Host-local networks in Docker Compose - networking

Question

I have the following docker-compose.yml, but need to model a public/private network split where the Redis instance must only be accessible to localhost.
version: "2.2" # for compatibility, I can upgrade if needed
services:
nginx:
image: nginx
ports:
- 8080:80
redis:
image: redis
ports:
- 6379:6379
This seems straightforward if I needed to restrict it to being accessible only within the docker network. Consider:
version: "2.2"
services:
nginx:
image: nginx
ports:
- 8080:80
networks:
- frontend
- backend
redis:
image: redis
ports:
- 6379:6379
networks:
- backend
networks:
frontend: {}
backend:
internal: true
However our local web developers need to be able to access that Redis instance from their host machine (outside of the docker network) when they build, run, and debug locally.

Answer 1

Just bind the service port of redis to localhost(127.0.0.1).
Try follows...
...
redis:
image: redis
ports:
- 127.0.0.1:6379:6379
...

Answer 2

Run Redis Web UI called redis-commander.
Use env vars to point to the running redis.
Expose this new container & access it instead of exposing Redis container.
services:
redis:
# Do comment ports! no need to expose it
# ports:
# - 6379:6379
// ....
redis-commander:
image: rediscommander/redis-commander:latest
restart: unless-stopped
environment:
REDIS_HOST: redis:6379 # <-- 🔴 Here you point to your redis
# REDIS_PASSWORD # <- in case redis is protected with password
ports:
- "8081:8081"
Let your developers go to http://localhost:8081 and enjoy.
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