How to start redis-server on a different port than the default port 6379 in ubuntu

Question

How to start redis-server on a different port than the default port 6379 in Ubuntu? I have used the following steps to install the redis:

Answer 1

redis-server --port 6380 will start a Redis server listening to port 6380.

redis-cli -p 6380 -- a suggestion made here as well -- does not start a Redis server listening to port 6380, but tries to connect the CLI to a (hopefully running) Redis server that listens to that port.