Well, they've been created from the same filesystem snapshot or something else. The system UUID is a one-time generated file on disk (literally named .uuid) in the data directory under the install location. It's deliberately omitted from Ignition's gateway backup files. Since you used some filesystem/vm/etc backup to create your duplicate gateways, you'll have to reach into the filesystem on each copy, delete that file, and restart the gateway. That will regenerate the file with a new, unique UUID.
3 Likes