Cluster management with custom AMIs - Amazon SageMaker AI
Permissions required for cluster operationsCreate a clusterUpdate the cluster softwareScale up an instance groupAdd an instance group

Cluster management with custom AMIs

After the custom AMI is built, you can use it for creating or updating an Amazon SageMaker HyperPod cluster. You can also scale up or add instance groups that use the new AMI.

Permissions required for cluster operations

Add the following permissions to the cluster admin user who operates and configures SageMaker HyperPod clusters. The following policy example includes the minimum set of permissions for cluster administrators to run the SageMaker HyperPod core APIs and manage SageMaker HyperPod clusters with custom AMI.

Note that AMI and AMI EBS snapshot sharing permissions are included through ModifyImageAttribute and ModifySnapshotAttribute API permissions as part of the following policy. For scoping down the sharing permissions, you can take the following steps:

  • Add tags to control the AMI sharing permissions to AMI and AMI snapshot. For example, you can tag the AMI with AllowSharing as true.

  • Add the context key in the policy to only allow AMI sharing for AMIs tagged with certain tags.

The following policy is a scoped down policy to ensure only AMIs tagged with AllowSharing as true are allowed.

JSON
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "iam:PassRole",
            "Resource": "arn:aws:iam::111122223333:role/your-execution-role-name"
        },
        {
            "Effect": "Allow",
            "Action": [
                "sagemaker:CreateCluster",
                "sagemaker:DeleteCluster",
                "sagemaker:DescribeCluster",
                "sagemaker:DescribeClusterNode",
                "sagemaker:ListClusterNodes",
                "sagemaker:ListClusters",
                "sagemaker:UpdateCluster",
                "sagemaker:UpdateClusterSoftware",
                "sagemaker:BatchDeleteClusterNodes",
                "eks:DescribeCluster",
                "eks:CreateAccessEntry",
                "eks:DescribeAccessEntry",
                "eks:DeleteAccessEntry",
                "eks:AssociateAccessPolicy",
                "iam:CreateServiceLinkedRole",
                "ec2:DescribeImages",
                "ec2:DescribeSnapshots"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:ModifyImageAttribute",
                "ec2:ModifySnapshotAttribute"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "ec2:ResourceTag/AllowSharing": "true"
                }
            }
        }
    ]
}
Important

If you plan to use an encrypted custom AMI, then make sure that your KMS key meets the permissions described in Customer managed AWS KMS key encryption for SageMaker HyperPod. Additionally, ensure that your custom AMI's KMS key is also used to encrypt your cluster's Amazon EBS root volume.

Create a cluster

You can specify your custom AMI in the ImageId field for the CreateCluster operation.

The following examples show how to create a cluster with a custom AMI, both with and without an AWS KMS customer managed key for encrypting the cluster volumes.

Standard example

The following example shows how to create a cluster with a custom AMI.

aws sagemaker create-cluster \
   --cluster-name <exampleClusterName> \
   --orchestrator 'Eks={ClusterArn='<eks_cluster_arn>'}' \
   --node-provisioning-mode Continuous \
   --instance-groups '{
   "InstanceGroupName": "<exampleGroupName>",
   "InstanceType": "ml.c5.2xlarge",
   "InstanceCount": 2,
   "LifeCycleConfig": {
      "SourceS3Uri": "<s3://amzn-s3-demo-bucket>",
      "OnCreate": "on_create_noop.sh"
   },
   "ImageId": "<your_custom_ami>",
   "ExecutionRole": "<arn:aws:iam::444455556666:role/Admin>",
   "ThreadsPerCore": 1,
   "InstanceStorageConfigs": [
   
        {
            "EbsVolumeConfig": {
                "VolumeSizeInGB": 200
            }
        }
   ]
}' --vpc-config '{
   "SecurityGroupIds": ["<security_group>"],
   "Subnets": ["<subnet>"]
}'
Customer managed key example

The following example shows how to create a cluster with a custom AMI while specifying your own AWS KMS customer managed key for encrypting the cluster's Amazon EBS volumes. It is possible to specify different customer managed keys for the root volume and the instance storage volume. If you don't use customer managed keys in the InstanceStorageConfigs field, then an AWS owned KMS key is used to encrypt the volumes. If you use different keys for the root volume and secondary instance storage volumes, then set the required KMS key policies on both of your keys.

aws sagemaker create-cluster \
   --cluster-name <exampleClusterName> \
   --orchestrator 'Eks={ClusterArn='<eks_cluster_arn>'}' \
   --node-provisioning-mode Continuous \
   --instance-groups '{
   "InstanceGroupName": "<exampleGroupName>",
   "InstanceType": "ml.c5.2xlarge",
   "InstanceCount": 2,
   "LifeCycleConfig": {
      "SourceS3Uri": "<s3://amzn-s3-demo-bucket>",
      "OnCreate": "on_create_noop.sh"
   },
   "ImageId": "<your_custom_ami>",
   "ExecutionRole": "<arn:aws:iam:us-east-1:444455556666:role/Admin>",
   "ThreadsPerCore": 1,
   "InstanceStorageConfigs": [
             # Root volume configuration
            {
                "EbsVolumeConfig": {
                    "RootVolume": True,
                    "VolumeKmsKeyId": "arn:aws:kms:us-east-1:111122223333:key/key-id"
                }
            },
            # Instance storage volume configuration
            {
                "EbsVolumeConfig": {
                    "VolumeSizeInGB": 100,
                    "VolumeKmsKeyId": "arn:aws:kms:us-east-1:111122223333:key/key-id"
                }
            }
   ]
}' --vpc-config '{
   "SecurityGroupIds": ["<security_group>"],
   "Subnets": ["<subnet>"]
}'

Update the cluster software

If you want to update an existing instance group on your cluster with your custom AMI, you can use the UpdateClusterSoftware operation and specify your custom AMI in the ImageId field. Note that unless you specify the name of a specific instance group in your request, then the new image is applied to all of the instance groups in your cluster.

The following example shows how to update a cluster's platform software with a custom AMI:

aws sagemaker update-cluster-software \
   --cluster-name <exampleClusterName> \
   --instance-groups <instanceGroupToUpdate> \
   --image-id <customAmiId>

Scale up an instance group

The following examples show how to scale up an instance group for a cluster using a custom AMI, both with and without using an AWS KMS customer managed key for encryption.

Standard example

The following example shows how to scale up an instance group with a custom AMI.

aws sagemaker update-cluster \
    --cluster-name <exampleClusterName> --instance-groups '[{                  
    "InstanceGroupName": "<exampleGroupName>",
   "InstanceType": "ml.c5.2xlarge",
   "InstanceCount": 2,
   "LifeCycleConfig": {
      "SourceS3Uri": "<s3://amzn-s3-demo-bucket>",
      "OnCreate": "on_create_noop.sh"
   },
   "ExecutionRole": "<arn:aws:iam::444455556666:role/Admin>",
   "ThreadsPerCore": 1,
   "ImageId": "<your_custom_ami>"
}]'
Customer managed key example

The following example shows how to update and scale up your cluster with a custom AMI while specifying your own AWS KMS customer managed key for encrypting the cluster's Amazon EBS volumes. It is possible to specify different customer managed keys for the root volume and the instance storage volume. If you don't use customer managed keys in the InstanceStorageConfigs field, then an AWS owned KMS key is used to encrypt the volumes. If you use different keys for the root volume and secondary instance storage volumes, then set the required KMS key policies on both of your keys.

aws sagemaker update-cluster \
    --cluster-name <exampleClusterName> --instance-groups '[{                  
    "InstanceGroupName": "<exampleGroupName>",
   "InstanceType": "ml.c5.2xlarge",
   "InstanceCount": 2,
   "LifeCycleConfig": {
      "SourceS3Uri": "<s3://amzn-s3-demo-bucket>",
      "OnCreate": "on_create_noop.sh"
   },
   "ExecutionRole": "<arn:aws:iam::444455556666:role/Admin>",
   "ThreadsPerCore": 1,
   "ImageId": "<your_custom_ami>",
   "InstanceStorageConfigs": [
             # Root volume configuration
            {
                "EbsVolumeConfig": {
                    "RootVolume": True,
                    "VolumeKmsKeyId": "arn:aws:kms:us-east-1:111122223333:key/key-id"
                }
            },
            # Instance storage volume configuration
            {
                "EbsVolumeConfig": {
                    "VolumeSizeInGB": 100,
                    "VolumeKmsKeyId": "arn:aws:kms:us-east-1:111122223333:key/key-id"
                }
            }
   ]
}]'

Add an instance group

The following example shows how to add an instance group to a cluster using a custom AMI:

aws sagemaker update-cluster \
   --cluster-name "<exampleClusterName>" \
   --instance-groups '{
   "InstanceGroupName": "<exampleGroupName>",
   "InstanceType": "ml.c5.2xlarge",
   "InstanceCount": 2,
   "LifeCycleConfig": {
      "SourceS3Uri": "<s3://amzn-s3-demo-bucket>",
      "OnCreate": "on_create_noop.sh"
   },
   "ExecutionRole": "<arn:aws:iam::444455556666:role/Admin>",
   "ThreadsPerCore": 1,
   "ImageId": "<your_custom_ami>"
}' '{
   "InstanceGroupName": "<exampleGroupName2>",
   "InstanceType": "ml.c5.2xlarge",
   "InstanceCount": 1,
   "LifeCycleConfig": {
      "SourceS3Uri": "<s3://amzn-s3-demo-bucket>",
      "OnCreate": "on_create_noop.sh"
   },
   "ExecutionRole": "<arn:aws:iam::444455556666:role/Admin>",
   "ThreadsPerCore": 1,
   "ImageId": "<your_custom_ami>"
}'