Windows PowerShell Desired State Configuration (DSC) for Veteran Chefs - ChefConf 2015
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This document compares the configuration management tools Chef and DSC (Desired State Configuration) from Microsoft. Both Chef and DSC support configuration as code, domain-specific languages, idempotent operations, and convergence to manage node configurations. DSC uses PowerShell as its scripting language and has resources and properties to define configurations. Chef uses Ruby as its scripting language and has resources defined with attributes. The document provides examples of configuring an environment variable using both tools and recommends sessions to attend at a Chef conference focused on DSC, PowerShell, and automating configurations.
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Windows PowerShell Desired State Configuration (DSC) for Veteran Chefs - ChefConf 2015
- 2. S T E V E N M U R A W S K I - @ S t e v e n M u r a w s k i D A M I E N C A R O - @ d c a r o A p r i l 2 , 2 0 1 5
- 3. • D SC C onfigur ation Syntax
- 5. PS DSC Extension point DSC is the built-in configuration platform for Microsoft
- 9. Feature DSC Chef Configuration as Code Yes Yes Domain Specific Language (DSL) Yes Yes DSL embedded within Script Language Yes - PowerShell Yes – Ruby “Resource” Concept Yes Yes Configurable resource attributes Yes – “Property” Yes – “Attribute” Idempotence of operations Yes Yes Convergence Yes Yes Client agent / tool Yes – LCM / Start- DSCConfiguration Yes – chef-client / chef- client
- 10. Feature DSC Chef Configuration as Code Yes Yes Domain Specific Language (DSL) Yes Yes DSL embedded within Script Language Yes - PowerShell Yes – Ruby “Resource” Concept Yes Yes Configurable resource attributes Yes – “Property” Yes – “Attribute” Idempotence of operations Yes Yes Convergence Yes Yes Client agent / tool Yes – LCM / Start- DSCConfiguration Yes – chef-client / chef- client
- 11. # Chef env 'editor' do key_name "EDITOR" value "emacs" end # DSC environment editor { Name = "EDITOR" Value = "emacs" }
- 13. dsc_script 'myexample1' do code <<-EOH File TestFile { Ensure = "Present" DestinationPath= "c:demotest.txt" Contents= "Hello World" } EOH end
- 14. notification dsc_resource 'myexample2' do resource :windowsfeature property :ensure, "Present" property :name, "Web-Server" end
- 16. RefreshMode Configuration LCMSettings { Node localhost { Settings { RefreshMode = "Disabled" } } }
- 17. Encrypted databags Chef client In memory, on the node Secure string Powershell
- 18. http://bit.ly/c hefc onf_dsc https ://s uper market.chef.io / http://w w w.pow ershell.org • STEVEN MURAWSKI - @StevenMurawski • DAMIEN CARO - @dcaro
- 21. • Bookmark for more information on Microsoft and DevOps: http://aka.ms/devops • DevOps resources for Practitioners: http://aka.ms/devopsmva • Key sessions to attend @ Chef Date Title Speaker(s) Wed @ 1:30-2:10p Microsoft Presents: Chef in Action on Azure Eugene Chigirinskiy; Kundana Palagiri Thurs @ 1:15-1:55p PowerShell from the Ground Up Jeffery Snover Thurs @ 1:15-1:55p Automate what you can, document what you can’t and have the wisdom to know the difference Jessica DeVita Thurs @ 2:10-2:5o Windows PowerShell Desired State Config (DSC) for Veteran Chefs Damien Caro; Steven Murawski
Editor's Notes
- Reference: https://technet.microsoft.com/en-us/library/dn249912.aspx DSC is a new management platform in Windows PowerShell that enables deploying and managing configuration data for software services and managing the environment in which these services run. DSC provides a set of Windows PowerShell language extensions, new Windows PowerShell cmdlets, and resources that you can use to declaratively specify how you want your software environment to be configured. It also provides a means to maintain and manage existing configurations.
- Additional references: - http://blogs.msdn.com/b/powershell/archive/2015/02/27/invoking-dsc-resource-methods-directly-from-powershell-cim-apis.aspx - https://technet.microsoft.com/en-us/library/dn249922.aspx
- Powershell instrospect Get-DSCResource Convert to JSON
- Additional reading: https://docs.chef.io/resource_dsc_resource.html
- Additional references: - http://blogs.msdn.com/b/powershell/archive/2015/02/27/invoking-dsc-resource-methods-directly-from-powershell-cim-apis.aspx - https://technet.microsoft.com/en-us/library/dn249922.aspx