You currently have 2 instances (c4.large) in a VPC.
You plan to create a placement group because now there is a requirement for better network communication between the instances.
You are planning to move the already created instances to this placement group.
But you encounter an issue.
Which of the below could be a legitimate issue?
Click on the arrows to vote for the correct answer
A. B. C. D.Answer - C.
The AWS documentation mentions the following.
You can't move an existing instance 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.
For more information on placement groups, one can visit the below URL:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.htmlNote: This question is marked for replacement.
Now with lastest AWS update you can move existing instance to a Placement Group.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#change-instance-placement-groupThe correct answer is A. The instance type of the instances is not supported in the placement group.
Explanation: A placement group is a logical grouping of instances within a single Availability Zone. It enables applications to achieve the low-latency network performance necessary for tightly-coupled node-to-node communication that is typical of HPC (High-Performance Computing) workloads.
When you create a placement group, you must choose the instance type of the instances that will be part of the placement group. Not all instance types are supported in a placement group. For example, some instance families, such as T2 and T3, are not supported in placement groups. If you try to move an instance that is not supported in a placement group to a placement group, you will encounter an error.
The other options are incorrect:
B. You can have Linux instances in a placement group. There is no restriction on the operating system used by the instances in a placement group.
C. You can move an existing instance to a placement group. However, there are some restrictions on moving instances to a placement group. For example, you cannot move an instance from a placement group to a standalone instance, and vice versa. Also, you cannot move an instance to a placement group if it is already in a different placement group.
D. You can have instances with EBS volumes in a placement group. There is no restriction on the type of storage used by the instances in a placement group.