Now that is remarkable. The overlay subdir has a supposedly random unique number. Me and my colleagues get exactly the same as a SHA256 hash for a duplicate blob when trying to push an image to quay.io : Getting image source signatures Error: trying to reuse blob sha256:476579af086aee78cb12d88b08fd6b61a80a3f055cae293ec2d15a37dbe7b3f9 at destination: Requesting bearer token: invalid status code from registry 400 (Bad Request) This must be something deep in how container images are handled. I wonder what data generates this specific hash; maybe an empty data set? -- Anton Peters