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PowerShell Saturday Singapore 01: PowerShell 4.0

Brought to you by Singapore PowerShell User Group

http://www.facebook.com/singaporepowershell

http://powershell.org/wp/user-groups/singapore-powershell-user-group/

singapore@powershellgroup.org

Speaker: Ravikanth C

Twitter: @Ravikanth

FaceBook: Ravikanthc

Blog: http://ravichaganti.com/blog and http://www.powershellmagazine.com

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Thank you to the Sponsors

Prizes Sponsored by SAPIEN Technologies• Download a trial of SAPIEN PowerShell Studio 2012:• http://www.sapien.com/powershellstudio

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About Me

• 12+ years in IT; Lead Engineer for MS Collaboration Solutions at Dell• PowerShell MVP since 2010• Founder and Editor of PowerShell Magazine• Community Lead• Bangalore IT Pro User Group (@BangaloreITPro)• PowerShell Bangalore User Group (@PSBug)

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Windows Management Framework 4.0• Includes Updates to …• PowerShell• PowerShell ISE• PowerShell Web Services

• Not updated in the current build• Windows Remote Management (WinRM)• Windows Management Instrumentation (WMI)

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PowerShell 4.0 - Requirements

• Requirements• Windows Server 2008 R2 SP1 (x86 and amd64)• Windows 7 SP1• Windows Server 2012• .NET Framework 4.5• No Windows 8 yet!

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What is new?

• Several enhancements to existing features and cmdlets!• Desired State Configuration (DSC)

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Elevated Privileges

• #Requires can now be used for checking administrative credentials• #Requires -runasadministrator

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PowerShell Web Access

• Supports connecting and disconnecting from sessions• Default values for the connection settings can be updated via

Web.config

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Pipeline Variable

• Useful in iterative pipelines• Pipeline variable becomes available throughout the pipeline• Cmdlets support -PipelineVariable

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Method Syntax for Filtering

• Perform object filtering by using Where() method on the object collection• Part of Desired State Configuration Module• Not all operators are supported

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Dynamic Method Names

• Dynamic Properties support has always been there• Variables can be used to invoke methods dynamically

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Built-in cmdlet for file hashing

• Get-FileHash• MACTripleDES• MD5• RIPEMD160• SHA1• SHA256• SHA384• SHA512

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Other Changes

• Get-Process include UserName• Remote and workflow script debugging• -Runnow support for Register-ScheduledJob and Set-ScheduledJob• -RepeatIndefinitely support for New-JobTrigger and Set-JobTrigger• -Workgroup parameter support for Add-Computer and Remove-

Computer• http://technet.microsoft.com/en-us/library/hh857339.aspx

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Desired State Configuration

• Platform that enables deployment and management of configuration data• DSC provides• Language extensions• Cmdlets to manage DSC• Resources to specify the configuration• Means to maintain and manage configuration

• Uses PowerShell remoting• Uses declarative syntax

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Imperative vs Declarative Syntax

• Imperative – How a task needs to be performed• PowerShell is imperative by design

• Declarative – What task needs to be performed

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DSC – Terminology

• Configuration• Node• Resource

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DSC - Resources

• Built-in Resources• Archive• Environment• File• Group• Log• Package• Process• Registry• Role• Script• Service• User

• Possible to create custom resources

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DSC – Custom Resources

• Written as PowerShell Modules• Copy to C:\Windows\System32\WindowsPowerShell\v1.0\Modules\

PSDesiredStateConfiguration\PSProviders• Requires

• MOF Schema• Module Script

• Get-TargetResource• Set-TargetResource• Test-TargetResource

• Module Manifest

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DSC – Push vs Pull

• Push• Pros

• Simple• Control

• Cons• Lack of complete automation• Limited Scalability

• Pull• Pros

• Complete Automation• Scalability

• Cons• ?

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DSC – Pull Server

• Windows Feature

• Available on Windows Server 2012 and 2012 R2• An IIS endpoint

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DSC – Local Configuration Manager

• DSC Engine• Runs on all nodes• Responsible for calling the DSC resources• LCM properties can be updated to use pull model; of course, using

DSC

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Summary

• DSC is the biggest thing in PowerShell 4.0• Get started with DSC!

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References

• Windows Management Framework 4.0 Downloadhttp://www.microsoft.com/en-us/download/details.aspx?id=39347• What is new in PowerShell 4.0?

http://technet.microsoft.com/en-us/library/hh857339.aspx• Desired State Configuration

http://technet.microsoft.com/en-us/library/dn249912.aspx• Imeprative vs Declarative Syntax in PowerShell

http://www.powershellmagazine.com/2013/07/05/imperative-versus-declarative-syntax-in-powershell/

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Q & A