Redis Docker connection refused

You need to provide more information about your environment (OS, Docker installation, etc), but basically, if you start your Redis container like this:

docker run --name=redis-devel --publish=6379:6379 --hostname=redis --restart=on-failure --detach redis:latest

It should expose the port no matter what. The only reason you might not be able to connect to it, is if you've messed up your bridge interface, if you're on Linux, or you're using a docker machine with its own network interface and IP address and you're not connecting to that IP address. If you're using Docker for Mac, then that only supports routing to the localhost address, since bridging on Mac hosts doesn't work yet.

Anyway, on MacOS with Docker for Mac (not the old Docker Toolbox), the following should be enough to get your started:

➜  ~ docker run --name=redis-devel --publish=6379:6379 --hostname=redis --restart=on-failure --detach redis:latest
6bfc6250cc505f82b56a405c44791f193ec5b53469f1625b289ef8a5d7d3b61e
➜  ~ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
6bfc6250cc50        redis:latest        "docker-entrypoint.s…"   10 minutes ago      Up 10 minutes       0.0.0.0:6379->6379/tcp   redis-devel
➜  ~ redis-cli ping
PONG
➜  ~ 

If you're using the Redis 6.2 configuration example as a starting place (like I was when I encountered this issue), the combination of the bind 127.0.0.1 directive and protected-mode yes was not allowing for communication between Docker containers. For my purposes I commented out the bind directive and set the protected-mode directive to no -- but heed the provided warnings about not exposing Redis to the open internet.

Find the discovered port of the redis and use that to connect

docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' redis-server