & node.run_list.roles).each do |app_role| app["type"][app_role].each do |thing| node.run_state[:current_app] = app include_recipe "application::#{thing}" end endend

node.run_state.delete(:current_app)



Application Rails Recipe

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deploy_revision app['id'] do revision app['revision'][node.app_environment] repository app['repository'] user app['owner'] group app['group'] deploy_to app['deploy_to'] environment 'RAILS_ENV' => node.app_environment action app['force'][node.app_environment] ? :force_deploy : :deploy

...



Radiant Database Master Role

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name "radiant_database_master"description "Database master for the radiant application."run_list( "recipe[database::master]")



Database Master Recipe

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search(:apps) do |app| (app['database_master_role'] & node.run_list.roles).each do |dbm_role| app['databases'].each do |env,db| if env =~ /#{node[:app_environment]}/ root_pw = node["mysql"]["server_root_password"] mysql_database "create #{db['database']}" do host "localhost" username "root" password root_pw database db['database'] action [:create_db] end end end endend



Radiant Load Balancer Role

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name "radiant_load_balancer"description "radiant load balancer"run_list( "recipe[haproxy::app_lb]")override_attributes( "haproxy" => { "app_server_role" => "radiant" })



Haproxy App Load Balancer Recipe

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pool_members = search("node", "role:#{node['haproxy']['app_server_role']} AND app_environment:#{node['app_environment']}") || []

template "/etc/haproxy/haproxy.cfg" do source "haproxy-app_lb.cfg.erb" owner "root" group "root" mode 0644 variables :pool_members => pool_members notifies :restart, resources(:service => "haproxy")end



Resources/Questions

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www.opscode.com/chefIRC and Mailing lists‣ irc.freenode.net #chef‣ lists.opscode.com

Twitter:‣ @opscode, #opschef‣ @jtimberman

Questions?


Data driven app deploys with chef frontdev

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