(aws-eks): Support bottlerocket arm64 AMI's

[gfina]

We currently only use x86_64 for bottlerocket AMI's even though sometimes arm64 is needed (for graviton instance types for example).

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Originaly reported as

EKS: using add_auto_scaling_group_capacity fails OS BOTTLEROCKET and Graviton Instance type

description of the bug:

EKS: using add_auto_scaling_group_capacity fails with machine_image_type=eks.MachineImageType.BOTTLEROCKET and Graviton Instance type

    cluster.add_auto_scaling_group_capacity(id='BottlerocketNodes', instance_type=ec2.InstanceType('t4g.large'),
                                            machine_image_type=eks.MachineImageType.BOTTLEROCKET,
                                              min_capacity=2.0)

Reproduction Steps

setup an EKS cluster with CDK and then add to it an addition capacity, with BOTTLEROCKET and graviton instance using this:

   cluster.add_auto_scaling_group_capacity(id='BottlerocketNodes', instance_type=ec2.InstanceType('t4g.large'),
                                                machine_image_type=eks.MachineImageType.BOTTLEROCKET,
                                                  min_capacity=2.0)

cdk --version
1.101.0 (build 149f0fc)

The Autoscaling throws and error:
Launching a new EC2 instance. Status Reason: The architecture 'arm64' of the specified instance type does not match the architecture 'x86_64' of the specified AMI. Specify an instance type and an AMI that have matching architectures, and try again. You can use 'describe-instance-types' or 'describe-images' to discover the architecture of the instance type or AMI. Launching EC2 instance failed

What did you expect to happen?

I would expect an AutoScaling group to be created with 2 instances on t4g.large.

What actually happened?

Launching a new EC2 instance. Status Reason: The architecture 'arm64' of the specified instance type does not match the architecture 'x86_64' of the specified AMI. Specify an instance type and an AMI that have matching architectures, and try again. You can use 'describe-instance-types' or 'describe-images' to discover the architecture of the instance type or AMI. Launching EC2 instance failed

Environment

• **CDK CLI Version : ** 1.101.0 (build 149f0fc)
• Framework Version:
• Node.js Version: v12.10.0
• OS : Mac OS Big Sur 10.2.3
• Language (Version): Python 3.8.7 (v3.8.7:6503f05dd5, Dec 21 2020, 12:45:15)

Other

This code swapping out the instance works as expected:

        cluster.add_auto_scaling_group_capacity(id='BottlerocketNodes', instance_type=ec2.InstanceType('t3.xlarge'),
                                                machine_image_type=eks.MachineImageType.BOTTLEROCKET,
                                                  min_capacity=2.0)

So it appears that CDK is not making the correct AMI decision with Bottlerocket and ARM instance types. However is for intel instance types.

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This is 🐛 Bug Report

[iliapolo]

Looks like we are always assuming x86_64 for bottlerocket.

aws-cdk/packages/@aws-cdk/aws-eks/lib/private/bottlerocket.ts

Line 30 in 527f662

this.amiParameterName = `/aws/service/bottlerocket/aws-k8s-${this.kubernetesVersion}/x86_64/latest/image_id`;

@pahud You have some insight on this? Can we use arm64 in the SSM parameter type when needed?

[rmsy]

Just wanted to ask about the same thing, but for the ECS variant of the image:

aws-cdk/packages/@aws-cdk/aws-ecs/lib/cluster.ts

Line 788 in d94e4c1

this.amiParameterName = `/aws/service/bottlerocket/${this.variant}/x86_64/latest/image_id`;

An AMI does exist for aws-ecs-1/arm64. If this is something straightforward to submit a PR for, I would be willing to give it a shot.

[pahud]

Looks like we are always assuming x86_64 for bottlerocket.

aws-cdk/packages/@aws-cdk/aws-eks/lib/private/bottlerocket.ts

Line 30 in 527f662

this.amiParameterName = `/aws/service/bottlerocket/aws-k8s-${this.kubernetesVersion}/x86_64/latest/image_id`;

@pahud You have some insight on this? Can we use arm64 in the SSM parameter type when needed?

According to the bottlerocket github repo, we do have arm64 support now.
https://github.com/bottlerocket-os/bottlerocket#architectures

aws ssm get-parameters --names /aws/service/bottlerocket/aws-k8s-1.20/arm64/latest/image_id
{
    "Parameters": [
        {
            "Name": "/aws/service/bottlerocket/aws-k8s-1.20/arm64/latest/image_id",
            "Type": "String",
            "Value": "ami-0212d00ded9cb67f4",
            "Version": 2,
            "LastModifiedDate": "2021-05-20T01:14:42.129000+08:00",
            "ARN": "arn:aws:ssm:ap-northeast-1::parameter/aws/service/bottlerocket/aws-k8s-1.20/arm64/latest/image_id",
            "DataType": "text"
        }
    ],
    "InvalidParameters": []
}

I support the PR for it.

[iliapolo]

@pahud Thanks. Converting this to a feature request. Happy to accept a contribution here.

[github-actions]

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