Download - Systems building Systems: A Puppet Story
Systems Building SystemsA Puppet Story
What is Puppet? Language Parser
Client/Server
Resource Abstraction
A few other things...
LukeKaniesRecovering Sysadmin
One Goal:Revolutionize System Administration
What is a sysadmin?
Not Exactly Modern
Do tools have to suck?
Say What?!??
Everything the SameEverything Distinct
“Best Practices”
Don’t look at me... I wasn’t the last one to touch it...
SSH Cfengine ?
Bad product,hungry Luke
SSH Cfengine ?
SSH Cfengine ?
You can either easily manage complex systems at scale...
You can either easily manage complex systems at scale...
Or you can’t...
Who’s using Puppet?
“...at Google we're currently using Puppet
to manage close to 6,000 Macs, and it's likely our deployment
will expand dramatically beyond
that....”
Competitive Advantage
People are finally figuring out puppet and how it gets you
to the pub by 4pm. Note that I've been at this pub since
2pm.-- Jorge Castro
Enter Puppet...
Configuration Is Declarative Code
Semantics Matter
Reproducible
Shareable
Maintainable
Extensible
Developer Sysadmin
Developer Sysadmin
Three people
Programming SysAdmin
Low-level, non-portable Assembly commands
and files
Abstract, portable C* Resources
An Analogy
* For small values of abstract
Portable ResourcesThis:
Portable Resources
Becomes:
This:
Portable Resources
Becomes:
This:
Portable Resources
Becomes:
This:
Portable Resources
Becomes:
This:
Portable Resources
Becomes:
This:
Portable
23 package types
Users in NetInfo, useradd, pw
Support for Debian, Ubuntu, Red Hat, Solaris, OS X, Gentoo, SuSE, FreeBSD, and more
Debian
Debian
Red Hat
Debian
Red Hat
Package
Package
Configuration
Configuration should get modified after
package installation
Package
Service
Service should restart when
configuration changesConfiguration
Configuration should get modified after
package installation
Idempotence...
Idempotence...
Idempotence...
Describes the property of operations in mathematics and computer science which yield the same result after
the operation is applied multiple times.
Network Effects
puppetd in the cloud
Puppetmasterd
puppetdOS X puppetd
Linux
Code
Every Client:
Retrieve resource catalog from central server
Every Client:
Retrieve resource catalog from central server
Determine resource order
Every Client:
Retrieve resource catalog from central server
Determine resource order
Check each resource in turn, fixing if necessary
Every Client:
Retrieve resource catalog from central server
Determine resource order
Check each resource in turn, fixing if necessary
Rinse and repeat, every 30 minutes
Every Client:
Every Resource:
Every Resource:
Retrieve current state (e.g., by querying dpkg db or doing a stat)
Every Resource:
Retrieve current state (e.g., by querying dpkg db or doing a stat)
Compare to desired state
Every Resource:
Retrieve current state (e.g., by querying dpkg db or doing a stat)
Compare to desired state
Fix, if necessary (or just log)
Image from http://flickr.com/photos/pingnews/132543603/
Questions?
andrew@reductivelabs
twitter.com/littleidea
