what is a virtual machine set scale
A Virtual Machine Scale Set (VMSS) is an Azure feature that lets you create and manage a group of identical virtual machines that can automatically scale up (add more VMs) or scale down (remove VMs) based on workload demand.
Step 1
In the search bar, type "azure compute gallery " and click it.
Click + Create.
Step 2 configure basic on the azure compute gallery and click on review and create
click on create
Step 3
Select Region
Choose East US as the region where your VM image will be stored.
Choose Image Sharing Option
Yes, share to a gallery → Saves image in Azure Compute Gallery for reuse.
No → Creates a one-off managed image (less reusable).
Decide on Automatic VM Deletion
Tick Automatically delete VM if you no longer need the original VM after capturing the image.
Leave unticked if you want to keep using the VM.
Set Gallery Details
Target Azure Compute Gallery → Select healthgallery or create a new one.
Choose Operating System State
Generalized → Wipes personal settings; new VMs will require hostname, admin setup. (Recommended for reusable images)
Specialized → Keeps all settings exactly as is. (Best for cloning exact setups)
Name the VM Image Definition
Set as (new) healthimage or another descriptive name.
Fill in Version Details
Version number → Start with 0.0.1.
Exclude from latest → Tick if you don’t want this version to be default.
End of life date → Set to 08/31/2025 (or your chosen date).
Block deletion before end of life → Optional protection setting.
Configure Replication
Target regions → Choose where else to store the image.
Replica count → Number of copies per region.
Storage SKU → Select Standard HDD, Premium SSD, or Zone-redundant.
Create the Image
Review all settings.
Click Create to start the capture process.
Wait for Azure to complete the operation.
Set Username and Password/Key.
Step 4
Configure the Basics on virtual machine scale set
Subscription → Choose your Azure subscription.
Resource Group → Select an existing group or create a new one.
Scale set name → Enter a unique name (e.g., myVMSS).
Region → Choose the deployment location.
Orchestration mode → Usually keep as Uniform (all VMs are identical).
Image → Choose the OS (Windows Server, Ubuntu, etc.).
Size → Select a VM size (based on CPU, RAM needs).
Authentication type →
Password
Click on create
Step 5
Test Your VMSS
Go to your scale set.
increase the number of virtual machine
Check Instances → see all VM instances running.
Test scaling by increasing/decreasing instance count or triggering autoscale rules.
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