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04.09-placement-group.md

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Placement Groups

https://github.com/awsdocs/amazon-ec2-user-guide/blob/master/doc_source/placement-groups.md

You can launch or start instances in a placement group, which determines how instances are placed on underlying hardware. When you create a placement group, you specify one of the following strategies for the group:

  • Cluster – clusters instances into a low-latency group in a single Availability Zone
  • Partition – spreads instances across logical partitions, ensuring that instances in one partition do not share underlying hardware with instances in other partitions
  • Spread – spreads instances across underlying hardware

There is no charge for creating a placement group.

Examp Tips:

  • A clustered placement group can't span multiple AZ.
  • A spread placement group can.
  • The name must be unique within your AWS account.
  • Only certain types of instances can be launched in a placement group (Compute Optimized, GPU, Memory Optimized, Storage Optimized).
  • AWS recommend homogenous instances within placement groups.
  • You can't merge placement groups.
  • You can't move an existing instances into a placement group. You can create an AMI from your existing instance, and then launch a new instance from the AMI into a placement group.