VM Scale Sets for auto scaling in Azure - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an Azure VM Scale Set?

An Azure VM Scale Set is a group of identical virtual machines that can automatically increase or decrease in number to handle changes in demand.

beginner

How does auto scaling work in VM Scale Sets?

Auto scaling adjusts the number of VMs in the scale set based on rules like CPU usage or schedule, so your app can handle more users or save costs when demand is low.

intermediate

What is a scale-in policy in VM Scale Sets?

A scale-in policy controls how VMs are removed when scaling down, for example, removing the oldest VM first or the one with the least load.

beginner

Why use VM Scale Sets instead of single VMs?

VM Scale Sets provide automatic scaling and high availability, so your app stays responsive and reliable without manual intervention.

intermediate

What metrics can trigger auto scaling in VM Scale Sets?

Common metrics include CPU usage, memory usage, disk I/O, and custom metrics you define to decide when to add or remove VMs.

What does a VM Scale Set automatically adjust?

A The network bandwidth

B The size of each virtual machine

C The operating system of VMs

D The number of virtual machines

VM Scale Sets automatically adjust the number of virtual machines to meet demand.

Which metric is commonly used to trigger scaling in VM Scale Sets?

A CPU usage

B Number of users logged in

C Disk size

D VM color

CPU usage is a common metric to trigger scaling actions.

What happens when demand decreases in a VM Scale Set with auto scaling?

A VMs change their operating system

B The number of VMs increases

C The number of VMs decreases

D Nothing changes

When demand decreases, auto scaling reduces the number of VMs to save costs.

Which of these is NOT a benefit of VM Scale Sets?

A Manual VM configuration for each instance

B High availability

C Load balancing

D Automatic scaling

VM Scale Sets use identical VMs and do not require manual configuration for each instance.

What is a scale-in policy used for?

A To add more VMs when demand increases

B To decide which VMs to remove when scaling down

C To upgrade VM operating systems

D To monitor network traffic

Scale-in policies control which VMs are removed during scale down.

Explain how VM Scale Sets help manage application demand automatically.

Think about how a store adds or removes cashiers depending on customer lines.

Describe what a scale-in policy is and why it matters in VM Scale Sets.

Imagine deciding which workers leave first when a store gets less busy.