Modify the auto-placement setting of a Dedicated Host. When auto-placement is enabled,
any instances that you launch with a tenancy of
host but without a specific
host ID are placed onto any available Dedicated Host in your account that has
auto-placement enabled. When auto-placement is disabled, you need to provide a host ID
to have the instance launch onto a specific host. If no host ID is provided, the
instance is launched onto a suitable host with auto-placement enabled.
You can also use this API action to modify a Dedicated Host to support either multiple instance types in an instance family, or to support a specific instance type only.