Azure Classroomnotes 01/Mar/2023

Azure VMSS Autoscaling

  • Create a VMSS with image from compute gallery with autoscaling
    • min: 1
    • max: 5
    • scale out by 1 if cpu utilization > 60%
    • scale in by 1 if cpu utilization < 40%
  • We have artificially stressed the VM in VMSS using
stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 100m -v
  • The instances in VMSS before we started execution are 1, lets wait for 5-10 mins and check for the results
  • By default we can scale using host based metrics
    • CPU
    • RAM
    • Disk utilization
  • If you need to scale with Application level metrics we can use application insights Refer Here and also from diagnostic extension Refer Here

Rolling updates to VMSS

  • Ensure your upgrade policy is not manual.
  • Create a new version of the image in compute gallery/image definition and as the upgrade policy is automatic, it should upgrade the vmss with new image version.
  • After the image rollout is complete you should be seeing the new image deployed in vmss without downtime.

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