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someara
February 03, 2015
Technology
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Configuration Management Camp 2015
Ghent Belgium
someara
February 03, 2015
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Transcript
Chef Reusability! Config Management Camp! Ghent, Belgium! February 2015
Sean OMeara!
[email protected]
! @someara
whoami
Part 1
Things that are true
New Chef users expect community cookbooks to just work
Especially the Chef maintained cookbooks
This is not the current state of things
This leads to sadness
We must repair it
People copy patterns
The status quo cannot be allowed to continue
Common pain points https://www.flickr.com/photos/kwl/4595324641
Platform and version support
Weak scoping
No standard interface
Compilation phase work
Needing chef-rewind
Attributes and precedence
Pattern proliferation
The path out of the darkness https://www.flickr.com/photos/71267357@N06/15864687537
Change how cookbooks are written
systems beliefs! behaviors
Standardize interfaces
Eliminate the pain points
Focus on resources
Make it super easy! to write resources
Ship resources for ALL THE THINGS
Copy better patterns
Make it fucking delightful
None
Part 2
Simple design patterns https://www.flickr.com/photos/pollock/4172865252
None
None
You just separated data from code
You also just built an interface
Complex design patterns https://www.flickr.com/photos/alanosaur/6417040565
None
None
This is where things get weird
amazon debian-6 debian-7 ubuntu-10.04 ubuntu-12.04 ubuntu-14.04 centos-5 centos-6 centos-7 freebsd-9
freebsd-10
Debconf! Docker! LaunchD! Runit! SMF! Simple! SystemD! Sysvinit! Upstart! Windows
Services
There is a large amount of variation between software versions
There is an insane amount variation across platforms
These differences need to be handled somewhere
Early techniques did everything in the recipe
data resource pattern
Later techniques focused on isolation
Resource pattern isolation
None
private recipes by convention
Resource data isolation
None
None
We now have decision logic in our interface
Default values often need to be computed
Doing this in the interface leads to sorrow
None
We need a better way
Consumption Patterns https://www.flickr.com/photos/ektogamat/2578779839
None
None
None
None
Why resources are best https://www.flickr.com/photos/cross_stitch_ninja/4932950637
node attributes roles environments databags are nice to haves
They drive data about resources
Resources are fundamental
Resources are strongly scoped
Resources have a standardized interface
Resources have types, names, and parameters
Type
Name
Parameters
Resources have identities
None
Resource can see each other
Promise to talk
Promise to listen
Resource behave the same across platforms
None
None
None
Resource can have multiple providers
None
Writing simple resources
yum
</switches github>
Writing complex resources
mysql httpd
</switches github>
fin