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Install the CUPS package
apk add cups
Make it autostart
Next time you reboot your Alpine Linux box, you would probably want cupsd to automatically start.
rc-update add cupsd
You can check your boot services:
lppasswd -a root
Configuring the cups server
Replace Listen localhost:631 with Listen *:631
Allow hosts in your subnet to connect by adding Allow localhost and Allow from subnet/mask in <Location /> section:
# Restrict access to the server... <Location /> Order allow,deny Allow localhost Allow from 192.168.0.0/24 </Location>