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Cloud Computing · Intermediate

Virtual Machine Scale Sets (VMSS)

Azure compute resource for deploying and automatically scaling a group of load-balanced VMs.

Definition

Scale sets manage identical or mixed VMs with Flexible or Uniform orchestration, distribute instances across fault domains or availability zones, and autoscale on metrics or schedules. They integrate with Azure Load Balancer and Application Gateway and support automatic OS image upgrades and Spot instances.

Example

A scale set adds VMs when average CPU exceeds 70 percent for 10 minutes and removes them when it drops below 30 percent.

Exam tip

VMSS is Azure's equivalent of an AWS Auto Scaling group.

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