redis_cluster.js

//npm install ioredis
//npm install bluebird
//change endpoint to any two of your clusters

var Redis = require('ioredis');
var Promise = require('bluebird');
var cluster = new Redis.Cluster([{
  port: 30001,
  host: '127.0.0.1'
}, {
    port: 30008,
    host: '127.0.0.1'
  }]);



var counter = 0;

var set_value = Promise.coroutine(function *(){  
  while(true)
  {
    yield cluster.set("foo", counter++);
    console.log("set foo", counter);
    yield Promise.delay(1000);        
  };
})

set_value();

setInterval(function () {
  cluster.get('foo', function (err, res) {
    console.log("get foo:", err, res);
  });
},1000);