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![Metadata in Chef!
Metadata is compiled on the client
at execution time!
Metadata is always stored in its
entirety in the node[] dictionary!
$node[var] = val
RACKSPACE® HOSTING
|
WWW.RACKSPACE.CO.UK](https://image.slidesharecdn.com/metadatamanagementinchefandpuppet-140202040609-phpapp02/75/A-Metadata-Ocean-in-Chef-and-Puppet-6-2048.jpg)
Uploaded byMarc Cluet
A Metadata Ocean in Chef and Puppet
The document discusses the role of metadata in configuration management tools like Puppet and Chef as presented by Marc Cluet at FOSDEM 2014. It defines metadata, explores its usage and practices within both tools, and highlights the importance of maintaining consistency and hierarchy in metadata management. Additionally, it addresses challenges related to metadata across different providers and suggests potential solutions.
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A Metadata Ocean in Chef and Puppet
- 1. A metadata oceanin Puppet and Chef FOSDEM’14 Marc Cluet DevOps & Automation Advisory Rackspace http://www.flickr.com/photos/elias_daniel/7470265444/
- 2. Who am I?! MarcCluet (@lynxman) More than 16 years of experience as a SysAdmin Founding member of Juju and MAAS while at Canonical Leading a DevOps Engineering Team at Rackspace Likes DevOps, programming and long walks on the beach RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 3. What is Rackspace?! Foundedin 1998 in San Antonio, TX by three guys that wanted to create a hosting company Home of Fanatical Support /o/ Second biggest Public Cloud in the world OpenStack Project co-founder RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 4. What is Metadata?! RACKSPACE®HOSTING | WWW.RACKSPACE.CO.UK /http://www.flickr.com/photos/boojee/3743753784/
- 5. What is Metadata?! Metadatais “data about data”! Structural Metadata! Descriptive Metadata! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK http://www.flickr.com/photos/ggvaidya/8256283184/
- 6. Metadata in Chef! Metadatais compiled on the client at execution time! Metadata is always stored in its entirety in the node[] dictionary! $node[var] = val RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 7. Metadata in Chef! Youcan add metadata in your! Attribute File! Node/Recipe! Environment! Role! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 8. Organisation in Chef! http://docs.opscode.com/essentials_environments.html RACKSPACE®HOSTING | WWW.RACKSPACE.CO.UK
- 9. Metadata in Puppet! Metadatais always compiled on execution time Metadata vars can’t be reassigned! $::var = val RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 10. Metadata in Puppet! Youcan add metadata in your! !Class vars! !Nodes! !Top Scope! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 11. Scoping in Puppet! http://docs.puppetlabs.com/puppet/latest/reference/lang_scope.html RACKSPACE®HOSTING | WWW.RACKSPACE.CO.UK
- 12. Hiera in Puppet! Solvesmetadata fragmentation issues! Defines hierarchy for easy organisation! All in clean and properly styled in either YAML or JSON! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 13. Hiera in Puppet! :backends: -yaml - json :yaml: :datadir: /etc/puppet/hieradata :json: :datadir: /etc/puppet/hieradata :hierarchy: - "%{::clientcert}" - "%{::custom_location}" - common RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 14. RACKSPACE® HOSTING |WWW.RACKSPACE.CO.UK http://www.flickr.com/photos/musebrarian/3289649684/
- 15. Bad metadata practices! InChef! Not keeping consistency between cookbook scope and environment scope! Not removing metadata from nodes when deprecated! Directly assigning metadata in a cookbook without a default attribute! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 16. Bad metadata practices! InPuppet! Directly assigning metadata in a class without a default value! Assigning vars in nodes.pp! Not assigning global vars in site.pp! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 17. RACKSPACE® HOSTING |WWW.RACKSPACE.CO.UK http://www.flickr.com/photos/deepstereo/9616389940/
- 18. Good behaviours! Separate varsfrom execution! Do not store vars on the execution area (classes/cookbooks)! High abstraction, good hierarchy! Metadata is all about context! ! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 19.
- 20. RACKSPACE® HOSTING |WWW.RACKSPACE.CO.UK http://www.flickr.com/photos/monica_andre/3119991125/
- 21. Metadata Across Providers! Provisioner ConfigMgmt cloud-init Puppet $dog = cute $::dog = big WHO IS RIGHT?!?! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 22. Metadata Across Providers! RACKSPACE®HOSTING | WWW.RACKSPACE.CO.UK http://www.flickr.com/photos/pss/233841567/
- 23. Hard Problem toSolve! Metadata brain split problem! Gets worse by adding more players! System view varies! Not same info from bios than from a user level program as facter or ohai! ! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 24. Possible Solutions! Central DBusing something fast! !Redis, mongoDB, mySQL! Metadata translators might fix it?! !Write for everything! Creates new SPoF! !Hard to solve without throwing $$! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 25. Hard Problem toSolve! http://xkcd.com/927/ RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 26. Possible Solutions! Scope varsfrom top of chain! Pass them over as ext facts! $dog in cloud-init becomes $::dog in puppet! RACKSPACE® HOSTING | WWW.RACKSPACE.CO.UK
- 27. @lynxman! http://slideshare.net/lynxmanuk/! http://www.rackspace.co.uk/technicalservices/ ! ! RACKSPACE® HOSTING | UKSALES: +44 (0)20 8712 6507 RACKSPACE® HOSTING | © RACKSPACE US, INC. | 5 MILLINGTON ROAD | HAYES, UNITED KINGDOM UB3 4AZ | UK SUPPORT: 0800 988 0300 | WWW.RACKSPACE.CO.UK RACKSPACE® AND FANATICAL SUPPORT® ARE SERVICE MARKS OF RACKSPACE US, INC. REGISTERED IN THE UNITED STATES AND OTHER COUNTRIES. | WWW.RACKSPACE.CO.UK 27