I'm digging into my AWS bills and can't understand why my costs are so high. I've set up an S3 distribution behind CloudFront, which has a pretty solid cache hit ratio of 93%. My transfer out from CloudFront is around 110GB per month, and I handle roughly 4 million requests. When I check my Cost Explorer, it's showing that I'm spending about $160 monthly on Data Transfer Out, specifically filtered by the S3 service. I've found out that nearly all of this cost (99%) is tied to that S3 distribution. I thought that transfer between S3 and CloudFront was free, so I'm puzzled as to why I'm being charged. Can anyone help me understand what I might be missing here?
3 Answers
You might want to check your full itemized bill. It can provide a detailed breakdown of costs by region and service. When you look closely, you might see additional charges rather than just being stuck on 'S3'. For instance, this could reveal charges that aren't immediately obvious, like request fees or data processing costs.
Have you activated the CloudTrail service? It can help track what operations are happening on your S3 bucket and CloudFront setup. Also, check your class files stored in your S3 bucket; sometimes unnecessary access or transfers can rack up costs.
I understand your frustration! It's a good idea to reach out to AWS's Account & Billing team; they can help clarify your charges. While waiting for responses, you can look into their documentation on unexpected charges—it might give you some insights into unusual costs.
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