Replacing local redis server with a new redis server in redis-brain

I'm currently trying to build a slack bot using Hubot and I need to persist some things on Redis. I'm using the following script from https://github.com/hubotio/hubot-redis-brain

'use strict'

// Description:
//   Persist hubot's brain to redis
//
// Configuration:
//   REDISTOGO_URL or REDISCLOUD_URL or BOXEN_REDIS_URL or REDIS_URL.
//     URL format: redis://<host>:<port>[/<brain_prefix>]
//     URL format (UNIX socket): redis://<socketpath>[?<brain_prefix>]
//     If not provided, '<brain_prefix>' will default to 'hubot'.
//   REDIS_NO_CHECK - set this to avoid ready check (for exampel when using Twemproxy)
//
// Commands:
//   None

const Url = require('url')
const Redis = require('redis')

module.exports = function (robot) {
  let client, prefix
  const redisUrlEnv = getRedisEnv()
  const redisUrl = process.env[redisUrlEnv] || 'redis://localhost:6379'

  if (redisUrlEnv) {
    robot.logger.info(`hubot-redis-brain: Discovered redis from ${redisUrlEnv} environment variable`)
  } else {
    robot.logger.info('hubot-redis-brain: Using default redis on localhost:6379')
  }

  if (process.env.REDIS_NO_CHECK) {
    robot.logger.info('Turning off redis ready checks')
  }

  const info = Url.parse(redisUrl)

  if (info.hostname === '') {
    client = Redis.createClient(info.pathname)
    prefix = (info.query ? info.query.toString() : undefined) || 'hubot'
  } else {
    client = (info.auth || process.env.REDIS_NO_CHECK)
              ? Redis.createClient(info.port, info.hostname, {no_ready_check: true})
            : Redis.createClient(info.port, info.hostname)
    prefix = (info.path ? info.path.replace('/', '') : undefined) || 'hubot'
  }

  robot.brain.setAutoSave(false)

  const getData = () =>
    client.get(`${prefix}:storage`, function (err, reply) {
      if (err) {
        throw err
      } else if (reply) {
        robot.logger.info(`hubot-redis-brain: Data for ${prefix} brain retrieved from Redis`)
        robot.brain.mergeData(JSON.parse(reply.toString()))
        robot.brain.emit('connected')
      } else {
        robot.logger.info(`hubot-redis-brain: Initializing new data for ${prefix} brain`)
        robot.brain.mergeData({})
        robot.brain.emit('connected')
      }

      robot.brain.setAutoSave(true)
    })

  if (info.auth) {
    client.auth(info.auth.split(':')[1], function (err) {
      if (err) {
        return robot.logger.error('hubot-redis-brain: Failed to authenticate to Redis')
      }

      robot.logger.info('hubot-redis-brain: Successfully authenticated to Redis')
      getData()
    })
  }

  client.on('error', function (err) {
    if (/ECONNREFUSED/.test(err.message)) {

    } else {
      robot.logger.error(err.stack)
    }
  })

  client.on('connect', function () {
    robot.logger.debug('hubot-redis-brain: Successfully connected to Redis')
    if (!info.auth) { getData() }
  })

  robot.brain.on('save', (data) => {
    if (!data) {
      data = {}
    }
    client.set(`${prefix}:storage`, JSON.stringify(data))
  })

  robot.brain.on('close', () => client.quit())
}

function getRedisEnv () {
  if (process.env.REDISTOGO_URL) {
    return 'REDISTOGO_URL'
  }

  if (process.env.REDISCLOUD_URL) {
    return 'REDISCLOUD_URL'
  }

  if (process.env.BOXEN_REDIS_URL) {
    return 'BOXEN_REDIS_URL'
  }

  if (process.env.REDIS_URL) {
    return 'REDIS_URL'
  }
}

My problem is that I don't know which part of the code I should change so that the script uses my Redis server and not the local Redis server. Also, my Redis server has a password as part of the url and I'm wondering where to put that as well. Thank you.

Seems like you can have no code changes but set the environment variable REDIS_URL to the URL for your Redis instance.