I've installed cups 2.2.7 as a Docker app on my unraid server and had to do some work to get it to start. It now works great, sort-of, enabling access to my networked but not airprint-enabled printers from my Android and my wife's iOS phone . . . until the unraid server reboots. I'm sure that the docker is storing the printer config information somewhere that's not persistent across reboots, but I have no idea how to fix this.
Can anyone help? I know that I'm missing some technical knowledge that would enable me to fix this.