Example Capacity Reservation Fleet configurations

The following example creates a Capacity Reservation Fleet that uses two instance types: m5.4xlarge and m5.12xlarge.

It uses a weighting system based on the number of vCPUs provided by the specified instance types. The total target capacity is 480 vCPUs. The m5.4xlarge provides 16 vCPUs and gets a weight of 16, while the m5.12xlarge provides 48 vCPUs and gets a weight of 48. This weighting system configures the Capacity Reservation Fleet to reserve capacity for either 30 m5.4xlarge instances (480/16=30), or 10 m5.12xlarge instances (480/48=10).

The Fleet is configured to prioritize the m5.12xlarge capacity and gets priority of 1, while the m5.4xlarge gets a lower priority of 2. This means that the fleet will attempt to reserve the m5.12xlarge capacity first, and only attempt to reserve the m5.4xlarge capacity if Amazon EC2 has insufficient m5.12xlarge capacity.

The Fleet reserves the capacity for Windows instances and the reservation automatically expires on October 31, 2021 at 23:59:59 UTC.

aws ec2 create-capacity-reservation-fleet \
--total-target-capacity 480 \
--allocation-strategy prioritized \
--instance-match-criteria open \
--tenancy default \
--end-date 2021-10-31T23:59:59.000Z \
--instance-type-specifications file://instanceTypeSpecification.json

The following is the contents of instanceTypeSpecification.json.

[
    {             
        "InstanceType": "m5.4xlarge",                        
        "InstancePlatform":"Windows",            
        "Weight": 16,
        "AvailabilityZone":"us-east-1a",        
        "EbsOptimized": true,            
        "Priority" : 2
    },
    {             
        "InstanceType": "m5.12xlarge",                        
        "InstancePlatform":"Windows",            
        "Weight": 48,
        "AvailabilityZone":"us-east-1a",        
        "EbsOptimized": true,            
        "Priority" : 1
	}
]