to set Redis password ,just put password value at .docker-compose/ directory as .redis_pass_file file, or use the sample:

cp .docker-compose/.redis_pass_file.local .docker-compose/.redis_pass_file 

Clients on the same machine, can join this service by define an external network, for example when the client network name is sample-network it should define as:

networks: sample-network: external: name: redis_redis-network 

The external network name, has two part, which are separated by an underline, redis is name of the repository, and redis-network is the network name of this repository