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Document spot instance behaviour #508

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4 changes: 3 additions & 1 deletion docs/webapp/applications/apps_aws_autoscaler.md
Expand Up @@ -41,6 +41,8 @@ each instance is spun up.
* Resource Name - Assign a name to the resource type. This name will appear in the Autoscaler dashboard
* EC2 Instance Type - See [Instance Types](https://aws.amazon.com/ec2/instance-types) for full list of types
* Use Spot Instance - Check box to use a spot instance. Else, a reserved instance is used
* Regular Instance Rollback Timeout - Controls when the autoscaler will revert to starting a regular instance after failing to start a spot instance. It will first attempt to start a spot, and then wait and retry again and again. Once the time it waited exceeded the Regular Instance Rollback Timeout, the autoscaler will try to start a regular instance instead. This is for a specific attempt, where starting a spot fails and an alternative instance needs to be started.
* Spot Instance Blackout Period - Specifies a blackout period after failing to start a spot instance. This is related to future attempts: after failing to start a spot instance, all requests to start additional spot instances will be converted to attempts to start regular instances, as a way of "easing" the spot requests load on the cloud provider and not creating a "DOS" situation in the cloud account which might cause the provider to refuse creating spots for a longer period.
* Availability Zone - The [EC2 availability zone](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.RegionsAndAvailabilityZones.html#Concepts.RegionsAndAvailabilityZones.AvailabilityZones)
to launch this resource in
* AMI ID - The AWS AMI to launch
Expand Down Expand Up @@ -227,4 +229,4 @@ The policy includes the following permissions:
}
]
}
```
```