When I installed rapidMiner 10.1 with centOS 7.9, I ran into a problem

Hi!

Do you have another process listening on port 80 of that machine? What happens if you connect to http://machinename in a browser?

Regards,
Balázs

This was solved outside of the community, but as a quick summary for others with the same issue:

The linux kernel of centOS 7.9 is too old to support rootless docker
https://docs.rapidminer.com/latest/hub/install/docker-compose/#requirements