1

00:00:02,200 --> 00:00:07,000

So in this session we are going to set up Redis cluster on a  Demo Environment.



2

00:00:07,030 --> 00:00:12,640

So when I'm saying Demo Environment,  we are going to set up Redis cluster on a single server.



3

00:00:13,060 --> 00:00:19,390

However we are going to create multiple copies of Redis. So   on the same server basically we are going



4

00:00:19,390 --> 00:00:25,710

to launch six Redis instances.  Now the steps to do that is very easy.



5

00:00:25,720 --> 00:00:28,570

And also when you are doing the set up in the Production.



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00:00:28,750 --> 00:00:36,370

So underlying steps remain the same.  So to begin with I have downloaded Redis software and I have



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00:00:36,370 --> 00:00:40,120

extracted it and now we have Redis-stable folder.



8

00:00:40,840 --> 00:00:43,060

So if I go inside where Redis-stable,



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00:00:46,430 --> 00:00:48,790

this is a structure which you see. This is the default one.



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00:00:49,060 --> 00:00:49,640

Okay.



11

00:00:50,800 --> 00:00:52,750

So what I'm going to do here is,



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00:00:56,420 --> 00:01:03,380

these are the Minimum configuration File, which you need to have in order to  start a node in



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00:01:03,380 --> 00:01:04,460

a cluster mode.



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00:01:04,500 --> 00:01:05,130

Okay.



15

00:01:05,270 --> 00:01:14,370

So when you are setting up Redis cluster.  Basically first you need to start each of the nodes.



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00:01:14,500 --> 00:01:14,760

Okay.



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00:01:14,780 --> 00:01:19,220

So each of the nodes you need to start individually and then you run Create Cluster



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00:01:19,220 --> 00:01:22,040

Command,  which is shown here.



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00:01:22,130 --> 00:01:27,640

So then you run Create Cluster, which is going to set up a cluster.  Okay.



20

00:01:27,670 --> 00:01:37,160

So I'm going to copy this configuration and please remember this is only for one node.



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00:01:37,350 --> 00:01:42,720

So if you are running on 6 different Servers, then you can copy paste exactly the same.



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00:01:42,720 --> 00:01:49,830

However if you're running all the six instances on the same server. In that case we need to make changes



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00:01:49,830 --> 00:01:51,030

in the Port.



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00:01:51,150 --> 00:01:51,380

Okay.



25

00:01:51,390 --> 00:01:52,860

So I will tell you what we need to do.



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00:01:59,830 --> 00:02:08,110

So here I'm going to create a file, which is going to be called N 1



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00:02:08,160 --> 00:02:08,410

Okay.



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00:02:08,410 --> 00:02:11,280

This is the one which is going to be denoting Node one.



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00:02:11,740 --> 00:02:14,570

And then I'm going to say redis.conf.



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00:02:15,520 --> 00:02:15,780

Okay.



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00:02:15,790 --> 00:02:22,170

So notice this new Configuration File, which we're creating.  In all of our previous examples we had a



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used Redis.conf



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00:02:24,690 --> 00:02:25,010

Okay.



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So just to make it simple. I'm just going to create a new configuration file and inside this I'm going



35

00:02:30,790 --> 00:02:33,650

to paste whatever we had copied.



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00:02:33,820 --> 00:02:34,670

Okay.



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Also I'm going to change the Port from 7000 to 7001.



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00:02:39,940 --> 00:02:44,220

So our Node 1 is going to have port of 7001



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00:02:44,260 --> 00:02:44,470

Okay.



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00:02:44,470 --> 00:02:46,690

This is  the Client port.



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00:02:46,710 --> 00:02:50,250

So when you're connecting to Redis from Redis Client.



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This is a port which you need to provide.



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00:02:52,990 --> 00:02:58,930

So other than that, we don't need to make any changes. So I'm just going to save and exit.



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00:02:59,320 --> 00:03:00,220

Okay.



45

00:03:00,340 --> 00:03:08,200

And if I do a ls-lrt  again. Now you see we have n1_redis.conf



46

00:03:08,890 --> 00:03:12,370

So now I need to repeat this process six times.



47

00:03:12,370 --> 00:03:12,710

Okay.



48

00:03:13,210 --> 00:03:23,700

So I'm going to create a copy of this and going to name it N 2 for Node 2.



49

00:03:23,730 --> 00:03:29,620

And similarly I will do the same for Node 3 and I will do the same for Node 4.



50

00:03:30,600 --> 00:03:33,630

I'm going to do the same for Node 5 and 6 as well.



51

00:03:38,410 --> 00:03:38,980

okay.



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00:03:39,020 --> 00:03:45,440

Now if we do ls-lrt, we can see we have 6 Configuration File.



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00:03:45,980 --> 00:03:54,560

However remember since we have copied all the configuration file from N 1.  So all in all the configuration



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00:03:54,560 --> 00:03:56,410

file, Ports are going to be same.



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00:03:56,420 --> 00:04:00,490

So we must manually make sure that we are changing the port.



56

00:04:01,010 --> 00:04:05,650

So I'm going to go to n2_redis.conf



57

00:04:06,650 --> 00:04:13,870

And here I'm going to change the port to 7002  and for the third file N 3



58

00:04:13,970 --> 00:04:17,480

I'm going to change the port to 7003



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00:04:21,080 --> 00:04:29,060

I'm editing this in VI Editor, but you can use any Editor. Just make sure the steps which you are following



60

00:04:29,060 --> 00:04:34,190

is the same.  Here I'm going to change it  to 7004



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00:04:34,190 --> 00:04:37,480

This is a Fourth Node and for Fifth Node,



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00:04:37,490 --> 00:04:41,360

I'm going to change the port to 7005



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00:04:47,280 --> 00:04:53,470

if you are good in Scripting,  you can in fact create a Script,  which can do all this task, which I am doing.



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00:04:58,560 --> 00:04:58,860

OK.



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00:04:58,900 --> 00:05:04,730

So now we have all of this file which is set up with correct things.



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00:05:07,630 --> 00:05:12,400

Now let me do cat on all of this file.



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00:05:12,980 --> 00:05:13,240

OK.



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00:05:13,270 --> 00:05:21,490

So if I do cat n* ,since all our file begins with n. So now we can do cat n*



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00:05:21,510 --> 00:05:22,140

and.



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00:05:22,150 --> 00:05:29,170

And here I can see all my six Configuration File.  So I can see .OK I have correct Port Setup.



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00:05:29,170 --> 00:05:33,170

So it is starting with 7001, 2, 3,4,5,6



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So everything looks okay.



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00:05:36,090 --> 00:05:41,460

And this also marks that our  step one is completed.



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00:05:41,460 --> 00:05:45,460

So this Configuration File,  we have created 6 copies.



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And also we have changed the configuration and when i am saying, changing the Configuration.



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00:05:51,520 --> 00:05:55,120

Basically we updated the port number.



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00:05:55,160 --> 00:06:01,670

Now I'm going to create 6 directories and I'm going to move each of this configuration file to its



78

00:06:01,700 --> 00:06:02,900

respective directory.



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00:06:06,540 --> 00:06:14,640

So the command here basically is going to create six directories. So I want directory something like



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00:06:14,730 --> 00:06:18,270

7001 then 7002



81

00:06:18,530 --> 00:06:19,370

Okay.



82

00:06:19,680 --> 00:06:23,190

So rather than this I'm just going to use this command.



83

00:06:23,190 --> 00:06:27,480

So this is basically a pattern and this is going to create 6 directories.



84

00:06:27,480 --> 00:06:33,570

And if I do ls-lrt  again.  Now you can see, we have 6 new directories created.



85

00:06:33,570 --> 00:06:41,320

So it is starting with 7001, 7002, 7003, 7004, 7005, 7006. Now I'm going to copy



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00:06:41,470 --> 00:06:49,150

each of the configuration file to its directory.  so N1,  I'm going to copy to 7001 and N 2



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00:06:49,150 --> 00:06:51,190

going to be copied to 7002



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00:06:52,210 --> 00:06:53,470

Okay.



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00:06:53,470 --> 00:06:58,620

In fact rather than copying, I will just move this Configuration File to its directories.



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00:06:58,690 --> 00:07:05,020

So I'm going to run mv command and going to move N1 to 7001



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00:07:10,720 --> 00:07:45,660

and we need to repeat the same for all the nodes.



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00:07:46,160 --> 00:07:47,400

Okay so this is done.



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00:07:47,420 --> 00:07:49,730

If I do ls-lrt  again.



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00:07:49,730 --> 00:07:55,640

Now I do not see all this configuration file because all the configuration file has been moved inside



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00:07:55,880 --> 00:07:58,500

the respective folders.



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00:07:58,520 --> 00:08:05,750

So now we will go to each of the folders one by one and we will start Redis  servers and also we



97

00:08:05,750 --> 00:08:07,340

will pass the Configuration File.



98

00:08:07,830 --> 00:08:08,240

Okay.



99

00:08:08,720 --> 00:08:17,420

So rather than going inside, you can also or let's just keep it simple.  Let's go inside the folders.



100

00:08:17,420 --> 00:08:25,190

So now I'm inside 7001 and here if I do  ls,  I can see there's a Configuration File



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00:08:25,190 --> 00:08:25,490

there.



102

00:08:25,910 --> 00:08:31,400

So now we're going to do Redis -server to start Redis.



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00:08:31,490 --> 00:08:39,410

And also we are going to provide this Configuration File,  also I will use & to start this in background



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00:08:40,550 --> 00:08:44,380

and hit enter. Okay.



105

00:08:44,420 --> 00:08:51,590

So this is the first one, which has started.  Here you can see that,  when you provided those directive, which



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00:08:51,590 --> 00:08:59,530

is related to Redis Cluster.  Now it can see that it is a,  it is going to be or supposed to be running in



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00:08:59,540 --> 00:09:05,650

a Cluster Mode.  So you also see message saying, Running in  Cluster Mode and Port is shown here as



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7001.



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00:09:06,290 --> 00:09:11,050

So if remember our first node is, we had provided the Port number of 7001



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00:09:11,860 --> 00:09:13,390

So everything looks okay here.



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00:09:13,840 --> 00:09:23,560

And right now we are into this directory.  So I'm going to go back to 7002 and then we are



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going to run Redis-server and we need to provide this Second Configuration File.  Hit enter



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and then I will repeat the same process for all the 6 Nodes.



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I have started 3 nodes and now this is the fourth node which i am going to start



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00:10:30,980 --> 00:10:34,060

and now sixth one  is also started.



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00:10:35,200 --> 00:10:44,700

Okay so here if I do ps-ef grep redis.  Now we can see we have 6 nodes,  which are running



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as a Cluster.



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00:10:46,840 --> 00:10:47,190

Okay.



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So other than this we also need to run Redis cli command,



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Okay to create the cluster.



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00:10:59,290 --> 00:11:08,760

So again here make sure you provide this Cluster Create Command and you provide all the IP addresses, where your



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00:11:08,770 --> 00:11:10,760

Redis is running.  In my case



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all of them are running on local host.



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So I have provided 127.0.0.1



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And also you need to provide the Port of each of the instances,  where it is running and in the end we have



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--cluster replicas



127

00:11:28,330 --> 00:11:29,340

And we have given 1



128

00:11:29,350 --> 00:11:34,970

So basically this is the number of your replicas.



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00:11:34,970 --> 00:11:38,500

So here you see the structure or the topology.



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We are trying to install is this one.  So we are going to have 1 Master and 1 replica, which is Slave



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Node for each of the Masters.



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Okay.



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00:11:49,760 --> 00:11:53,110

So I'm going to copy paste this from here.



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Okay.



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And let's hit enter.



136

00:11:58,960 --> 00:12:06,290

So once you hit enter, it is telling you that,  this is a Configuration which is, it is going to deploy.



137

00:12:06,300 --> 00:12:09,760

So it is going to create 3 Masters and 3 Slaves.



138

00:12:10,020 --> 00:12:10,380

Okay.



139

00:12:10,380 --> 00:12:14,570

And the Masters are going to be 7001, 2 and 3.



140

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Okay.



141

00:12:14,910 --> 00:12:15,320

So notice,



142

00:12:15,320 --> 00:12:22,380

whatever you passed in the beginning.  These are going to be Masters and whatever you passed later



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00:12:22,380 --> 00:12:24,130

on, these are going to be Slaves.



144

00:12:24,510 --> 00:12:26,500

If you want to change it, you can change it.



145

00:12:26,520 --> 00:12:28,380

In this case I'm just going to keep it.



146

00:12:28,530 --> 00:12:29,820

Yes.



147

00:12:29,910 --> 00:12:31,390

Hit enter.



148

00:12:32,070 --> 00:12:38,470

And now this is running Cluster Creation Scripts. Okay.



149

00:12:38,470 --> 00:12:39,580

And we see the output.



150

00:12:39,700 --> 00:12:46,090

And I do not see any error.  So which means cluster is successfully started.



151

00:12:46,660 --> 00:12:47,040

Okay.



152

00:12:54,260 --> 00:12:58,760

Now one more thing which you can see here is, the Slots.



153

00:12:59,230 --> 00:12:59,450

Okay.



154

00:12:59,480 --> 00:13:07,040

So you see Master is having Slot of 0-5460



155

00:13:07,140 --> 00:13:12,440

So as I told you, in Cluster data is stored into  partition.



156

00:13:12,440 --> 00:13:12,670

Okay.



157

00:13:12,680 --> 00:13:16,070

So basically there are total 16000 partitions.



158

00:13:16,070 --> 00:13:22,730

And since we have 3 master servers. 16000 is divided into 3 and each of the Master Series is going



159

00:13:22,730 --> 00:13:25,520

to have that many number of Slots.



160

00:13:25,610 --> 00:13:28,340

So if you divide 16000 by 3



161

00:13:28,490 --> 00:13:36,720

So you are going to get approximately 5461 for each of the node.



162

00:13:36,890 --> 00:13:37,190

Okay.



163

00:13:37,220 --> 00:13:40,880

That is what has happened. So that is the same you can see in the configuration



164

00:13:43,990 --> 00:13:47,540

so now if I hit enter. I'm just going to come back to Shell.



165

00:13:48,370 --> 00:13:52,390

And now we can connect to Redis,  using Redis Client.



166

00:13:52,420 --> 00:14:00,120

So I'm going to use Redis-cli and we need to provide Port.  Notice if



167

00:14:00,130 --> 00:14:03,560

I do not provide Port here,  if I just hit enter.



168

00:14:03,670 --> 00:14:05,050

It is going to give us error



169

00:14:05,040 --> 00:14:11,170

that Connection is refused,  because if you see,  by default it is trying to connect to 6 3 7 9 port.



170

00:14:11,980 --> 00:14:17,590

So what we need here is,  because we know our cluster is running on different ports.



171

00:14:17,590 --> 00:14:25,240

Again if you just want to see all the services you can do ps-ef grep redis and



172

00:14:25,240 --> 00:14:29,280

you can see these are the Ports,  where our Redis services are running on.



173

00:14:29,280 --> 00:14:35,800

So I'm going to now use Redis-cli and -p,   I'm going to provide 7001



174

00:14:35,830 --> 00:14:38,640

So you can connect to any node.



175

00:14:38,680 --> 00:14:44,200

I'm just going to connect to 7001 and now you see,  we are connected and we have not got



176

00:14:44,320 --> 00:14:51,450

any error.



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00:14:51,460 --> 00:14:54,130

So now I'm going to connect to Redis cli



178

00:14:54,130 --> 00:15:00,970

And then we'll be running some Key Value Pair. Basically we'll do some write and read operations.



179

00:15:00,970 --> 00:15:05,830

So when you're connecting to Redis cluster.  You can provide -c parameter.



180

00:15:05,830 --> 00:15:12,240

So which  is going to make it Cluster aware.



181

00:15:12,740 --> 00:15:20,600

So here you can type Redis-cli and then you can type this -c  parameter.  Okay,  which



182

00:15:20,600 --> 00:15:27,710

is just going to make this Client aware that you are connecting to a Cluster and then you can provide



183

00:15:27,950 --> 00:15:33,220

-p,  followed with the Port,  which



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00:15:33,230 --> 00:15:37,990

Your Redis is running.  So here it is running on 7001. So I have provided 7001



185

00:15:38,000 --> 00:15:46,780

So we have basically 6, if I exit from here if I do ps-ef grep redis,  you



186

00:15:46,780 --> 00:15:50,290

can see we have 6 instances running.So you can connect to any of that.



187

00:15:50,800 --> 00:15:56,440

So I'm connecting to  7001, but if you want,  you can connect to  7002 or any



188

00:15:56,440 --> 00:15:57,020

instance.



189

00:15:57,140 --> 00:15:57,460

OK.



190

00:15:57,610 --> 00:16:07,310

So let's move back to  7001 and here if we perform this write operation



191

00:16:14,870 --> 00:16:23,360

Now you see, when we perform this write operation,  it saying the message of Redirected to slot this one.  So



192

00:16:23,360 --> 00:16:30,170

if you remember,  when we set up Redis  Cluster,  all of the masters were assigned some number of Slots.



193

00:16:30,170 --> 00:16:40,990

So when we wrote this Key Value Pair,  Redis calculated hash of this key which is foo,  and then that



194

00:16:41,080 --> 00:16:46,840

Hash was in the slot,  which is actually kept on this Master Server.



195

00:16:46,840 --> 00:16:52,470

That's why  internally it Redirected this to correct Slot.



196

00:16:52,480 --> 00:16:52,740

OK.



197

00:16:52,750 --> 00:16:58,390

Again this is something which is taken care internally.  You don't need to worry about.  Okay all of these



198

00:16:58,390 --> 00:17:01,330

things are going to be taken care internally by Redis.



199

00:17:01,780 --> 00:17:09,640

Now here if I set  Value of Hello World, again you see this was supposed to be kept  in this slot, which is



200

00:17:09,640 --> 00:17:12,550

on this address.



201

00:17:12,610 --> 00:17:15,000

So it has redirected again to this address.



202

00:17:15,000 --> 00:17:17,230

Here also you can see your client.



203

00:17:17,230 --> 00:17:24,100

Initially we had connected to 7001,  then based on the slot where it was supposed to perform



204

00:17:24,100 --> 00:17:28,020

this action.  It had  changed the address.



205

00:17:28,020 --> 00:17:34,000

And again in Third Action,  address has been changed.



206

00:17:34,040 --> 00:17:37,450

So now what is going to happen,  if you perform Read operation.



207

00:17:37,450 --> 00:17:37,670

OK.



208

00:17:37,700 --> 00:17:45,960

So as we know,  when we wrote value of foo,  it was stored into or stored to this address.



209

00:17:45,980 --> 00:17:46,280

Okay.



210

00:17:46,280 --> 00:17:52,320

So right now we are connected to 7001 Port and this is the one which is running on



211

00:17:52,320 --> 00:17:52,920

7003



212

00:17:53,300 --> 00:17:59,720

So in this case,  when it is trying to get this value from this server.  Basically this value is not going



213

00:17:59,720 --> 00:18:05,420

to be available and because the hash of this is here.



214

00:18:05,450 --> 00:18:08,560

So again it is going to do a Redirect action.



215

00:18:08,570 --> 00:18:17,480

So let's see that,  Ok as we hit enter.  We can see now it has again Redirected it to the correct address.



216

00:18:17,520 --> 00:18:21,160

So internally Cluster is aware of all of these Slots.



217

00:18:21,240 --> 00:18:27,310

And that's why it is able to recognize where the request needs to be sent to. OK



218

00:18:31,730 --> 00:18:32,810

I have exited.



219

00:18:32,800 --> 00:18:37,040

Now let's see what else we can see.



220

00:18:37,040 --> 00:18:37,580

So



221

00:18:45,530 --> 00:18:46,730

and this is very good



222

00:18:46,730 --> 00:18:47,270

Command.



223

00:18:47,270 --> 00:18:53,690

This is a command which you can use to see status of Redis Cluster and what is the role  of each of the



224

00:18:53,690 --> 00:18:54,320

node.



225

00:18:54,320 --> 00:18:55,580

So if I run  this Command



226

00:18:59,110 --> 00:19:05,200

again you saw I got the error because the port which, which was there is 7000.



227

00:19:05,230 --> 00:19:09,710

But we do not have Redis,  any of the Redis running on 7000.



228

00:19:09,700 --> 00:19:11,930

We are having it running from 7001



229

00:19:11,930 --> 00:19:16,720

So we need to change the port and Lets say,  I want to connect to this instance.



230

00:19:16,940 --> 00:19:24,230

You can run this  command from any of the Redis Client. So I'm going to hit enter and now we're able



231

00:19:24,230 --> 00:19:32,290

to connect and we get the value about Masters and also get the information about Slaves.



232

00:19:44,420 --> 00:19:47,420

The other good command is,  this one Cluster nodes.



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so what it does is, it is going to give you information of all the nodes.  Okay and



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so this is how it gives all the information.



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And now you can see we have a Master Node, then we have another Master Node and this is the Third Master



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Node and we also have 3 Slave Nodes.  Okay now let's shut down one of the Master Server and see what



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happens.



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Okay.



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So I will do Redis-cli-P 7001 and then I will do shut down.



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Okay.



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So what this is going to do is.  It is going to shut down



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this one.  Okay because this is the service,  which is running on 7001.  So it is going to shut



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down this instance and then we should be seeing any other Slaves becoming the Master.



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Okay.



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So basically whatever, whoever was the Slave of this master is going to become,  Next Master.



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Okay so let's hit Enter



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okay.



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Now you can see all the logs



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so let's try to understand the logs here.



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So if you see from here.



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So we actually tried to shutdown one of the Masters and then it got disconnected.



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Okay.



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And after that



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Cluster got over there there is a state changed.



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Okay.



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And after that it started performing other action,  to make other Slave Node turn into a Master.



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Okay now I'm going to hit enter and we're going to run the same



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Command  to  check information about all the Nodes.  so once you hit enter.  This time you see 7001 is



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already down.



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So we would't be able  to connect to 7001



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So I'm going to just connect to other available nodes. So which is let's see  7003



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And once we do that.  Now we can see,  previously we had 7001,7002 and



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7003 as a master.



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And now we have 7005,  turn to a Master.



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Okay



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so this was previously the Slave of 7001 node.



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So



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again you can play around with Redis Clustering.  You can install it in Demo Environment and then you



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can also play around with available Clients,  which can interact with Redis Cluster.



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So I usually use  Python,  but you can use python or Jython  or probably any other available Clients



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depending on the need of your project and then you should play around in the Development.



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And that's how you're going to learn more.