Configuring an Ubuntu VM Scale Set in Azure with Auto-Scaling Parameters

Module 4: Assignment - 3

Tasks To Be Performed:

1. Create a VM scale set with Ubuntu as OS
2. Give min VM’s as 1 and maximum as 5
3. For scale-out CPU % is 75 and increase by 1 VM
4. For scale-in CPU % is 25 increase by 1 VM

Step 1: Create a VM Scale Set with Ubuntu OS §

1. I Log into the Azure Portal:

   • I open a web browser and navigate to the Azure Portal. I sign in with my credentials.

2. I Navigate to VM Scale Sets:

   • In the Azure Portal, I select “Virtual machine scale sets” from the menu or search for it in the search bar.

3. I Create the VM Scale Set:

   • I click on “Create” to start the process of creating a new VM scale set.
   • In the “Basics” tab, I select the appropriate subscription and resource group (or create a new one if necessary).
   • I enter a name for the scale set.
   • Under “Region”, I choose the region where I want to deploy the scale set.
   • For the “Image”, I select an Ubuntu Server image.

Step 2: Configure the VM Scale Set §

1. I Set the Instance Count:

   • In the “Scaling” section, I set the initial instance count to 1, as I want the minimum number of VMs to be 1.

2. I Configure the VM Size and Settings:

   • I select the VM size according to my requirements.
   • I configure other settings like networking, storage, and monitoring as needed.

Step 3: Enable and Configure Auto-Scaling §

1. I Enable Auto-Scaling:

   • In the “Scaling” section, I enable the auto-scaling feature.

2. I Configure Scale-Out Settings:
   

   • I set the “Scale-out” threshold at 75% CPU usage.
   • I specify that the scale-out action should increase the instance count by 1.
   • I ensure the maximum number of VMs is set to 5.

3. I Configure Scale-In Settings:

   • I set the “Scale-in” threshold at 25% CPU usage.
   • I specify that the scale-in action should decrease the instance count by 1.

Step 4: Review and Create the VM Scale Set §

1. I Review the Configuration:

   • I go through the settings to ensure everything is configured correctly for my requirements.

2. I Create the VM Scale Set:

   • After reviewing, I click “Review + create” to deploy the VM scale set.
   • I make sure to download key
     

I login to it to stress it

In networking tab had to edit the NIC to allow inboud SSH

To simulate high CPU usage in the EC2 instances, I mirrored the approach from Assignment 4 – CloudWatch Dashboard . Specifically, I executed the command:

while true; do openssl dgst -sha256 /dev/zero; done

Before:
After:

More Vm span, not sure why 2 more

In the scaletset’s monitoring tab I see the CPU spike I created