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Publishing Modules

PowerShell modules are reusable packages that encapsulate cmdlets, functions, and scripts. Publishing them to the PowerShell Gallery makes them accessible to other administrators, while consuming modules allows you to leverage shared functionality in your automation workflows. This section covers the process of publishing and consuming custom PowerShell modules.

Before publishing, you must create a free account on PowerShell Gallery. Use the Register-PSRepository cmdlet to associate your account with your local PowerShell environment:

Register-PSRepository -Name "PSGallery" -Publisher "your_publisher" -DefaultRepository
This cmdlet prompts for your gallery credentials and stores them securely.

Preparing Your Module

A module must include a module.psd1 file (the module manifest) and any supporting scripts. Ensure the manifest includes metadata like ModuleVersion, Description, and Author. For example:

@{
    ModuleVersion = '1.0.0'
    Description = 'Custom module for system diagnostics'
    Author = 'Your Name'
    PowerShellVersion = '7.2'
    FunctionsToExport = @('Get-SystemHealth')
}
Organize your module files in a directory structure like:
MyModule/
├── MyModule.psd1
└── Scripts/
    └── Get-SystemHealth.ps1

Publishing the Module

Use Publish-Module to upload your module to the gallery:

Publish-Module -Path "C:\MyModule\" -Repository "PSGallery"
- The module is validated for syntax, metadata, and dependencies before publication.
- Ensure credentials are stored via Register-PSRepository instead of using -NuGetApiKey.

Note: The PowerShell Gallery enforces strict validation rules. Ensure your module adheres to gallery guidelines to avoid rejection.

Consuming Modules

Installing Modules

Use Install-Module to download and install a module from the gallery:

Install-Module -Name "MyModule" -Scope CurrentUser
- The -Scope parameter determines installation location: CurrentUser (default) or AllUsers.
- For organizational use, install with -Scope AllUsers and ensure the module path is in your PSModulePath environment variable.

Importing Modules into a Session

After installation, import the module into your current session:

Import-Module -Name "MyModule"
This makes its cmdlets available for use. Verify with:
Get-Command -Module "MyModule"

Using Modules in Scripts

Modules can be imported in scripts using Import-Module at the top of the script. For example:

# MyScript.ps1
Import-Module "MyModule"
Get-SystemHealth | Export-Csv "C:\Reports\health.csv"
Ensure the script has the correct execution policy (e.g., Set-ExecutionPolicy RemoteSigned).

Key takeaways

  • Publishing: Use Register-PSRepository and Publish-Module to share modules. Validate metadata and dependencies before submission.
  • Consuming: Install modules with Install-Module and import them into sessions or scripts with Import-Module.
  • Best practices: Always test modules in isolated environments before publishing, and use versioning to manage updates.
  • Security: Use -Scope CurrentUser for personal modules and ensure scripts have the correct execution policy for remote-signed modules.