# Example Capacity Reservation Fleet configurations
<a name="crfleet-example-configs"></a>

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
    }
]
```