Azure Powershell-检查资源是否存在 [英] Azure Powershell - Check to see if resource exists

问题描述

我正在使用Powershell来自动设置Azure环境-创建存储帐户，数据库，网站等.

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

在开发中，我要提供很多东西并拆除.很多时候，我想运行配置脚本并创建天蓝色资产(如果尚不存在)

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

但是，我还没有找到一种优雅的方式来做到这一点.如果该项目不存在，则某些"Get" cmdlet会引发异常，并且捕获该项目有点hack:

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
}

此外，使用某些命令，我​​根本无法捕获异常，也不知道为什么:

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.
}

有更好的方法吗?

推荐答案

为此，您应使用 Test-AzureName 而不是Get-AzureStorageAccount.

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

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

这也将适用于Cloud Services，Web Apps和Service Bus命名空间.对于您的数据库，您将不得不采用现有方法.

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.

**

**

对于v2资源(ARM)，情况大致相同.例如，v1或v2存储帐户的DNS名称将相同，例如contoso.blob.core.windows.net.对于Azure Web应用程序(以前称为Azure网站)也是如此，在其中您将拥有一个DNS名称，例如contoso.azurewebsites.net.因此，换句话说，Test-AzureName对于ARM中的这些资源同样适用.

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.

一个显着的区别是虚拟机的DNS名称.在v1中，虚拟机包含在云服务中，并获得DNS名称，例如contoso.cloudapp.net.对于v2虚拟机，公共DNS名称由公共IP地址资源提供，例如，美国东部的虚拟机的DNS名称为contoso.eastus.cloudapp.azure.com.要测试此DNS名称的可用性，您应该使用 Test-AzureRmDnsAvailability cmdlet.例如，

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.
}

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