047 ec2 spot
- discount up to 90% vs on-demand
- Define max spot price and get the instance while current spot price < max
For batch jobs, data analysis or workloads that are resilient to failures
Not great for critical jobs or DBs
EC2 Spot instances pricing
When price goes over user-defined max price
- lose the instance
When price goes below user-defined max price
- win the instance
How to terminate Spot Instances
Request type
- one-time
- persistent
You can only cancel a Spot Instance requests that are open, active or disabled
You must 1. cancel a Spot request and then 2. terminate the associated Spot instances
Spot Fleets
A set of Spot Instances & optional on-demand instances
Spot Fleet tries to meet the target capacity with price constraints
- Define possible launch pools
- Can have multiple launch pools
- Spot Fleet stops launching instances when reaching capacity or max cost
Spot fleets allow us to automatically request Spot Instances with the lowest price
Strategies
lowestPrice
from the pool with the lowest price
diversified
distributed across all pools
great for availaility, long workloads
capacityOptimized
pool with the optimal capacity for the number of instances
priceCapacityOptimized (recommended)
pools with highest capacity available, then select the pool with the lowest price