Error failed to fetch an image or build from source: error connecting to docker: failed building options: Validation failed: Name has already been taken

[greg]

As far as I know this is an ongoing issue that nobody has yet pinned down the cause of.

It seems like it may be connected to using a remote builder so if your CI service has Docker available, you could use that instead to see if that resolves it. Else a slightly awkward fix is deleting the remote builder. But that’s less than ideal e.g

Flaky deployment fails

Every X deployments or so, the remote deployment (--remote-only) fails with the following error: Error failed to fetch an image or build from source: error connecting to docker: failed building options: Validation failed: Name has already been taken Deleting the remote worker VM and forcing Fly to create a new one solves this problem, but this behavior impairs a smooth CI/CD workflow. We are in fra region.