How to retrieve storage account key using powershell function app? - azure

Question

I'm using powershell function app to retrieve storage account key but i'm not able to access resources .Please help me .
$resourceGroup = "DemoResourceGroup"
$AccountName = "Demo"
$Key = (Get-AzStorageAccountKey -ResourceGroupName $resourceGroup -Name $AccountName)
Write-Host "storage account key 1 = " $Key
I'm getting following error :
2020-05-14T14:00:05Z [Error] ERROR: Get-AzStorageAccountKey : 'this.Client.SubscriptionId' cannot be null.
At D:\home\site\wwwroot\TimerTrigger1\run.ps1:25 char:8
+ $key = Get-AzStorageAccountKey -ResourceGroupName "DocumentParser_FBI ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError: (:) [Get-AzStorageAccountKey], ValidationException
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.Management.Storage.GetAzureStorageAccountKeyCommand
Script stack trace:
at , D:\home\site\wwwroot\TimerTrigger1\run.ps1: line 25
Microsoft.Rest.ValidationException: 'this.Client.SubscriptionId' cannot be null.
at Microsoft.Azure.Management.Storage.StorageAccountsOperations.ListKeysWithHttpMessagesAsync(String resourceGroupName, String accountName, Nullable1 expand, Dictionary2 customHeaders, CancellationToken cancellationToken)
at Microsoft.Azure.Management.Storage.StorageAccountsOperationsExtensions.ListKeysAsync(IStorageAccountsOperations operations, String resourceGroupName, String accountName, Nullable1 expand, CancellationToken cancellationToken)
at Microsoft.Azure.Management.Storage.StorageAccountsOperationsExtensions.ListKeys(IStorageAccountsOperations operations, String resourceGroupName, String accountName, Nullable1 expand)
at Microsoft.Azure.Commands.Management.Storage.GetAzureStorageAccountKeyCommand.ExecuteCmdlet()

Answer 1

According to the script you provide, you use Az module. So if you want to choose which Azure subscription you use, you need to use the command Select-AzSubscription. Besides, you also can add -Subscription "<subscription Id>" in Connect-AzAccoun to ensure when you login, you choose the right subscription.
For example
Create the service principal
Import-Module Az.Resources # Imports the PSADPasswordCredential object
$credentials = New-Object Microsoft.Azure.Commands.ActiveDirectory.PSADPasswordCredential -Property #{ StartDate=Get-Date; EndDate=Get-Date -Year 2024; Password=<Choose a strong password>}
$sp = New-AzAdServicePrincipal -DisplayName ServicePrincipalName -PasswordCredential $credentials
assign the role to the service principal. For example, assign Contributor role to the sp at the subscription level
New-AzRoleAssignment -ApplicationId <service principal application ID> -RoleDefinitionName "Contributor" `
-Scope "/subscriptions/<subscription id>"
Script
$appId = "your sp app id"
$password = "your sp password"
$secpasswd = ConvertTo-SecureString $password -AsPlainText -Force
$mycreds = New-Object System.Management.Automation.PSCredential ($appId, $secpasswd)
Connect-AzAccount -ServicePrincipal -Credential $mycreds -Tenant <you sp tenant id>
Get-AzSubscription -SubscriptionName "CSP Azure" | Select-AzSubscription
$resourceGroup = "nora4test"
$AccountName = "qsstorageacc"
$Key = (Get-AzStorageAccountKey -ResourceGroupName $resourceGroup -Name $AccountName)[0].Value
Write-Host "storage account key 1 = " $Key