I signed up for Amazon AWS's Free Tier instance. Everything works fine so far, but I'm a bit confused about how to make sure I won't have to pay for it.
Specifically, I've been billed a bit for "Elastic IP address not attached to a running instance per hour on a pro rata basis".
In the Management Console > Elastic IPs section, I have allocated a new Elastic IP and attached it to my instance. It seems that I can allocate 4 more addresses, but not attach them, this is only possible for one instance. How do I avoid being billed for unattached Elastic IPs? Is there even a way, if I have 5 Elastic IPs assigned to my account, but only have one instance?
I'm also not sure how the traffic usage reports work - I think I'm allowed "*15 GB of bandwidth out aggregated across all AWS services", but only if I use the Public DNS and not the Elastic IP. Is this correct?