How to make your free Azure Linux VM actually free

Azure gives you a good amount of stuff free for 12 months when you sign up.

Quite tantalizing among these is a free Linux VM:

But if you make a B1S VM with the Ubuntu Server 18.04 LTS image, you start getting charged a trickle of cash for the disk. I amassed a bill of $1.26 before I noticed – quite shocking!

What’s up?

It turns out the 6 in P6 represents the size of the disk: 64 GB.

And the Ubuntu disk is only 30 GB. So you’re being charged for using too small a disk!

Luckily the fix is simple.

Start by creating your VM as normal:

Once it’s been provisioned, Stop (Deallocate) the VM:

Then open your VM in the Azure portal and navigate to Disks -> click disk name -> Configuration.

Set Size (GiB) to 64 and click Save.

Then start your VM back up. It should now be free of charge – and you’ll have a bit more space to play with.

Explore Azure Function’s PowerShell environment

Want to know more about the environment that your Azure Functions script is running in?

Here’s a little script I put together for this month’s Minneapolis PowerShell User Group:

# d_ExploreAzureEnvironment

# Script to explore the Azure Functions PowerShell environment
# by running commands from a menu and returning their output
# as a string.

using namespace System.Net

param($Request, $TriggerMetadata)

$itemToRun = $Request.Query.Run

$runResult = switch ($itemToRun) {
    0 { Get-ChildItem env: }
    1 { $PSVersionTable }
    2 { Get-Variable }
    3 { Get-Process }
}
if ($runResult) {
    $status = [HttpStatusCode]::OK
    $body   = $runResult | Out-String
}
else {
    $status = [HttpStatusCode]::BadRequest
    $body   = 'Supply a parameter of Run with a value between 0 and 3'
}

Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
    StatusCode = $status
    Body       = $body
})

(code is also on GitHub)

As you can see, the script contains a menu of commands that you can select by supplying a parameter of Run with a value between 0 and 3.

The selected command is executed, its output is stored in $runResult, and $runResult is converted to a string, then returned in the HTTP response body.

You can control the whole thing in your web browser like so:

I’ve included a few commands to examine system and PowerShell variables and processes. Adding a command is as simple as this:

You can also use this script to compare the local debug environment provided by Azure Functions Core Tools with Microsoft’s hosted version (a bit more on this soon…)

It would be trivial to extend this concept and make a script that executes arbitrary commands. But it feels like a bad idea, so I restrained myself.

What other commands would you like to try out? How’s your exploration of Azure Functions going? The race to be first commenter continues!

PowerShell Azure Functions to PowerApps “Hello World” (Part 2)

Last time, we deployed a function to Azure.

We now have a PowerShell script sitting in the cloud which we can talk to via a HTTP REST call.

This time, we’ll create a Custom Connector in PowerApps so that we can hook our script into an app.

Part 2: Create a Custom Connector

You should first make sure that you can talk to your function with PowerShell:

  1. Open your Function in the Azure console and click Get function URL.
  2. Leave default (Function key) selected and copy the URL. You should get something like this:
    https://dan-function.azurewebsites.net/api/a_HelloWorld?code=PA1Twlk/anVrchlbKSZSvZcWQCawE5MjY2JcQ3s0/kMYqpnvI2WEMA==
  3. Append &Name=myName to the end and run with Invoke-RestMethod:
Invoke-RestMethod "https://dan-function.azurewebsites.net/api/a_HelloWorld?code=PA1Twlk/anVrchlbKSZSvZcWQCawE5MjY2JcQ3s0/kMYqpnvI2WEMA==&Name=Dan"

Once you’re happy that your function is working, switch over to Power Apps.

Here’s a video demo:

And here are step-by-step instructions:

Start with Custom Connectors → New custom connector → Create from blank

(Create from Azure Service (Preview) doesn’t work with the Azure Functions 2.x runtime – a to-be-expected example of two preview features not working together.)

  1. General screen
    Host is your Azure Functions domain, in my case:
    dan-function.azurewebsites.net
  2. Security
    Authentication type: API key
    Parameter code: code
    Parameter label: code
    Parameter location: Query
  3. Definition
    Action New action
    1. General
      Summary and Operation ID: hello_world
    2. Request
      click Import from sample
      Verb = POST
      URL = an example of a full query, including Name=myName
      Click Import, then delete the block named code, as it is already handled in the Security section.
    3. Response
      Click Add default response, then run a chunk of PowerShell like this to get an example response that you can paste into the Body field:
$response = Invoke-WebRequest "https://dan-function.azurewebsites.net/api/a_HelloWorld?code=PA1Twlk/anVrchlbKSZSvZcWQCawE5MjY2JcQ3s0/kMYqpnvI2WEMA==&Name=Dan"
# Show response in console
$response
# Copy response body to clipboard
$response.Content | clip

Now save your connector and go to the Test tab.

Under Connections, click New connection. Enter your function key when prompted (the long bunch of characters that appear after code= in a request URL).

When your connection has been created, return to the Test screen, and try out your function. You should hopefully see a familiar and reassuring block of JSON – greetings!

That’s it for now. Next time, we complete the package by adding our PowerShell function to a real life actual PowerApp.

Resize browser window with PowerShell

I like to make little videos to go with my blog posts, and today I’ve been looking for a way to resize my browser window to a consistent size for recording.

Google immediately turned up this little beauty in the TechNet Script Center:

But when I tried it out:

Set-Window -ProcessName msedge -Width 1024 -Height 768

…I got a scary error:

Cannot convert argument "hWnd", with value: "System.Object[]", for "GetWindowRect" to type "System.IntPtr": "Cannot convert the "System.Object[]" value of type "System.Object[]" to type "System.IntPtr"."
At C:\Git\PowerShell\Set-Window.ps1:91 char:9
+         $Return = [Window]::GetWindowRect($Handle,[ref]$Rectangle)
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [], MethodException
+ FullyQualifiedErrorId : MethodArgumentConversionInvalidCastArgument

Here are the relevant lines from the function:

$Handle = (Get-Process -Name $ProcessName).MainWindowHandle
$Return = [Window]::GetWindowRect($Handle,[ref]$Rectangle)

A bit of exploring shows that one of the msedge processes is very different from the others:

$msedge = Get-Process msedge

$msedge

 NPM(K)    PM(M)      WS(M)     CPU(s)      Id  SI ProcessName
 ------    -----      -----     ------      --  -- -----------
     10     1.77       2.64       0.03     904   1 msedge
     19    17.69      30.85       0.34    4044   1 msedge
     57   128.71     150.07      57.81    5000   1 msedge
     83   185.82     182.69      38.77    8840   1 msedge
     29    47.08      75.16       9.78    9548   1 msedge
     83    82.12     128.55     171.92   11304   1 msedge
     22    27.96      41.45       0.41   11596   1 msedge
     20    21.31      38.14       2.47   12664   1 msedge
     49   303.89     156.82     116.14   12828   1 msedge
     24    29.71      48.62       1.52   14788   1 msedge
     26    21.57      31.14      25.20   15904   1 msedge
     56   132.80     157.91      76.39   15976   1 msedge
     20    19.50      33.82       0.27   16360   1 msedge
     16    11.88      19.46       0.05   16416   1 msedge
     34    59.82      89.91       3.55   17300   1 msedge
     29    48.37      76.49       3.34   17884   1 msedge
     22    25.07      42.07       0.41   18408   1 msedge
     27    51.70      78.73       5.69   18492   1 msedge
     26    39.59      60.88       0.81   18520   1 msedge
     28    54.87      73.89      18.56   19080   1 msedge
     47   108.27     135.33      26.95   19888   1 msedge

$msedge.MainWindowHandle

0
0
0
0
0
4326398
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

This was my first solution, which works fine:

# Only get non-zero handles
$Handle = (Get-Process -Name $ProcessName).MainWindowHandle | Where-Object {$_.ToInt32() -gt 0}
# The Handles have type IntPtr. Without .ToInt32() you get this error:
# Cannot compare "0" because it is not IComparable

But after a bit of poking around, I think this is a little better:

# Only get process whose parent is explorer
$Handle = (Get-Process -Name $ProcessName | Where-Object {$_.Parent.ProcessName -eq 'explorer'}).MainWindowHandle