Redis How to run / install Redis php?

I maybe had problem or maybe I don't know how to run redis
Is it centmin by default install redis, right?
so I don't need install redis by yum?

I can run :
php --ri redis
and output like this:
redis

Redis Support => enabled
Redis Version => 2.2.7

But I cant run
redis
or
service redis
#withoutput : redis: unrecognized service

• Server or VPS details ? XEN, KVM, OpenVZ, VMWare or dedicated server ? OS ? CentOS 6.7 or 7.2 ? 32bit or 64bit ?
• Im Using VPS at DigitalOcean spec : 512 MB Memory / 20 GB Disk / SGP1 - CentOS 6.8 x32
• What version of Centmin Mod ? .07 stable or 08 stable or .09 beta01 or another branch version ?
• 123.08stable
• Was it fresh install or upgrade ?
• fresh install
• Method of install ? Via centmin.sh menu option 1, Git install or curl one liner install as outlined atcentminmod.com/download.html ?
  
• ./centmin.sh install
  
• How long ago did you install Centmin Mod ?
• I had installed 1 on Vultr about 6 month ago?

​

 

I think I successfully installing redis now..

const util = require('util');
const app = require('express')();
const http = require('http').Server(app);
const io = require('socket.io')(http);
const redis = require("redis");

const host = process.env.HOST || '0.0.0.0';
const port = process.env.PORT || 9090;

http.listen(port, host);
util.log('Listening at http://' + host + ':' + port);

io.on('connection', function (socket) {

// util.log("connect");

var redisClient = redis.createClient();

redisClient.subscribe('notification');

redisClient.on('message', function (channel, message) {
util.log("New message in queue " + message + "channel");

message = JSON.parse(message);
// util.log(message.data.data.id);
socket.emit(channel, message.data);
});


socket.on('disconnect', function () {
redisClient.quit();
});

});

but when I run node for upper code
Error: Cannot find module 'redis'
Did i must targeted it to redis location? where is the location instalation of redis?

 

Oh thanks..
But may I know where the file location if I install redis via yum/npm?
I think it must be targeted to redis or something like that.