Agile Deployments with Puppet

Agile Deployments
with Puppet

Gary Larizza
Puppet Labs
@glarizza

Saturday, October 22, 2011

http://bit.ly/garydevops

Agile Deployments
with Puppet

Gary Larizza
Puppet Labs
@glarizza


DevOps
• Culture not tools?

• Release Management?

• http://slidesha.re/itweapon

• http://bit.ly/toolsmatter

• http://slidesha.re/devopstools


Example of
‘poor
deployment’


Developer

Operations


Developer

Production

Operations


Developer

Production

Operations

Staging


Developer

Production

Operations

Staging

Day(s)
Build Time

Developer

Production

Operations

Staging QA

Day(s)
Build Time

Developer

Production

Operations

Staging QA

Day(s) Week(s)
Build Time

Developer

Production

UK
Operations

Staging QA

Day(s) Week(s)
Build Time

Developer

Production

UK
Operations

China
Staging QA

Day(s) Week(s)
Build Time

Developer

Production

UK
Operations

China
Staging QA
Canada
Day(s) Week(s)
Build Time

Developer

Production

UK
Operations

China
Staging QA
Canada
Day(s) Week(s) ???
Build Time

Rampination
http://bit.ly/pconfkeynote


Example of ‘Agile’


Developer

Conﬁguration Production
Data

Operations


Developer

Data

Staging
Operations


Developer

Data

Staging
Operations
10 Minutes
Build Time

Developer

Data

Staging QA
Operations
10 Minutes 1-2 Hours
Build Time

Developer Reach

Developer

Data

Staging QA
Operations
10 Minutes 1-2 Hours 3 Hours
Build Time

What can Ops
learn from Dev?
• Do developers re-write their
code at every step?

• Version control

• Testing frameworks

• Expose ‘settings’ through
conﬁguration data


Infrastructure as Code
with Puppet

• Conﬁgured State vs.
• Deﬁne what needs to be done
Running State
• Model your ideal state with
• Choose
your level of
simple resources
commitment


Resource Abstraction Layer


Resource Abstraction Layer

/usr/bin/yum -y install httpd

Bare
Machine

Puppet’s Task
Provisioning Maintenance
Conﬁgure

Assigned
Base Role
Install


Puppet Resources

service { 'httpd':
  ensure => running,
  enable   => true,
hasstatus => true,
  hasrestart => true,
}


Puppet Resources
Type

service { 'httpd':
  ensure => running,
  enable   => true,
hasstatus => true,
  hasrestart => true,
}


Puppet Resources
Type Title

service { 'httpd':
  ensure => running,
  enable   => true,
hasstatus => true,
  hasrestart => true,
}


Puppet Resources
Type Title

service { 'httpd':
  ensure => running,
  enable   => true,
hasstatus => true,
  hasrestart => true,
}

Attributes

Facter
• Describes aspects of your machine - “facts”

• Facts written in Ruby

• Nice library of existing facts

• Custom facts are easy


Facter
garys-mbp:$ facter
domain => puppetlabs.lan
facterversion => 1.5.8
fqdn => garys-mbp.puppetlabs.lan
hardwaremodel => x86_64
hostname => garys-mbp
kernel => Darwin
macosx_buildversion => 10K549
macosx_productname => Mac OS X
macosx_productversion => 10.6.8
macosx_productversion_major => 10.6
macosx_productversion_minor => 8
<...>


Custom Fact

Facter.add("computername") do
computername

  confine :kernel => :darwin

  setcode('scutil --get ComputerName'.chomp)
scutil ComputerName
end


Custom Fact
Fact name

computername


scutil ComputerName
end


Custom Fact
Fact name

computername


scutil ComputerName
end

Command to Execute


Custom Fact

ENV.each do |key,val|
Facter.add("env_#{key}") do
setcode do
val
end
end
end


Separate Data from Logic

• Conﬁguration Data adapts to environment

• Easy deployment - Puppet modules do not change

• Eliminate SSH access for deployment


Data Separation Examples


Node Inheritance
node common {
$dnsserver = '8.8.8.8'
$searchdomain = 'puppetlabs.vm'
}

node devops inherits common {
$dnsserver = '10.13.1.3'
}

node 'agent.puppetlabs.vm' inherits devops {
file { '/etc/resolv.conf':
content => "search ${searchdomain}n nameserver ${dnsserver}n",
}
}


Data Class in Module
class dns::params {
$dnsserver = '8.8.8.8'
$searchdomain = 'puppetlabs.vm'
}

class dns(
$dnsserver = $dns::params::dnsserver,
$searchdomain = $dns::params::searchdomain
) inherits dns::params {

file { '/etc/resolv.conf':
content => "search ${searchdomain}n nameserver ${dnsserver}n",
}
}


Extlookup
common.csv devops.csv
dnsserver, 8.8.8.8 dnsserver, 10.13.1.2
searchdomain, puppetlabs.vm

$extlookup_datadir = "/etc/puppetlabs/puppet/data"
$extlookup_precedence = [$clientcert, $environment, $architecture, 'common']

node 'agent.puppetlabs.vm' {
include dns
}

class dns {
$dnsserver = extlookup('dnsserver')
$searchdomain = extlookup('searchdomain')
}

External Node Classiﬁer

---
classes:
- dns
parameters:
searchdomain : ‘puppetlabs.vm’
dnsserver : ‘10.13.1.2’


Hiera

• Hierarchal data lookup system

• Structured data backend

• YAML, JSON, and current Puppet state

• http://bit.ly/hieradata


Global Defaults


Global Defaults

Environment


Global Defaults

Environment

Role


Global Defaults

Environment

Role

Resultant Data
Conﬁguration

Global Defaults

---
ntpserver: time.puppetlabs.com
puppetserver: puppet.puppetlabs.com
environment: production


Global Defaults

Environment

---
puppetserver: puppet.puppetlabs.com


Global Defaults

Environment

--- ---
stompserver: stomp-qa.puppetlabs.com puppetserver: puppet.puppetlabs.com
puppetserver: puppet-qa.puppetlabs.com
environment: qa


Global Defaults

Environment

---
environment: qa
stompserver: stomp-qa.puppetlabs.com


Global Defaults

Environment

Role

---
environment: qa


Global Defaults

Environment

Role

--- ---
storeconﬁgs: true puppetserver: puppet-qa.puppetlabs.com
environment: qa


Global Defaults

Environment

Role

---
environment: qa
storeconﬁgs: true


DEMO TIME


Devops Survey

• http://bit.ly/devopssurvey


Code is online

https://github.com/glarizza/puppet-datademo


Gary Larizza

• Twitter: @glarizza

• Email: gary@puppetlabs.com

• Web: http://www.puppetlabs.com


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