05_Create_vm_scale_set.ps1

Set-Location c:\
Clear-Host

Install-Module -Name Az -Force -AllowClobber -Verbose

Connect-AzAccount

#Create a scale set
New-AzVmss `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -Location "WestEurope" `
  -VMScaleSetName "myScaleSet" `
  -VirtualNetworkName "myVnet" `
  -SubnetName "mySubnet" `
  -PublicIpAddressName "myPublicIPAddress" `
  -LoadBalancerName "myLoadBalancer" `
  -UpgradePolicyMode "Automatic"

#Deploy sample application

#Define the script for your Custom Script Extension to run
$publicSettings = @{
    "fileUris" = (,"https://raw.githubusercontent.com/Azure-Samples/compute-automation-configurations/master/automate-iis.ps1");
    "commandToExecute" = "powershell -ExecutionPolicy Unrestricted -File automate-iis.ps1"
}

#Get information about the scale set
$vmss = Get-AzVmss `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -VMScaleSetName "myScaleSet"

#Use Custom Script Extension to install IIS and configure basic website
Add-AzVmssExtension -VirtualMachineScaleSet $vmss `
  -Name "customScript" `
  -Publisher "Microsoft.Compute" `
  -Type "CustomScriptExtension" `
  -TypeHandlerVersion 1.8 `
  -Setting $publicSettings

#Update the scale set and apply the Custom Script Extension to the VM instances
Update-AzVmss `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -Name "myScaleSet" `
  -VirtualMachineScaleSet $vmss

#Allow traffic to application

#Get information about the scale set
$vmss = Get-AzVmss `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -VMScaleSetName "myScaleSet"

#Create a rule to allow traffic over port 80
$nsgFrontendRule = New-AzNetworkSecurityRuleConfig `
  -Name myFrontendNSGRule `
  -Protocol Tcp `
  -Direction Inbound `
  -Priority 200 `
  -SourceAddressPrefix * `
  -SourcePortRange * `
  -DestinationAddressPrefix * `
  -DestinationPortRange 80 `
  -Access Allow

#Create a network security group and associate it with the rule
$nsgFrontend = New-AzNetworkSecurityGroup `
  -ResourceGroupName  "myResourceGroupScaleSet" `
  -Location WestEurope `
  -Name myFrontendNSG `
  -SecurityRules $nsgFrontendRule

$vnet = Get-AzVirtualNetwork `
  -ResourceGroupName  "myResourceGroupScaleSet" `
  -Name myVnet

$frontendSubnet = $vnet.Subnets[0]

$frontendSubnetConfig = Set-AzVirtualNetworkSubnetConfig `
  -VirtualNetwork $vnet `
  -Name mySubnet `
  -AddressPrefix $frontendSubnet.AddressPrefix `
  -NetworkSecurityGroup $nsgFrontend

Set-AzVirtualNetwork -VirtualNetwork $vnet

# Update the scale set and apply the Custom Script Extension to the VM instances
Update-AzVmss `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -Name "myScaleSet" `
  -VirtualMachineScaleSet $vmss

#Test your scale set

Get-AzPublicIPAddress `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -Name "myPublicIPAddress" | select IpAddress

#Open browser

#Management tasks
Get-AzVmssVM `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -VMScaleSetName "myScaleSet"

Get-AzVmssVM `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -VMScaleSetName "myScaleSet" `
  -InstanceId "1"

#Get current scale set
$scaleset = Get-AzVmss `
  -ResourceGroupName "myResourceGroupScaleSet" `
  -VMScaleSetName "myScaleSet"

#Set and update the capacity of your scale set
$scaleset.sku.capacity = 3
Update-AzVmss -ResourceGroupName "myResourceGroupScaleSet" `
    -Name "myScaleSet" `
    -VirtualMachineScaleSet $scaleset

#Configure autoscale rules

#region Rules
Rather than manually scaling the number of instances in your scale set, you define autoscale rules. 
These rules monitor the instances in your scale set and respond accordingly based on metrics and thresholds 
you define. The following example scales out the number of instances by one when the average CPU load is 
greater than 60% over a 5-minute period. If the average CPU load then drops below 30% over a 5-minute period, 
the instances are scaled in by one instance
#endregion Rules

#Define your scale set information
$mySubscriptionId = (Get-AzSubscription)[0].Id
$myResourceGroup = "myResourceGroupScaleSet"
$myScaleSet = "myScaleSet"
$myLocation = "WestEurope"
$myScaleSetId = (Get-AzVmss -ResourceGroupName $myResourceGroup -VMScaleSetName $myScaleSet).Id 

#Create a scale up rule to increase the number instances after 60% average CPU usage exceeded for a 5-minute period
$myRuleScaleUp = New-AzAutoscaleRule `
  -MetricName "Percentage CPU" `
  -MetricResourceId $myScaleSetId `
  -Operator GreaterThan `
  -MetricStatistic Average `
  -Threshold 60 `
  -TimeGrain 00:01:00 `
  -TimeWindow 00:05:00 `
  -ScaleActionCooldown 00:05:00 `
  -ScaleActionDirection Increase `
  -ScaleActionValue 1

#Create a scale down rule to decrease the number of instances after 30% average CPU usage over a 5-minute period
$myRuleScaleDown = New-AzAutoscaleRule `
  -MetricName "Percentage CPU" `
  -MetricResourceId $myScaleSetId `
  -Operator LessThan `
  -MetricStatistic Average `
  -Threshold 30 `
  -TimeGrain 00:01:00 `
  -TimeWindow 00:05:00 `
  -ScaleActionCooldown 00:05:00 `
  -ScaleActionDirection Decrease `
  -ScaleActionValue 1

#Create a scale profile with your scale up and scale down rules
$myScaleProfile = New-AzAutoscaleProfile `
  -DefaultCapacity 2  `
  -MaximumCapacity 10 `
  -MinimumCapacity 2 `
  -Rule $myRuleScaleUp,$myRuleScaleDown `
  -Name "autoprofile"

#Apply the autoscale rules
Add-AzAutoscaleSetting `
  -Location $myLocation `
  -Name "autosetting" `
  -ResourceGroup $myResourceGroup `
  -TargetResourceId $myScaleSetId `
  -AutoscaleProfile $myScaleProfile



Remove-AzResourceGroup `
   -Name "myResourceGroupScaleSet" `
   -Force






#https://docs.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-create-vmss
#https://docs.microsoft.com/en-us/azure/architecture/best-practices/auto-scaling