Experiencing InsufficientInstanceCapacity despite using Capacity Reservation

0

Hi folks,

I have a capacity reservation with 1 instance available for use:

$ aws ec2 describe-capacity-reservations --capacity-reservation-ids cr-00d78c6805551161a
{
    "CapacityReservations": [
        {
            "CapacityReservationId": "cr-00d78c6805551161a",
...
            "InstanceType": "c5n.9xlarge",
            "InstancePlatform": "Linux/UNIX",
            "AvailabilityZone": "us-east-1d",
...
            "AvailableInstanceCount": 1,
...
} 

I also have a stopped instance with matching instance type/platform/AZ assigned to this capacity:


$ aws ec2 describe-instances --instance-ids $myinstance
{
    "Reservations": [
        {
            "Groups": [],
            "Instances": [
                {
                    "AmiLaunchIndex": 0,
                    "ImageId": "ami-6ed35e06",
                    "InstanceId": "i-2d1ff5cc",
                    "InstanceType": "c5n.9xlarge",
....
 "Placement": {
                         "AvailabilityZone": "us-east-1d",
....
                    },
                    "CapacityReservationSpecification": {
                        "CapacityReservationTarget": {
                            "CapacityReservationId": "cr-00d78c6805551161a"
                        }
                    },
....
                  "PlatformDetails": "Linux/UNIX",
....
}

However I cannot start it:


$ aws ec2 start-instances --instance-ids $myinstance

An error occurred (InsufficientInstanceCapacity) when calling the StartInstances operation (reached max retries: 2): Insufficient capacity.

I must be confused as I would expect that the capacity reservation would be used.

Why does the instance fail to start?

I asked AWS support 2 days ago, but haven't made progress yet.

質問済み 2年前320ビュー
1回答
0

Attaching the document link that confirms the finding about Placement Groups and On-Demand Capacity Reservations:

Which says, Capacity Reservations can't be created in placement groups.


Thank you for confirming the response you received from the internal team. Through AWS Support cases, AWS engineers are able to check instance configurations at a much more granular level.

AWS
サポートエンジニア
回答済み 2年前

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