# Create a Capacity Reservation Fleet
<a name="create-crfleet"></a>

When you create a Capacity Reservation Fleet it automatically creates Capacity Reservations for the instance types specified in the Fleet request, up to the specified total target capacity. The number of instances for which the Capacity Reservation Fleet reserves capacity depends on the total target capacity and instance type weights that you specify in the request. For more information, see [Instance type weight](crfleet-concepts.md#instance-weight) and [Total target capacity](crfleet-concepts.md#target-capacity).

When you create the Fleet, you must specify the instance types to use and a priority for each of those instance types. For more information, see [Allocation strategy](crfleet-concepts.md#allocation-strategy) and [Instance type priority](crfleet-concepts.md#instance-priority).

**Note**  
The **AWSServiceRoleForEC2CapacityReservationFleet** service-linked role is automatically created in your account the first time that you create a Capacity Reservation Fleet. For more information, see [Using service-linked roles for Capacity Reservation FleetUsing service-linked roles for EC2 Capacity Manager](using-service-linked-roles.md).

Currently, Capacity Reservation Fleets support the `open` instance matching criteria only.

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#### [ AWS CLI ]

**To create a Capacity Reservation Fleet**  
Use the [create-capacity-reservation-fleet](https://docs.aws.amazon.com/cli/latest/reference/ec2/create-capacity-reservation-fleet.html) command.

```
aws ec2 create-capacity-reservation-fleet \
    --total-target-capacity 24 \
    --allocation-strategy prioritized \
    --instance-match-criteria open \
    --tenancy default \
    --end-date 2021-12-31T23:59:59.000Z \
    --instance-type-specifications file://instanceTypeSpecification.json
```

The following are the contents of `instanceTypeSpecification.json`.

```
[
  {
    "InstanceType": "m5.xlarge",
    "InstancePlatform": "Linux/UNIX",
    "Weight": 3.0,
    "AvailabilityZone":"us-east-1a",
    "EbsOptimized": true,
    "Priority" : 1
  }
]
```

The following is example output.

```
{
    "Status": "submitted", 
    "TotalFulfilledCapacity": 0.0, 
    "CapacityReservationFleetId": "crf-abcdef01234567890", 
    "TotalTargetCapacity": 24
}
```

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#### [ PowerShell ]

**To create a Capacity Reservation Fleet**  
Use the [New-EC2CapacityReservationFleet](https://docs.aws.amazon.com/powershell/latest/reference/items/New-EC2CapacityReservationFleet.html) cmdlet.

```
New-EC2CapacityReservationFleet `
    -TotalTargetCapacity 24 `
    -AllocationStrategy "prioritized" `
    -InstanceMatchCriterion "open" `
    -Tenancy "default" `
    -EndDate 2021-12-31T23:59:59.000Z `
    -InstanceTypeSpecification $specification
```

The specification is defined as follows.

```
$specification = New-Object Amazon.EC2.Model.ReservationFleetInstanceSpecification
$specification.InstanceType = "m5.xlarge"
$specification.InstancePlatform = "Linux/UNIX"
$specification.Weight = 3.0
$specification.AvailabilityZone = "us-east-1a"
$specification.EbsOptimized = $true
$specification.Priority = 1
```

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