AWS-CLI to confirm checksums when uploading files to S3

Question

Uploading data to S3 using the aws-cli does aws-cli do any work to confirm that the resulting file in S3 matches the original file, or do I somehow need to manage that myself?

It matters to me because I'm intending to upload GPG-encrypted files from a backup process, and I'd like some confidence that what's been stored in S3 actually matches the original.

Answer 1

These are the Key points for uploads i found from AWS Documentation:

• The AWS CLI calculates the Content-MD5 header for both standard and multipart uploads.
• If the checksum that S3 calculates does not match the Content-MD5 provided, S3 will not store the object and instead will return an error message back the AWS CLI.
• The AWS CLI will retry this error up to 5 times before giving up and exiting with a nonzero exit code.