LAB 08 : VM Scaleset

 Objective : deploy Azure virtual machine scale set across availability zones by using the Azure portal.

1.    Create VM Scale Set

Accept Default Values in Disk

Networking - Create a Vnet

Edit Network interface and create a new inbound rule

Enable Public IP Address

Enable Load Balancer

Scaling -Set instance count and policy

Management - Ensure boot diagonistics is enable

Management - Create new diagnostics storage account

Health- Accept Default Values

Advanced - Spreading Algo : Fixed Spreading

2.    Configure Azure virtual machine scale sets by using virtual machine extensions

Objective: Install Windows Server Web Server role on the instances of the Azure virtual machine scale set you deployed in the previous task by using the Custom Script virtual machine extension.

Storage account- add a new container

Storage account- Upload the script

VM Scaleset Add Extensions - Custom Script Extension

Add the custom script extensions

Upgrade the VM instances

Validation

In the Azure portal, search for and select Load balancers and, in the list of load balancers, click az10408vmss0lb.

On the az10408vmss0lb blade, note the value of the Public IP address assigned to the frontend of the load balancer, open an new browser tab, and navigate to that IP address.

3. Scale compute and storage for Azure virtual machine scale sets

Change the size of virtual machine scale set instances, configure their autoscaling settings, and attach disks to them.

Upgrade the instances as oer the VM Scaleset

Scaling the VM Scale Set : -Custom autoscale and Scale based on a metric

Add the Rule for auto scaling

Setting	Value
Metric source	Current resource (az10480vmss0)
Time aggregation	Average
Metric namespace	Virtual Machine Host
Metric name	Network In Total
Operator	Greater than
Metric threshold to trigger scale action	10
Duration (in minutes)	1
Time grain statistic	Average
Operation	Increase count by
Instance count	1
Cool down (minutes)	5

Set Instance Limit Values

Validation of auto scaling

$rgName = 'az104-08-rg02'

$lbpipName = 'az10408vmss0-ip'

$pip = (Get-AzPublicIpAddress -ResourceGroupName $rgName -Name $lbpipName).IpAddress

while ($true) { Invoke-WebRequest -Uri "http://$pip" }

Click refresh in the list of instances after few minutes and we can see maximum 3 instances

Attach a disk :- 

Save the change, in the Settings section of the az10408vmss0 blade, click Instances, select the checkboxes next to the two instances of the virtual machine scale set, click Upgrade, and then, when prompted for confirmation, click Yes.

The disk attached in the previous step is a raw disks. Before it can be used, it is necessary to create a partition, create a filesystem, and mount it. To accomplish this, you will use Azure virtual machine Custom Script extension. First, you will need to remove the existing Custom Script Extension.

Uninstall the custom script extensions

In the azure power shell, click the Upload/Download files icon, in the drop-down menu, click Upload and upload the file \Allfiles\Labs\08\az104-08-configure_VMSS_disks.ps1 into the Cloud Shell home directory.

The content is as below

$rgName = 'az104-08-rg02'

$vmssName = 'az10408vmss0'

$vmss = Get-AzVmss `

-ResourceGroupName $rgName `

-VMScaleSetName $vmssName

$publicSettings = @{

"fileUris" = (,"https://raw.githubusercontent.com/Azure-Samples/compute-automation-configurations/master/prepare_vm_disks.ps1");

"commandToExecute" = "powershell -ExecutionPolicy Unrestricted -File prepare_vm_disks.ps1"

}

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 $rgName `

-Name $vmssName `

-VirtualMachineScaleSet $vmss

Run following commands

Set-Location -Path $HOME

Get-Content -Path ./az104-08-configure_VMSS_disks.ps1
./az104-08-configure_VMSS_disks.ps1

In the Settings section of the az10408vmss0 blade, click Instances, select the checkboxes next to the two instances of the virtual machine scale set, click Upgrade, and then, when prompted for confirmation, click Yes.

Delete all resources

Get-AzResourceGroup -Name 'az104-08*' | Remove-AzResourceGroup -Force -AsJob