Shell's Kitchen: Infrastructure As Code (Webexpo 2012)

Shell’s Kitchen
Ano, Chefe!

Karel Minařík & Vojtěch Hýža

Vojtěch Hýža Karel Minařík
Social Insider elasticsearch
@vhyza @karmiq
Shell’s Kitchen

2 separate deployments
2 dev|ops
> 20 servers in EC2

We’re hiring! We’re hiring!

Vojtěch Hýža Karel Minařík
Social Insider elasticsearch.com
@vhyza @karmiq
Shell’s Kitchen

1 README 15 mins

2 “Hello World” 15 mins

3 “Hello Cloud” 30 mins

Shell’s Kitchen

“Enable the reconstruction of the business
from nothing but a source code repository,
an application data backup, and bare metal
resources”

— Jesse Robins, Opscode

Shell’s Kitchen

“SSH and a for loop
is not a solution”
Luke Kanies, inventor of Puppet

2
9 7
3 .1 -
. 18 s u
1 29 udo
4. s
17 er "
in erv
v e r @$ s y es tart p
s er ser -- res r/
a
e a
f or h $u pdat inx al/v
ss m
u ng oc

Infrastructure As Code
Automation
Repeatability
Agility
Scalability
Disaster Recovery
Stephen Nelson-Smith, Test-Driven Infrastructure with Chef, p. 3-4 Shell’s Kitchen

# Install Nginx from package
#
package "nginx"

# Create user and group for Nginx
#
user node[:nginx][:user] do
comment "Nginx User"
system true
add .
shell "/bin/false"
end

group node[:nginx][:user] do
members ['ec2-user', node[:nginx][:user]]
end

# Create service for Nginx (/sbin/service nginx)
#
service "nginx" do
supports :status => true, :restart => true, :reload => true
action [ :enable, :start ]
end

# Create log directory
#
directory node[:nginx][:log_dir] do
mode 0755
owner 'root'
recursive true
end

# Create Nginx main configuration file
#
template "nginx.conf" do
path "#{node[:nginx][:dir]}/nginx.conf"
source "nginx.conf.erb"
owner 'root'
mode 0644

What is Chef?
An open-source framework, tool and API for
infrastructure provisioning and management, maintained
and supported by Opscode.
You can use it to maintain a single server for your
Wordpress blog, or a cluster of machines in production
with equal ease.
You can re-use knowledge and code from the larger
#devops community and use the tooling provided by
surrounding ecosystem.

Chef Concepts

database
database-‐1

Servers
Roles Nodes

directory "/tmp/something" do
owner "root"
group "root"
mode "0755"
action :create

{version: "1"} end

Attributes Recipes

Templates, Data Bags, Static files, Libraries, ...

Cookbooks contains resources & providers
Shell’s Kitchen

Demo 1: “Hello World” with Chef Solo
http://git.io/chef-solo-hello-world

1. Install Nginx
2. Add a simple website for Nginx
3. Use node attributes in the template
4. Launch the node in Amazon EC2

Shell’s Kitchen

Chef Server

Chef $ chef-‐client

Server database-‐1

Servers
Nodes

…"
* "
ata
Cookbooks
Roles

e:d
Nodes

nam
Data bags
$ knife status

sh
Full Text Search
… $ knife search node …

e s
$ knife cookbook upload …

nif
$ k
Cookbooks Workstation

Shell’s Kitchen

Load Balancer

Application 1 Application 1 Application 1

Database elasticsearch A
Redis | PostgreSQL

elasticsearch B

Shell’s Kitchen

Demo 2: “Hello Cloud” with Chef Server
http://git.io/chef-hello-cloud
‣ Deploy a Ruby On Rails application on EC2 from a “zero state”
‣ 1 load balancer (HAproxy), 3 application servers (Thin+Nginx)
‣ 1 database node (PostgreSQL, Redis)
‣ 2 elasticsearch nodes
‣ Install Ruby 1.9.3 via RVM
‣ Clone the application from (forked) GitHub repository
‣ init.d scripts and full configuration for every component
‣ Restore data from backup (database and search index)
‣ Monitor every part of the stack
‣ Under 30 minutes
Shell’s Kitchen

INFRASTRUCTURE AS CODE, DEVOPS, CHEF

Resources

http://wiki.opscode.com/display/chef/Guides

http://wiki.opscode.com/display/chef/Resources

http://wiki.opscode.com/display/chef/Chef+Solo

http://wiki.opscode.com/display/chef/Architecture+Introduction

http://agilesysadmin.net/ec2-outage-lessons

http://www.aosabook.org/en/puppet.html

http://devopsanywhere.blogspot.it/2011/10/puppet-vs-chef-fight.html

http://www.opinionatedprogrammer.com/2011/06/chef-solo-tutorial-managing-a-single-server-with-chef/

http://blog.nistu.de/2012/03/04/reusability-in-configuration-management-systems/

http://www.slideshare.net/infochimps/chefconf-2012-13016159/23

http://vagrantup.com/v1/docs/provisioners.html

Shell's Kitchen: Infrastructure As Code (Webexpo 2012)

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