Azure Powershell - Check to see if resource exists

问题

I'm using Powershell to automate setting up my Azure environment - to create storage account, database, website, etc.

In development, I want to provision and a tear down a lot. Very often, I want to run my provisioning script and create a azure asset if it doesn't already exist

However, I haven't found an elegant way of doing this. Some of the "Get" cmdlets throw exceptions if the item doesn't exist, and catching it is a bit of a hack:

try {
    $storageAcct = Get-AzureStorageAccount -StorageAccountName $Name
    Write-Verbose "Storage Account already exists"
} catch {
    $storageAcct = New-AzureStorageAccount -StorageAccountName $Name -Location $Location
}

What's more, with some commands, I can't catch the exception at all and I don't know why:

try {
        $cache = Get-AzureRedisCache -ResourceGroupName $resourceGroupName -Name $cacheName
} catch {
       //Even with an exception, never arrives here.
}

Is there a better way to do this?

回答1:

You should use Test-AzureName for this instead of Get-AzureStorageAccount.

if (!Test-AzureName -Storage $Name)
{
   # create the storage account.
}

This will work for Cloud Services, Web Apps, and Service Bus namespaces too. For your database, you will have to resort back to your existing approach.

Added the following to address questions about v2 (ARM) resources:

For v2 resources (ARM), the story is mostly the same. For example, the DNS name for a v1 or v2 storage account will be the same, such as contoso.blob.core.windows.net. The same holds for Azure Web Apps (formerly Azure Web Sites), where you would have a DNS name such as contoso.azurewebsites.net. So, in other words, Test-AzureName would work just as well for these resources in ARM.

One notable difference is the DNS name for virtual machines. In v1, virtual machines are contained in a cloud service and get a DNS name such as contoso.cloudapp.net. For v2 virtual machines, the public DNS name is provided by the Public IP Address resource, for which the DNS name for a virtual machine in East US (for example) would be contoso.eastus.cloudapp.azure.com. To test for the availability of this DNS name, you should use the Test-AzureRmDnsAvailability cmdlet. For example,

if (Test-AzureRmDnsAvailability -DomainNameLabel "contos0" -Location "East US")
{
  # Assign DNS name to Public IP Address resource here.
}

回答2:

Try this:

if(!(Get-AzureRmStorageAccountNameAvailability -Name $storageName))
{
    New-AzureRmStorageAccount -ResourceGroupName $resourceGroupName -Name $storageName -SkuName Standard_LRS
}

回答3:

I usually go for the following (works for pretty much any resource in Azure, just replace the "Get" module and parameters):

function Test-AzureStorageAccountExists {
     Param(
        [string]$resourceGroupName,
        [string]$storageAccountName
     )

     $SA = Get-AzureRmStorageAccount -Name $storageAccountName -ResourceGroupName $resourceGroupName -ErrorVariable notPresent -ErrorAction SilentlyContinue
     if ($notPresent) {return $false}
}

回答4:

something like this ?

if(
 Get-AzureStorageAccount | Where {$_.Label -match $name} | measure |select -expand count -eq 0) {

    $storageAcct = New-AzureStorageAccount -StorageAccountName $Name -Location $Location
}

回答5:

Maybe you can use the cmdlet Get-AzureRmResource. If the resource exists, it returns the information about the specified resource including the resource type; If not, it return $null. e.g.:

$MyRes=Get-AzureRmResource -ResourceName "MyResourceName" -ResourceGroupName 
"MyResourceGroupName"
if ($null == $MyRes) {
  # Not existing
}

回答6:

I needed to check for the existing of a variable in the Azure Automation account using Get-AzureRmAutomaitonVariable before deciding if it needed to be created. user888734's solution of using a "catch" helped me get past this issue which I was blocked on for 2 days :-)

try {
    $existingVariable = Get-AzureRMAutomationVariable -ResourceGroupName $resourceGroup -AutomationAccountName $automationAccountName -Name $variable
} catch {
    New-AzureRmAutomationVariable -ResourceGroupName $resourceGroup -AutomationAccountName $automationAccountName -Name $variable -Value $value -Encrypted $False
}

回答7:

It is my solution with new Azure PowerShell Az module


$StorageAccountName = "Storage account name"
$ResourceGroupName = "Resource group name"

$StorageAccount = Get-AzStorageAccount -Name $StorageAccountName -ResourceGroupName $ResourceGroupName -ErrorAction SilentlyContinue

if($StorageAccount -eq $null){
    $storage =  New-AzStorageAccount -ResourceGroupName $ResourceGroupName -StorageAccountName $StorageAccountName -Location "westeurope" -SkuName Standard_LRS -Kind StorageV2
}
else{
    Write-Host "$StorageAccountName already exist"
}

来源：https://stackoverflow.com/questions/30076601/azure-powershell-check-to-see-if-resource-exists

标签

powershell

azure

azure-powershell