An EC2 instance in the Tokyo Region uploads data directly to an S3 bucket in the same Region.
For a preliminary estimate, identify the transfer direction between EC2 and S3.
Which statement is most appropriate for this path?
Some direct transfers between EC2 and S3 in the same Region have no data transfer charge. Charges for services in the path, such as a NAT Gateway, must be checked separately.
Detailed explanation
AWS has combinations of services for which direct transfer within the same Region has no data transfer charge. Direct EC2-to-S3 transfer is a common example.
AWS has combinations of services for which direct transfer within the same Region has no data transfer charge. Direct EC2-to-S3 transfer is a common example.
A NAT Gateway or another path service can add data processing charges even when the source and destination are in the same Region.
A NAT Gateway or another path service can add data processing charges even when the source and destination are in the same Region.
The service and path matter; direct EC2-to-S3 transfer in the same Region should not be treated as internet egress in every case.
The service and path matter; direct EC2-to-S3 transfer in the same Region should not be treated as internet egress in every case.
Reserved Instances are an EC2 pricing option and do not make all data transfer free.
Reserved Instances are an EC2 pricing option and do not make all data transfer free.
Check official documentation
Compare the following points with the official documentation.
AWSのデータ転送料金表で、同一リージョンのEC2とS3間の直接転送と、経路上のサービス料金を確認する。
Official references
What to confirm
同一リージョンという条件だけでなく、直接転送か途中サービス経由かを区別できる。
Key points
- Same-Region transfer
- Direct EC2-to-S3 transfer
- Path processing charges
Notes
- Environment:
- Data transfer pricing and free tiers can change by service and Region. Check the current AWS pricing page before implementation.
Foundation review
General rule and exception
Some direct same-Region service paths are free, but service-specific conditions and path charges still matter.
Transfer versus processing
A free transfer does not imply that a NAT Gateway or another intermediary is free.