Posted On: Aug 24, 2020

We’ve introduced the following 5 fields to the instance metadata service: region, placement group name, partition number, host ID, and availability zone-ID. You can use these fields after launch or while your instance is running to understand your instance location. This is useful for populating the region for your Amazon Web Services environment. Additionally, these fields help you identify your instance placement information within an availability zone. If you are running a spread workload such as a distributed database, you can use this information to spread your instances across an availability zone. 

These instance metadata fields are now available in Amazon Web Services China (Beijing) region, operated by Sinnet and Amazon Web Services China (Ningxia) region, operated by NWCD 

To learn more about these fields, see the user guide

To learn more about partition placement groups, see the user guide for EC2 Partition Placement Groups.