Category Archives: PowerShell

Certificate management with Azure Automation and Let’s Encrypt

The Let’s Encrypt project has had a lasting impact on the Internet landscape. Free SSL certificates for everyone can be created automatically and signed by Let’s Encrypt. Due to the broad acceptance by browser manufacturers and cross-signing, the certificates are valid almost everywhere.
However, an automated solution is absolutely necessary due to the short validity period of 90 days. Using PowerShell in Azure Automation, a workflow can be created that takes care of certificate renewal and secure central storage. This workflow is the optimal basis for distributing the certificates to the actual service.

The basis for such an automation solution is provided by AzAutomation-PoshACME

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Is this ip address part of the Office 365 IP address range?

The analysis of firewall logs in Office 365 projects repeatedly raises the question: Is this blocked IP address part of the Office 365 address range?

Thanks to PowerShell and the information published by Microsoft, the answer is only a few lines of code away.

My script “Test-IsO365IpAddress.ps1” simply needs the IP address in question and optionally the TCP/UDP port. It retrieves the current list of address ranges from Microsoft and checks if the IP address is part of one of the IP networks. If this is the case, the script outputs all services that use this network.

If a port was also specified as part of the command the output will be filtered.

In addition to the service name (e.g. “Exchange Online”), the category (Optimize, Allow or Default), the required ports, the subnet and the somewhat obsolete “Required” category are also displayed.

Equipped with this data, the visit to the firewall team should be successful.

Many thanks also to Luben Kirov who allowed my to use his network functions to analysis the IP networks fast and reliable and Siva Padisetty whose function checkSubnet I used as inspiration for my own implementation.

Query the Log Analytics Workspace for all Azure VM

Sometimes you just need to know to which Log Analytics Workspace (OMS for the old folks out there) a VM send it’s data to. Or even all of you Azure VMs an once.

With the following script this task is easy as pie. And thanks to RamblingCookieMonster and his PSExcel modul you can send the result straight to everybody who is fond of Excel.

AzureRM.Network 0.9 breaks Azure Automation Runbooks

If you are using Azure Automation and use the AzureRM.Network module in one of the versions from 0.9.0 to min. 0.10.0, you may experience problems running Azure Automation Runbooks.

If the runbooks used are more complex overall, this version may result in a high memory load. If more than 400 MB RAM are used, the runbook ends after three attempts in the status “Suspended”.

The runbook job was attempted 3 times, but it failed each time. Common reasons that runbook jobs fail can be found here:

A downgrade to version 6.8.0 is required. The easiest way, of course, is with PowerShell.

$ModuleName = "AzureRM.Network"
$MaxVersion = "6.8.0"

# Gather information
$AffectedAutomationAccounts = Get-AzureRmAutomationAccount | Get-AzureRmAutomationModule -Name AzureRM.Network | Where-Object {$_.Version -gt $MaxVersion }

# Review
$AffectedAutomationAccounts | Select-Object ResourceGroupName, AutomationAccountName, Name, Version

#region Redeploy
Write-Verbose "Generate RootTemplate.json in `"`""
$uri = "$ModuleName/$MaxVersion/DeployItemToAzureAutomation?itemType=PSModule&requireLicenseAcceptance=False"
# This only generates the RootTemplate.json for the specified version. It simulates the Button "Deploy to Azure Automation" on the Gallery
Invoke-WebRequest $uri | Out-Null

# Download JSON 
$uri = "$ModuleName/$MaxVersion/RootTemplate.json"
$templateFileName = ".\RootTemplate.$ModuleName.$ModuleVersion.json"
Invoke-WebRequest -Uri $uri -OutFile $templateFileName | Out-Null

$AffectedAutomationAccounts | ForEach-Object {
    $AutomationAccountLocation = Get-AzureRmAutomationAccount -ResourceGroupName $_.ResourceGroupName -Name $_.AutomationAccountName | Select-Object -ExpandProperty Location
    $parameters = @{
        "Automation Account Name"            = $_.AutomationAccountName
        "Automation Account Location"        = "$AutomationAccountLocation"
        "New or existing Automation account" = "Existing"
    $params = @{
        "ResourceGroupName"       = $_.ResourceGroupName
        "TemplateFile"            = $templateFileName 
        "TemplateParameterObject" = $parameters
        "Mode"                    = 'Incremental'
    New-AzureRmResourceGroupDeployment @params