{section: usage} -In this prototype, the =condor_annex= tool requires a JSON file describing the kind of instances you'd like. The easiest way to generate this JSON file is using the AWS web console; when you request a Spot Fleet, on the last page before you submit the request, there's a button in the upper-right labelled "JSON config"; click it to download a file. Save the file (the default name is =config.json=, which is fine). FIXME: If you're not familiar with Spot Fleet, the prototype includes a reasonable example configuration (=example.json=) you can use to get started. It uses an image maintained by HTCondor (Amazon Linux with HTCondor pre-installed). +In this prototype, the =condor_annex= tool requires a JSON file describing the kind of instances you'd like. The easiest way to generate this JSON file is using the AWS web console; when you request a Spot Fleet, on the last page before you submit the request, there's a button in the upper-right labelled "JSON config"; click it to download a file. Save the file (the default name is =config.json=, which is fine). After you save the config, open it in your favorite text editor and remove the two lines containing "ValidFrom" and "ValidUntil". (FIXME: If =condor_annex= were to just ignore these entries, would it need to support additional CLI flags to set them?)