How to retrieve App Service Plan instance name (RDXXXXX)? - azure

I am having an issue trying to retrieve all the instance names in an Azure App Service Plan.
In Azure Monitor, if you specify a "Scope" to "App Service Plan" and look at the Metric "CPU Percentage" and then add a filter to specify the "Instance" property, you can see which instance uses the most CPU. I am trying to do a PowerShell script to get these values. Unfortunatly I have not found any Azure REST Api that would give me this information so that my script would be 100% dynamic. I looked at the AzureRm or Az PowerShell modules but did not find anything there.
Any ideas how I can retrieve this list? The instances names looks like this :RD123456.
Thanks for you help !

Suppose you want to get the web instance name, if that's right you could get it from instance process with Web Apps - Get Instance Process.
And under the environment_variables there is a COMPUTERNAME suppose this is what you want.

Related

Subscription-id, resourceGroupName and name of the App from inside the web-app PowerShell

I have an application hosted in Azure PAAS. The connection string for the application is stored under 'Configuration' -> 'Connection strings'
My application has a PowerShell instance. I want to iterate through all the Connection strings present under 'Configuration' -> 'Connection strings'
I have seen the Azure document. As my application itself is the app, can there be a way to skip the details like 'subscriptionId', 'resourceGroupName' and 'name'?
This will help to make the code more generic.
As my application itself is the app, can there be a way to skip the
details like 'subscriptionId', 'resourceGroupName' and 'name'?
AFAIK, Its not possible to acquire the connection strings using Rest API, or PowerShell of an Azure web application without providing Resource group name or subscription.
The MS DOCUMENT you have followed is to list the connection strings which is correct but we need to pass those credentials to achieve the same.
If my understanding is correct as its your own application and if its publicly hosted then anyone will not be able to get the resource group name, application name(If you are using custom domain) or subscription details.
Alternatively, we can use the Az cli by providing the resource group only :-
For more information please refer the below links:-
SO THREAD|Get the list of azure web app settings to be swapped using PowerShell
If you are going to use the REST API calls for your code, then the simple answer is just: No.
I think in all cases the answer is going to be no honestly..
You can't drop those unique IDs, because those are required parameters to retrieve the correct data.
If you want to make the code more generic, then you should write the code to retrieve the values for those parameters. Instead of hardcoding the values.
Your powershell code will always need to authenticate, or use a Managed Identity, and the identity used to authenticate will always have the subscriptionid as value in its object. As for the rest, well i think you get the gist of what im suggesting.

Lookup Azure application name from within a running function app

Is it possible to lookup the application name for an Azure app as it runs, i.e., get the information about that is displayed in the Azure portal? In the example below, I'd want something to tell me from within the application that I am running sitemap-prod-eastus.
I've been looking at the Azure Context object but not seeing what I need. There is an invocation ID, a name for the function, a directory - not the info in this window.
Maybe this can be done through Azure Application Insights?
I am working in Node JS.
I've not seen anything that would expose this to a function app. That said, there is one sort of workaround that you could do which would work - go to the Configuration blade for the function app, Application settings tab, and add a configuration key like function_name and set its value to the name of your app. Your app could then just read it out of configuration.
It's an extra step, but if you're doing it with something like ARM or Terraform, it's just another configuration entry with a variable you already declared to set up the app in the first place.
Answering my own question: Azure provides WEBSITE_SITE_NAME in the runtime environment that matches the name of the function app.

What is the correct, programmatic way to identify if an Azure region supports a resource type fully in Powershell?

Currently, I'm looking at using Front Door in an Azure resource group. When I look at https://azure.microsoft.com/en-gb/global-infrastructure/services/?products=frontdoor&regions=all , it shows that this resource is in GA.
However, if I attempt to deploy a working, tested ARM template to certain regions I get an error which explictly indicates that the region is unsupported (this error message is from an Azure Devops pipeline, but I have seen the same error using powershell deployment ofthe same template with a params file locally):
As such, it doesn't seem like I can trust the availability by region site (and to be fair, it does have a disclaimer on it).
How do I tell, before a deployment is fired, whether I can safely use (i.e. deploy a specified resource type to) the region?
Ideally I'm looking for a dynamic solution to this, as just because a region isn't supported now doesn't mean it won't be in the future.
For your use-((Register-AzResourceProvider -ProviderNamespace Microsoft.Network).ResourceTypes | where-object ResourceTypeName -eq frontdoors).Locations
which will provide list of locations
You can refer following link for more examples-
https://learn.microsoft.com/en-us/azure/azure-resource-manager/resource-manager-supported-services#azure-powershell

Get VM name for an instance of Azure web app from REST API or PowerShell

I am trying to find a REST API / PowerShell cmdlet to retrieve the VM name(starts with RD) for an instance of Azure web app.
I found out that I can list the process Ids by Instance Id and then get Instance Process with Azure App Service. This object has details including the Machine Name. I'm wondering if there is a better way of doing this, something with lesser API calls perhaps.
Background:
I need to restart a specific instance of a Azure Web app programmatically. Users calling restart can only see the VM name or Role Instance of a web App in Application insights.
I found APIs to list instances but nothing to find mapping between instance Id and VM name directly.
Do you try this API Virtual Machines - List?
By Using this api, you can get id and name from values[]
GET https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachines?api-version=2018-06-01
Result example :
{
"value": [
{
// ignore
"id": "/subscriptions/{subscriptionsID}/resourceGroups/test-resource-group/providers/Microsoft.Compute/virtualMachines/my-vmname",
"name": "my-vmname"
}
]
}
You can try to use the REST API Web Apps - List Instance Identifiers to get all scale-out instances of an app.
GET https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/instances?api-version=2016-08-01
Actually, the instances for a WebApp by scaling out is for its App Service Plan. For example, I scaled up the instance number of my webapp to 4 on Azure portal, then the instance number of its App Service Plan as the figures below.
And I got the json response from the REST API, as below.

How can I programatically (C#) read the autoscale settings for a WebApp?

I'm trying to build a small program to change the autoscale settings for our Azure WebApps, using the Microsoft.WindowsAzure.Management.Monitoring and Microsoft.WindowsAzure.Management.WebSites NuGet packages.
I have been roughly following the guide here.
However, we are interested in scaling WebApps / App Services rather than Cloud Services, so I am trying to use the same code to read the autoscale settings but providing a resource ID for our WebApp. I have already got the credentials required for making a connection (using a browser window popup for Active Directory authentication, but I understand we can use X.509 management certificates for non-interactive programs).
This is the request I'm trying to make. Credentials already established, and an exception is thrown earlier if they're not valid.
AutoscaleClient autoscaleClient = new AutoscaleClient(credentials);
var resourceId = AutoscaleResourceIdBuilder.BuildWebSiteResourceId(webspaceName: WebSpaceNames.NorthEuropeWebSpace, serverFarmName: "Default2");
AutoscaleSettingGetResponse get = autoscaleClient.Settings.Get(resourceId); // exception here
The WebApp (let's call it "MyWebApp") is part of an App Service Plan called "Default2" (Standard: 1 small), in a Resource Group called "WebDevResources", in the North Europe region. I expect that my problem is that I am using the wrong names to build the resourceId in the code - the naming conventions in the library don't map well onto what I can see in the Azure Portal.
I'm assuming that BuildWebSiteResourceId is the correct method to call, see MSDN documentation here.
However the two parameters it takes are webspaceName and serverFarmName, neither of which match anything in the Azure portal (or Google). I found another example which seemed to be using the WebApp's geo region for webSpaceName, so I've used the predefined value for North Europe where our app is hosted.
While trying to find the correct value for serverFarmName in the Azure Portal, I found the Resource ID for the App Service Plan, which looks like this:
/subscriptions/{subscription-guid}/resourceGroups/WebDevResources/providers/Microsoft.Web/serverfarms/Default2
That resource ID isn't valid for the call I'm trying to make, but it does support the idea that a 'serverfarm' is the same as an App Service Plan.
When I run the code, regardless of whether the resourceId parameters seem to be correct or garbage, I get this error response:
<string xmlns="http://schemas.microsoft.com/2003/10/Serialization/">
{"Code":"SettingNotFound","Message":"Could not find the autoscale settings."}
</string>
So, how can I construct the correct resource ID for my WebApp or App Service Plan? Or alternatively, is there a different tree I should be barking up to programatially manage WebApp scaling?
Update:
The solution below got the info I wanted. I also found the Azure resource explorer at resources.azure.com extremely useful to browse existing resources and find the correct names. For example, the name for my autoscale settings is actually "Default2-WebDevResources", i.e. "{AppServicePlan}-{ResourceGroup}" which I wouldn't have expected.
There is a preview service https://resources.azure.com/ where you can inspect all your resources easily. If you search for autoscale in the UI you will easily find the settings for your resource. It will also show you how to call the relevant REST Api endpoint to read or update that resorce.
It's a great tool for revealing a lot of details for your deployed resources and it will actually give you an ARM template stub for the resource you are looking at.
And to answer your question, you could programmatically call the REST API from a client with updated settings for autoscale. The REST API is one way of doing this, the SDK another and PowerShell a third.
The guide which you're following is based on the Azure Service Management model, aka Classic mode, which is deprecated and only exists mainly for backward compatibility support.
You should use the latest
Microsoft.Azure.Insights nuget package for getting the autoscale settings.
Sample code using the nuget above is as below:
using Microsoft.Azure.Management.Insights;
using Microsoft.Rest;
//... Get necessary values for the required parameters
var client = new InsightsManagementClient(new TokenCredentials(token));
client.AutoscaleSettings.Get(resourceGroupName, autoScaleSettingName);
Besides, the autoscalesettings is a resource under the "Microsoft.Insights" provider and not under the "Microsoft.Web" provider, which explains why you are not able to find it with your serverfarm resourceId.
See the REST API Reference below for getting the autoscale settings.
GET
https://management.azure.com/subscriptions/{subscription-id}/resourceGroups/{resource-group-name}/providers/microsoft.insights/autoscaleSettings/{autoscale-setting-name}?api-version={api-version}

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