Appstream Scheduled Scaling Policy

Question

Our Appstream fleet has a scaling policy to add 2 machines if utilization is above 80% and remove 1 machine if utilization is below 70%. This works fine for most of the day but it can't handle the initial 3 hour usage surge that starts at 5:15 UTC Monday through Friday.

I have a CHRON expression 0 15 5 ? * MON-FRI * in the Scheduled Scaling Policies box set for 45 minimum and 50 maximum to handle the rush.  This is ok but I only want this CHRON rule to be in effect for 3 hours and then allow the fleet to scale down normally using the rules in the first paragraph above.  Only during this period 5:15am - 8:15am do I want to manually set a minimum. The rest of the time should be set by utilization percentage.  Thanks

Accepted Answer

Hello.
To achieve your desired outcome:
**Continue with the utilization-based scaling policy as you described:**
```
Increase capacity by 2 instances when utilization is above 80%.
Decrease capacity by 1 instance when utilization is below 70%.
```
**Use two CRON expressions to handle the morning surge:**
```
First CRON expression at 5:15 UTC (0 15 5 ? * MON-FRI *): Set the minimum capacity to 45 and the maximum capacity to 50.
Second CRON expression at 8:15 UTC (0 15 8 ? * MON-FRI *): Set the minimum capacity back to its default value (could be 0 or a suitable number for your needs) and the maximum capacity to a higher value if needed (or you can leave it unrestricted).
```
Regards, Andrii

Answer

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Appstream Scheduled Scaling Policy

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