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Autoscaling

Autoscaling automatically adjusts the number of running instances based on demand to maintain performance and control costs.

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Instructions

1

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Navigate to your App Service Plan's Autoscale Settings

Azure Portal > App Service Plans > Your SCEPman App Service Plan > Settings > Scale out

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Please ensure that your App Service plan uses at least the S1 or P0V3 pricing tier. Lower tiered plans may not provide multiple instances.

2

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Select Rules Based Autoscaling

Select Rules Based, then Configure to proceed.

3

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Configure Autoscale Settings

To scale the instance count based on the current load of the service there must be two scaling rule conditions added. One rule to increase the instance count on heavy load and one rule to decrease the instance count after the load is reduced again.

  1. Select Custom autoscale

  2. Type in an appropriate name in Autoscale setting name

  3. Select Scale based on a metric to enable autoscaling based on a defined rule set

  4. Set the instance limits in line with your business requirements:

    • Minimum

    • Maximum

    • Default

  5. Select Add a rule once you're ready to configure your Autoscaling rules

4

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Configure Autoscaling Rules

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We recommend the following settings of the increase and decrease rules. But please keep in mind that this can depend on your workload and needs to be monitored and optimized!

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Increase Instance Count Rule

  1. Enable metric divided by instance count

  2. Choose Greater than as the Operator and set the threshold to 70 (percent)

  3. Set the duration to 10 (minutes)

  4. Ensure that the Time grain statistic is set to Average

  5. Ensure that the Operation is set to Increase count by

  6. Set the Cool down (minutes) to 15 (minutes)

  7. Check the Instance count (1) that will be added to the current instances

  8. Click Add when done

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Decrease Instance Count Rule

  1. Select Add a rule to add an additional rule

  2. Enable metric divided by instance count

  3. Choose Less than as the Operator and set the threshold to 35 (percent)

  4. Set the duration to 20 (minutes)

  5. Ensure that the Time grain statistic is set to Average

  6. Ensure that the Operation is set to Decrease count by

  7. Set the Cool down (minutes) to 30 (minutes)

  8. Check the Instance count (1) that will be removed from the current instances

  9. Click Add when done

5

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Save Autoscale Settings

Congratulations! Your App Service Plan will now scale up and down in accordance with your rules.

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