Data driven app deploys with chef frontdev

Copyright © 2010 Opscode, Inc - All Rights Reserved
Speaker:
‣ joshua@opscode.com
‣ @jtimberman
‣ www.opscode.com
Joshua Timberman Sr. Solutions Engineer
1
Data Driven App Deploys
Thursday, November 18, 2010

Copyright © 2010 Opscode, Inc - All Rights Reserved 2http://www.ﬂickr.com/photos/anotherphotograph/2100904507/sizes/o/
System administrator
Many environments
Opscode: Training, Services

http://www.ﬂickr.com/photos/timyates/2854357446/sizes/l/
3
Rails Developers?
Java Developers?
Python Developers?

Copyright © 2010 Opscode, Inc - All Rights Reserved 4
Application Deployment

5
tar -x -C /app -f app.tar
rsync ~/dev/app www:/app
cap deploy

Server Conﬁguration
6

Web Servers
Load Balancers
Database Servers
7

8
% vi /etc/mysql/my.cnf
#!/bin/bash
Capﬁle

Chef Client runs on your
systems
10

Clients talk to a Chef
Server
11

Copyright © 2010 Opscode, Inc - All Rights Reserved http://www.ﬂickr.com/photos/peterrosbjerg/3913766224/ 12
We call each system you
conﬁgure a Node

Nodes have Attributes
13
{
"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
14
What Roles or Recipes to apply
in Order

Copyright © 2010 Opscode, Inc - All Rights Reserved 15http://www.ﬂickr.com/photos/laenulfean/374398044/
Nodes have Roles

Copyright © 2010 Opscode, Inc - All Rights Reservedhttp://www.ﬂickr.com/photos/roadsidepictures/2478953342/sizes/o/ 16
Recipes are lists of
Resources

Chef manages
Resources on Nodes
17
cookbook_file
template
service
package
deploy
git
http_request
link
ruby_block
log
bash
execute
remote_file
user

Data bags store
arbitrary data
18

Nodes, Roles, Data
Bags are Searchable
19
% knife search node “role:webserver”
search(:users, “group:sysadmins”)

20
Application Repository
‣ Source
‣ CI / Build
Chef Repository
cider:~/dev/rails-quick-start (ruby-1.9.2-p0)
master ✔ % ls -l
total 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 Rakefile
drwxr-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
Roles
Cookbooks
Application Information
‣ Data Bag!
21

Application Information
Data Bag
JSON
22

Walkthrough
23

{
"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.rb
production.rb
radiant.rb
radiant_database_master.rb
radiant_load_balancer.rb
radiant_run_migrations.rb
Server Roles

Base Role
26
name "base"
description "Base role applied to all nodes."
run_list(
"recipe[apt]",
"recipe[git]",
"recipe[build-essential]",
"recipe[ruby]"
)

Production Role
27
name "production"
description "Nodes in the production
environment."
default_attributes(
"app_environment" => "production"
)

Radiant Role
28
name "radiant"
description "radiant front end application
server."
run_list(
"recipe[mysql::client]",
"recipe[application]"
)

Application Recipe
29
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
end
end
node.run_state.delete(:current_app)

Application Rails Recipe
30
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
31
name "radiant_database_master"
description "Database master for the radiant
application."
run_list(
"recipe[database::master]"
)

Database Master Recipe
32
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
end
end

Radiant Load Balancer Role
33
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
34
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
35
www.opscode.com/chef
IRC 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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