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Free tier does have some restrictions, and some options when you launch an instance have extra charges. Most likely is that you left the default "Unlimited" setting on, which does say underneath "Additional charges may apply". This means that once CPU credits are exhausted your instance won't be throttled, it will continue to run at full speed and incur extra charges above the hourly instance price.
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One can end up with massive charges at the end of the month if one is not careful
已回答 9 个月前
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This is exactly right, T3 unlimited instances can exceed the CPU credits and free tier eligibility. I would recommend setting up some monitoring on your spend to keep track of the usage that way. It will help notify you if it goes over a threshold for the month. https://aws.amazon.com/aws-cost-management/aws-budgets/
In addition to what @Rob_H said above, AWS Budgets also has an option to stop the instance if it goes over budget or is forecasted to go over budget. https://aws.amazon.com/blogs/aws-cloud-financial-management/get-started-with-aws-budgets-actions/