aws s3 replace file atomically

Question

Environment

• I copied a file, ./barname.bin, to s3, using the command aws s3 cp ./barname.bin s3://fooname/barname.bin

• I have a different file, ./barname.1.bin that I want to upload in place of that file

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How can I upload and replace (overwrite) the file at s3://fooname/barname.bin with ./barname.1.bin?

Goals:

• Don't change the s3 url used to access the file (new file should also be available at s3://fooname/barname.bin).
• zero/minimum 'downtime'/unavailability of the s3 link.

Answer 1

Simply upload your new file on top of your old file to replace an old file in an S3 bucket. The existing file will be overwritten by your new file.

If your old file is located at s3:/fooname/barname.bin, you can replace it with a new one with the following command.

aws s3 cp ./barname.1.bin s3://fooname/barname.bin