[ansible][aio][bobcat] How to contract on AWS EC2 instance (Only one instance)

Hi

I try to contract using openstack-ansible aio on AWS EC2 instance (only one node). refer to construction steps: https://docs.openstack.org/openstack-ansible/latest/user/aio/quickstart.html

but it will occurred some problems with below, i can't proceed on this way. https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack....

My purpose is what it checks any functions(version = 28.0.1 or 27.0.1). anyone tell me an easy way to build on a single instance on AWS EC2? Or is there a procedure to build on several instances without VLANs? EC2 does not allow VLANs. Could you support / share any information?

Thanks regards.