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Azure VM Monitoring – Part 3: Autoscaling with PowerShell
Posted in Virtual Machine Manager, Windows Powershell, Windows Server | No Comment | 14,906 views | 08/05/2014 00:04

This is the third part of my Microsoft Azure VM Monitoring series. In the first part, I showed you how to simply monitor Azure VM with PowerShell. In the second part, we output all data into XML and parse it on a website.

Now we are moving forward.. Adding an autoscale function into our monitoring script. So, in a Azure VM farm, we have a stopped VM or VMs. We will monitor average CPU usage of all VMs in farm. If their CPU usage reaches to 40% percent, that will start our stopped VM to autoscale our web farm.

This is just an idea. You can use other metrics to autoscale your environment. For example, you can use IIS metrics to monitor website performance and start VMs if farm is under high web load.

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################################
## VirtualMetric: Azure Module
################################
 
# Debug Path
$DebugPath = "C:\PowerShell\debug.txt"
 
# Debug Preference
$ErrorActionPreference = "SilentlyContinue";
 
# Import Azure PowerShell Module
Import-Module Azure -EA Stop
 
# Import Azure Settings
Import-AzurePublishSettingsFile "C:\PowerShell\Azure.Credentials.publishsettings" -EA Stop
 
# Azure VM Credentials
$Credentials = Get-Credential
 
while ($True)
{
	# Execution Time Calculation
	$PoSHStartTime = Get-Date
 
	# Start Work
	Write-Host "Starting job.."
 
	# Append Stats XML Header
	$GeneralStatsXML = "<?xml version=""1.0"" encoding=""utf-8""?>`n"
	$GeneralStatsXML += "<Result>`n"
	$GeneralStatsXML += " <Code>1</Code>`n"
	$GeneralStatsXML += " <Message>Operation is completed</Message>`n"
 
	# Append VM Reports XML Header
	$VMReportsXML = "<?xml version=""1.0"" encoding=""utf-8""?>`n"
	$VMReportsXML += "<Result>`n"
	$VMReportsXML += " <Code>1</Code>`n"
	$VMReportsXML += " <Message>Operation is completed</Message>`n"
 
	# Get Azure Virtual Machines
	$VMs = Get-AzureVM | Where ServiceName -eq "AzureWebFarm"
 
	# Clear Values
	$VMCount = 0;
	$ActiveVMCount = 0;
	$VMTotalvCPU = 0;
	$VMTotalCPUUsage = 0;
	$VMFreeCPU = 0;
	$VMTotalMemory = 0;
	$VMTotalMemoryUsage = 0;
	$VMFreeMemory = 0;
	$VMTotalDisk = 0;
	$VMTotalDiskUsage = 0;
	$VMFreeDisk = 0;
 
	foreach ($VM in $VMs)
	{
		# Clear Variables
		$VMDetails = $Null;
		$AzureEndpoints = $Null;
		$VMName = $Null;
		$VMServiceName = $Null;
		$VMIPAddress = $Null;
		$VMAvailabilitySetName = $Null;
		$VMInstanceSize = $Null;
		$VMPowerState = $Null;
		$VMDNSAddress = $Null;
		$VMDNSName = $Null;
		$VMWinRMCertThumbprint = $Null;
		$CheckAzureVMCert = $Null;
		$OSInformation = $Null;
		$CPUInformation = $Null;
 
		# Get Azure VM Details
		$VMDetails = Get-AzureVM -ServiceName $VM.ServiceName -Name $VM.Name
 
		# Get Azure VM Information
		$VMName = $VMDetails.Name
		$VMServiceName = $VMDetails.ServiceName
		$VMIPAddress = $VMDetails.IPAddress
		$VMAvailabilitySetName = $VMDetails.AvailabilitySetName
		$VMInstanceSize = $VMDetails.InstanceSize
		$VMPowerState = $VMDetails.PowerState
		$VMDNSAddress = $VMDetails.DNSName
		$VMWinRMCertThumbprint = $VMDetails.VM.DefaultWinRMCertificateThumbprint
 
		# Get Azure VM DNS Name
		$VMDNSName = $VMDNSAddress -match "(?<=\//)(.*?)(?=\/)"
		$VMDNSName = $Matches[0]
 
		# Parameter Validation
		if (!$VMAvailabilitySetName) { $VMAvailabilitySetName = "Non-HA" }
 
		Write-Host " "
		Write-Host " "
		Write-Host "VM Details:"
		Write-Host " "
		Write-Host "VM Name: $VMName"
		Write-Host "VM ServiceName: $VMServiceName"
		Write-Host "VM IP Address: $VMIPAddress"
		Write-Host "VM Availability SetName: $VMAvailabilitySetName"
		Write-Host "VM Instance Size: $VMInstanceSize"
		Write-Host "VM Power State: $VMPowerState"
		Write-Host "VM DNS Address: $VMDNSAddress"
		Write-Host "VM DNS Name: $VMDNSName"
		Write-Host "VM WinRM Certificate Thumbprint: $VMWinRMCertThumbprint"
 
		# Get Azure VM Endpoints
		$AzureEndpoints = $VMDetails | Get-AzureEndpoint
 
		Write-Host " "
		Write-Host " "
		Write-Host "VM Endpoint Details:"
 
		foreach ($AzureEndpoint in $AzureEndpoints)
		{
			# Clear Values
			$AzureEndpointLBSetName = $Null;
			$AzureEndpointProbePort = $Null;
			$AzureEndpointProbeProtocol = $Null;
 
			# Get Azure Endpoint Details
			$AzureEndpointName = $AzureEndpoint.Name
			$AzureEndpointLocalPort = $AzureEndpoint.LocalPort
			$AzureEndpointLBSetName = $AzureEndpoint.LBSetName
			$AzureEndpointVip = $AzureEndpoint.Vip
			$AzureEndpointPort = $AzureEndpoint.Port
			$AzureEndpointProtocol = $AzureEndpoint.Protocol
			$AzureEndpointProbePort = $AzureEndpoint.ProbePort
			$AzureEndpointProbeProtocol = $AzureEndpoint.ProbeProtocol
 
			# Parameter Validation
			if (!$AzureEndpointLBSetName) { $AzureEndpointLBSetName = "Non-HA" }
			if (!$AzureEndpointProbePort) { $AzureEndpointProbePort = "Non-HA" }
			if (!$AzureEndpointProbeProtocol) { $AzureEndpointProbeProtocol = "Non-HA" }
 
			Write-Host " "
			Write-Host "Azure Endpoint Name: $AzureEndpointName"
			Write-Host "Azure Endpoint Local Port: $AzureEndpointLocalPort"
			Write-Host "Azure Endpoint LB SetName: $AzureEndpointLBSetName"
			Write-Host "Azure Endpoint Vip: $AzureEndpointVip"
			Write-Host "Azure Endpoint Port: $AzureEndpointPort"
			Write-Host "Azure Endpoint Protocol: $AzureEndpointProtocol"
			Write-Host "Azure Endpoint Probe Port: $AzureEndpointProbePort"
			Write-Host "Azure Endpoint Probe Protocol: $AzureEndpointProbeProtocol"
		}
 
		# Check Azure VM Certificate
		$CheckAzureVMCert = Get-ChildItem -Path Cert:\LocalMachine\Root | Where Thumbprint -eq $VMWinRMCertThumbprint
 
		if (!$CheckAzureVMCert)
		{		
			# Get Azure VM Certificate
			$AzureX509Cert = Get-AzureCertificate -ServiceName $VMServiceName -Thumbprint $VMWinRMCertThumbprint -ThumbprintAlgorithm sha1
 
			# Save Certificate to Temp File
			$CertTempFile = [IO.Path]::GetTempFileName()
			$AzureX509Cert.Data | Out-File $CertTempFile
 
			# Get Local Certificate File
			$LocalCertFile = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2 $CertTempFile
 
			# Import Local Certificate
			$CertStore = New-Object System.Security.Cryptography.X509Certificates.X509Store "Root", "LocalMachine"
			$CertStore.Open([System.Security.Cryptography.X509Certificates.OpenFlags]::ReadWrite)
			$CertStore.Add($LocalCertFile)
			$CertStore.Close()
 
			# Remove Temp File
			Remove-Item $CertTempFile
		}
 
		if ($VMPowerState -eq "Started")
		{
			# Get Azure VM WinRM Uri
			$AzureVMWinRMUri = Get-AzureWinRMUri -ServiceName $VMServiceName -Name $VMName
 
			# Get Azure VM Credentials
			if (!$Credentials) { $Credentials = Get-Credential }
 
			# Get Azure VM Data
			$OSInformation = Invoke-Command -ConnectionUri $AzureVMWinRMUri -ScriptBlock {Get-WmiObject -Class "Win32_OperatingSystem"} -Credential $Credentials
			$CPUInformation = Invoke-Command -ConnectionUri $AzureVMWinRMUri -ScriptBlock {Get-WmiObject -Class "Win32_Processor"} -Credential $Credentials
			$DiskInformation = Invoke-Command -ConnectionUri $AzureVMWinRMUri -ScriptBlock {Get-WmiObject -Class "Win32_LogicalDisk" | Where DeviceID -eq "C:"} -Credential $Credentials
 
			if ($OSInformation -and $CPUInformation -and $DiskInformation)
			{
				# Get Azure VM Resource Usage
				$AzureVMCPUName = $CPUInformation[0].Name
				$AzureVMCPUSocket = @($CPUInformation).Count
				$AzureVMCPUCount = $CPUInformation[0].NumberOfCores * $AzureVMCPUSocket
				$AzureVMCPULoad = $CPUInformation | Measure-Object -Property LoadPercentage -Sum
				$AzureVMCPUUsage = [math]::round(($AzureVMCPULoad.Sum / $AzureVMCPULoad.Count), 0)
				$AzureVMTotalMemory = ([math]::round(($OSInformation.TotalVisibleMemorySize / 1MB), 1))
				$AzureVMFreeMemory = ([math]::round(($OSInformation.FreePhysicalMemory / 1MB), 1))
				$AzureVMTotalMemoryUsage = [int]$AzureVMTotalMemory - [int]$AzureVMFreeMemory
				$AzureVMTotalDisk = ([math]::round(($DiskInformation.Size / 1GB), 1))
				$AzureVMFreeDisk = ([math]::round(($DiskInformation.FreeSpace / 1GB), 1))
				$AzureVMTotalDiskUsage = [int]$AzureVMTotalDisk - [int]$AzureVMFreeDisk
				$AzureVMDiskReadIO = Invoke-Command -ConnectionUri $AzureVMWinRMUri -ScriptBlock {[math]::round(((Get-Counter -Counter "\LogicalDisk(C:)\Disk Reads/Sec").CounterSamples[0].CookedValue), 0)} -Credential $Credentials
				$AzureVMDiskWriteIO = Invoke-Command -ConnectionUri $AzureVMWinRMUri -ScriptBlock {[math]::round(((Get-Counter -Counter "\LogicalDisk(C:)\Disk Writes/Sec").CounterSamples[0].CookedValue), 0)} -Credential $Credentials
				$ActiveVMCount = [int]$ActiveVMCount + 1;				
 
				Write-Host " "
				Write-Host "CPU Name: $AzureVMCPUName"
				Write-Host "CPU Count: $AzureVMCPUCount"
				Write-Host "CPU Usage: $AzureVMCPUUsage"
				Write-Host "Total Memory: $AzureVMTotalMemory GB"
				Write-Host "Free Memory: $AzureVMFreeMemory GB"
				Write-Host "Total Disk: $AzureVMTotalDisk GB"
				Write-Host "Free Disk: $AzureVMFreeDisk GB"
				Write-Host "Disk Read IO: $AzureVMDiskReadIO"
				Write-Host "Disk Write IO: $AzureVMDiskWriteIO"
 
				# VM Reports
				$VMReportsXML += " <OperationResult>`n"
				$VMReportsXML += "  <VMName>$VMName</VMName>`n"
				$VMReportsXML += "  <ProcessorCount>$AzureVMCPUCount</ProcessorCount>`n"
				$VMReportsXML += "  <MemoryLimit>$AzureVMTotalMemory</MemoryLimit>`n"
				$VMReportsXML += "  <TotalDisk>$AzureVMTotalDisk</TotalDisk>`n"
				$VMReportsXML += "  <VMReadIO>$AzureVMDiskReadIO</VMReadIO>`n"
				$VMReportsXML += "  <VMWriteIO>$AzureVMDiskWriteIO</VMWriteIO>`n"
				$VMReportsXML += "  <VMState>$VMPowerState</VMState>`n"
				$VMReportsXML += " </OperationResult>`n"
			}
			else
			{
				# Get Azure VM Resource Usage
				$AzureVMCPUCount = 0;
				$AzureVMCPUUsage = 0;
				$AzureVMTotalMemory = 0;
				$AzureVMFreeMemory = 0;
				$AzureVMTotalMemoryUsage = 0;
				$AzureVMTotalDisk = 0;
				$AzureVMFreeDisk = 0;
				$AzureVMTotalDiskUsage = 0;
				$AzureVMDiskReadIO = 0;
				$AzureVMDiskWriteIO = 0;
 
				# VM Reports
				$VMReportsXML += " <OperationResult>`n"
				$VMReportsXML += "  <VMName>$VMName</VMName>`n"
				$VMReportsXML += "  <ProcessorCount>$AzureVMCPUCount</ProcessorCount>`n"
				$VMReportsXML += "  <MemoryLimit>$AzureVMTotalMemory</MemoryLimit>`n"
				$VMReportsXML += "  <TotalDisk>$AzureVMTotalDisk</TotalDisk>`n"
				$VMReportsXML += "  <VMReadIO>$AzureVMDiskReadIO</VMReadIO>`n"
				$VMReportsXML += "  <VMWriteIO>$AzureVMDiskWriteIO</VMWriteIO>`n"
				$VMReportsXML += "  <VMState>$VMPowerState</VMState>`n"
				$VMReportsXML += " </OperationResult>`n"
			}
		}
		else
		{
			# Get Azure VM Resource Usage
			$AzureVMCPUCount = 0;
			$AzureVMCPUUsage = 0;
			$AzureVMTotalMemory = 0;
			$AzureVMFreeMemory = 0;
			$AzureVMTotalMemoryUsage = 0;
			$AzureVMTotalDisk = 0;
			$AzureVMFreeDisk = 0;
			$AzureVMTotalDiskUsage = 0;
			$AzureVMDiskReadIO = 0;
			$AzureVMDiskWriteIO = 0;
 
			# VM Reports
			$VMReportsXML += " <OperationResult>`n"
			$VMReportsXML += "  <VMName>$VMName</VMName>`n"
			$VMReportsXML += "  <ProcessorCount>$AzureVMCPUCount</ProcessorCount>`n"
			$VMReportsXML += "  <MemoryLimit>$AzureVMTotalMemory</MemoryLimit>`n"
			$VMReportsXML += "  <TotalDisk>$AzureVMTotalDisk</TotalDisk>`n"
			$VMReportsXML += "  <VMReadIO>$AzureVMDiskReadIO</VMReadIO>`n"
			$VMReportsXML += "  <VMWriteIO>$AzureVMDiskWriteIO</VMWriteIO>`n"
			$VMReportsXML += "  <VMState>$VMPowerState</VMState>`n"
			$VMReportsXML += " </OperationResult>`n"
		}
 
		# Calculations
		$VMCount = [int]$VMCount + 1;
		$VMTotalvCPU = [int]$VMTotalvCPU + [int]$AzureVMCPUCount;
		$VMTotalCPUUsage = [int]$VMTotalCPUUsage + [int]$AzureVMCPUUsage;
		$VMTotalMemory = [int]$VMTotalMemory + [int]$AzureVMTotalMemory
		$VMTotalMemoryUsage = [int]$VMTotalMemoryUsage + [int]$AzureVMTotalMemoryUsage
		$VMFreeMemory = [int]$VMFreeMemory + [int]$AzureVMFreeMemory
		$VMTotalDisk = [int]$VMTotalDisk + [int]$AzureVMTotalDisk
		$VMTotalDiskUsage = [int]$VMTotalDiskUsage + [int]$AzureVMTotalDiskUsage
		$VMFreeDisk = [int]$VMFreeDisk + [int]$AzureVMFreeDisk
	}
 
	[int]$VMTotalCPUUsage = ([math]::round(($VMTotalCPUUsage / $ActiveVMCount), 0))
	$FreeCPUPercent = 100 - [int]$VMTotalCPUUsage;
 
	# General Stats
	$GeneralStatsXML += " <OperationResult>`n"
	$GeneralStatsXML += "  <ServiceName>$VMServiceName</ServiceName>`n"
	$GeneralStatsXML += "  <VMCount>$VMCount</VMCount>`n"
	$GeneralStatsXML += "  <TotalvCPU>$VMTotalvCPU</TotalvCPU>`n"
	$GeneralStatsXML += "  <TotalCPUUsage>$VMTotalCPUUsage</TotalCPUUsage>`n"
	$GeneralStatsXML += "  <FreeCPUPercent>$FreeCPUPercent</FreeCPUPercent>`n"
	$GeneralStatsXML += "  <FreeMemory>$VMFreeMemory</FreeMemory>`n"
	$GeneralStatsXML += "  <TotalMemoryUsage>$VMTotalMemoryUsage</TotalMemoryUsage>`n"
	$GeneralStatsXML += "  <TotalMemory>$VMTotalMemory</TotalMemory>`n"
	$GeneralStatsXML += "  <FreeDiskSpace>$VMFreeDisk</FreeDiskSpace>`n"
	$GeneralStatsXML += "  <TotalDiskUsage>$VMTotalDiskUsage</TotalDiskUsage>`n"
	$GeneralStatsXML += "  <TotalDiskSpace>$VMTotalDisk</TotalDiskSpace>`n"
	$GeneralStatsXML += " </OperationResult>`n"
 
	# Append Stats XML Footer
	$GeneralStatsXML += "</Result>`n"
 
	# Append VM Reports XML Footer
	$VMReportsXML += "</Result>`n"
 
	# Remove old statistics
	Remove-Item -Path "C:\inetpub\wwwroot\xml\vm\reports.xml" -EA SilentlyContinue
	Remove-Item -Path "C:\inetpub\wwwroot\xml\statistics.xml" -EA SilentlyContinue
 
	# Export new statistics
	Add-Content -Value $VMReportsXML -Path "C:\inetpub\wwwroot\xml\vm\reports.xml"
	Add-Content -Value $GeneralStatsXML -Path "C:\inetpub\wwwroot\xml\statistics.xml"
 
	#$VMTotalCPUUsage = "50"
 
	# Autoscaling
	if ($VMTotalCPUUsage -gt "40")
	{
		# Get Azure Virtual Machines
		Get-AzureVM | Where ServiceName -eq "AzureWebFarm" | Where PowerState -eq "Stopped" | Start-AzureVM
	}
 
	# Prepare for Next Job
	Write-Host " "
	Start-Sleep 60
}

Our autoscale part is here:

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	# Autoscaling
	if ($VMTotalCPUUsage -gt "40")
	{
		# Get Azure Virtual Machines
		Get-AzureVM | Where ServiceName -eq "AzureWebFarm" | Where PowerState -eq "Stopped" | Start-AzureVM
	}

As you see, I started all VMs. But you can start VMs one by one or you can shutdown a VM if CPU usage is not high.



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