Placement groups for EC2 instances in AWS PCS - AWS PCS

Placement groups for EC2 instances in AWS PCS

You can use a placement group to influence the placement of EC2 instances to suit the needs of the workload that runs on them.

Placement group types

  • Cluster – Packs instances close together in an Availability Zone to optimize for low-latency communication.

  • Partition – Spreads instances across logical partitions to help maximize resilience.

  • Spread – Strictly enforces that a small number of instances launch on distinct hardware, which can also help with resiliency.

For more information, see Placement groups for your Amazon EC2 instances in the Amazon Elastic Compute Cloud User Guide.

We recommended you include a cluster placement group when you configure an AWS PCS compute node group to use Elastic Fabric Adapter (EFA).

To create a cluster placement group that works with EFA

  1. Create a placement group with the type cluster for the compute node group.

    • Use the following AWS CLI command:

      aws ec2 create-placement-group --strategy cluster --group-name PLACEMENT-GROUP-NAME

    • You can also use a CloudFormation template to create a placement group. For more information, see Working with CloudFormation templates in the AWS CloudFormation User Guide. Download the template from the following URL and upload it into the CloudFormation console.

      https://aws-hpc-recipes.s3.amazonaws.com/main/recipes/pcs/enable_efa/assets/efa-placement-group.yaml

  2. Include the placement group in the EC2 launch template for the AWS PCS compute node group.