How to connect to specific redis

[Ezra Tsai]

If i want to connect cube.js to my own built redis, what should I do.
I use CUBEJS_REDIS_URL which is claimed by official document. So, for example, if my own redis port is 31.71.195.218.
Should I use write CUBEJS_REDIS_URL=redis://31.71.195.218:6379/0 in my backend .env file? I use many combination like, redis://31.71.195.218:6379, redis://31.71.195.218, ect. However, they all shows

process in uncaughtException:  { Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1117:14)
  errno: 'ECONNREFUSED',
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 6379 }

in my terminal. It seems that this environment variable CUBEJS_REDIS_URL doesn't useful.

Any help/clarifications would be helpful; thanks.

[Ezra Tsai]

I post in the wrong place. sorry.