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 am running this on CentOS. I forked the original to add support for my Brother MFC-7840w printer, and use the latest Ubuntu base.

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

Example run command:

docker run --name cups -p 631:631   --restart unless-stopped  \
  -v <your services dir>:/services \
  -v <your config dir>:/config \
  -v /var/run/dbus:/var/run/dbus \
  -e CUPSADMIN="<username>" \
  -e CUPSPASSWORD="<password>" \
  chuckcharlie/cups-airprint-brother:latest

Add and set up printer:

CUPS will be configurable at http://[diskstation]:631 using the CUPSADMIN/CUPSPASSWORD.

Install avahi on local host:

yum install avahi
systemctl start avahi-daemon
systemctl enable avahi-daemon

This was the only way I was able to get /var/run/dbus to respond correctly in the container.

Notes

I had to run the airprint-generate.py script on the local host to get the avahi service file to generate. python airprint-generate.py -H localhost -p 631 -u admin -d <your services dir>