docker-compose: redis connection refused between containers
In your code localhost from rq-worker1 is rq-worker1 itself, not redis and you can't reach redis:6379 by connect to localhost from rq-worker1. But by default redis and rq-worker1 are in the same network and you can use service name as a domain name in that network.It means, that you can connect to redis service from rq-worker1 using redis as a domain name, for instance: client.connect(("redis", 6379))
You should replace localhost with redis in config of rq-worker1.