EC2 Spot Instances
Can get a discount of up to 90% compared to On-demand
Instances that you can “lose” at any point of time if your max price is less than the current spot price
The MOST cost-efficient instances in AWS
Useful for workloads that are resilient to failure
Batch jobs
Data analysis
Image processing
Any distributed workloads
Workloads with a flexible start and end time
Not suitable for critical jobs or databases.
EC2 Spot Instance Requests
Can get a discount of up to 90% compared to On-demand.
Define max spot price and get the instance while current spot price < max.
The hourly spot price varies based on offer and capacity.
If the current spot price > your max price you can choose to stop or terminate your instance with a 2 minute grace period.
Other strategy: Spot Block
“block” spot instance during a specified time frame (1 to 6 hours) without interruptions
In rare situations, the instance may be reclaimed.
Used for batch jobs, data analysis, or workloads that are resilient to failures.
Not great for critical jobs or databases.
Terminating Spot Instances
Spot Fleets
Spot Fleets = set of Spot Instances + (optional) On-Demand Instances
The Spot Fleet will try to meet the target capacity with price constraints
Define possible launch pools: instance type (m5.large), OS, Availability Zone
Can have multiple launch pools, so that the fleet can choose
Spot Fleet stops launching instances when reaching capacity or max cost
Strategies to allocate Spot Instances:
lowestPrice: from the pool with the lowest price (cost optimization, short workload)
diversified: distributed across all pools (great for availability, long workloads)
capacityOptimized: pool with the optimal capacity for the number of instances
Spot Fleets allow us to automatically request Spot Instances with the lowest price
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