How do I change the port 80 to 8085 for pihole?
I want to install pivccu3 and need port 80 for the ccu3 if I understand correctly.
You mean for the web interface? You would need to change the listening port of your web server. What web server do you use?
I had dietpi install pihole.
How do I see which web server I have?
you can check your installed software with dietpi-software.
So you are using apache.
See this github issue for how to change the port:
https://github.com/MichaIng/DietPi/issues/4880#issuecomment-948677692