JanoMorano/docker-cups-airprint

This Ubuntu-based Docker image runs a CUPS instance that is meant as an AirPrint relay for printers that are already on the network but not AirPrint capable. I'm using it on a Synology NAS because the built in server doesn't work properly with my printers. The local Avahi will be utilized for advertising the printers on the network.

This is also an excuse to dip my toes into GitHub/Docker more, so why not? Hopefully someone else finds this useful.

Update: Clearly I haven't been maintaining this as I no longer use Synology for printing -- Recommend trying this fork instead: https://github.com/chuckcharlie/cups-avahi-airprint

Prereqs

• No other printers should be shared under Control Panel>External Devices>Printer so that the DSM's CUPS is not running.
• Enable Bonjour service discovery needs to be marked under Control Panel>Network>DSM Settings

Configuration

Volumes:

• /config: where the persistent printer configs will be stored
• /services: where the Avahi service files will be generated

Variables:

• CUPSADMIN: the CUPS admin user you want created
• CUPSPASSWORD: the password for the CUPS admin user

Ports:

• 631: the TCP port for CUPS must be exposed

Using

CUPS will be configurable at http://[diskstation]:631 using the CUPSADMIN/CUPSPASSWORD when you do something administrative.

If the /services volume isn't mapping to /etc/avahi/services then you will have to manually copy the .service files to that path at the command line.

Notes

• CUPS doesn't write out printers.conf immediately when making changes even though they're live in CUPS. Therefore it will take a few moments before the services files update
• Don't stop the container immediately if you intend to have a persistent configuration for this same reason