Modify the auto-placement setting of a Dedicated Host.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/ec2/modify-hosts.html
aws ec2 modify-hosts --auto-placement on --host-ids h-012a3456b7890cdef |
| Changing the Hostname of Your Linux Instance - Amazon Elastic Compute Cloud : http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/how-dedicated-hosts-work.html |