bonjour-reflector VS docuum

Airprint uses Zeroconf/Bonjour, and this protocol is unrouted (i.e. only works on the local subnet), unfortunately it doesn’t work over different vlans. There’s a hack-ish way to get around it (“Bonjour reflection”, https://github.com/Gandem/bonjour-reflector ) you can try that.

Avahi is nifty for that however bonjour-reflector is on my list of things to play with for a little more fine-grained control over what people and devices are able to see on which network. For example, my guest wi-fi shouldn't be able to even see the chromecast in my bedroom. Even if firewall rules already prevent them from talking to it.

Find out more about the protocols in use. It might be mDNS/bonjour. At that point you can implement a reflector, for example bonjour-reflector https://github.com/Gandem/bonjour-reflector

You also will likely will have to enable Avahi, which at least on pfsense will echo everything between the interfaces it is enabled on. This isn't always desirable, there is some limited filtering possible in a more contemporary version of Avahi. bonjour-reflector is on my list of things to play with on a rainy day which should give me the granularity to expose one chromecast to my guest network and leave the rest locked up.

Or let docuum do the job for you, based on storage threshold. https://github.com/stepchowfun/docuum

Look into Docuum. https://github.com/stepchowfun/docuum You tell it how much disk space it's allowed, and it automatically prunes to that amount based on least used.

Since you're using docker, take a look at https://github.com/stepchowfun/docuum. You can set a threshold for how much disk space docker images are allowed to use and it will delete unused images if you exceed that threshold.