问题
In AWS free tier account providing 30GB storage to create an instance, if creating another instance with the same account is it chargeable?
回答1:
There is no such thing as a free AWS account. However, there is a free usage tier that provides a certain amount of select services at no charge, typically for the first 12 months of the account.
The free usage tier does include 30GB of EBS storage. This means that the first 30GB of EBS storage for an entire month is free every month. This could be used as 60GB for half a month, 120GB for a quarter of a month or 30GB for the whole month. This logic applies to all services -- AWS services are typically calculated on an hourly basis, so the hours can be used in parallel if desired.
In fact, a recent change means that EBS is now charged per-second, so if you delete the volumes when they are not necessary, you will even gain the benefit of part-hours.
Mind you, some of the costs are quite low even if you exceed the free usage tier. In US regions, the cost is $0.10/GB/month, so an extra 30GB volume for the month would cost $3.00.
来源：https://stackoverflow.com/questions/46693756/aws-free-tier-account-providing-30gb-storage-to-create-an-instance