docker-compose.yml

version: '3'

services:
  redis:
    image: redis:6.2.0-alpine
    volumes:
      - ./redis-config:/usr/local/etc/redis
    ports:
      - "12345:6379"
    command: redis-server /usr/local/etc/redis/redis.conf
networks: 
  default: 
    external: 
      name: external-example