support muliti port redis in docker-compose

docker build -f dockerfile -t multi-port-redis .

docker run -d --cap-add=NET_ADMIN -e TO_REDIRECT_PORT=7999 -e REDIS_PORT=6379 -p "6379:6379" -p "7999:7999" multi-port-redis

docker-compose -f docker-compose.yml up -d

nc -v -w 2 127.0.0.1 6379

nc -v -w 2 127.0.0.1 7999

1. why not set "7999:6379" in "ports" config ?
   Only set "7999:6379" in "ports" config will only work out of docker-compose network. Can't work in docker-compose network