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These are the user uploaded subtitles that are being translated: 1 00:00:00,630 --> 00:00:06,990 So as we said before, the unscientific definition of cloud is compute, networking, storage and other 2 00:00:06,990 --> 00:00:09,480 services managed by someone else. 3 00:00:10,180 --> 00:00:13,380 But actually there is a more formal definition of cloud. 4 00:00:13,770 --> 00:00:18,570 And this definition comprised of the five characteristics of cloud computing. 5 00:00:18,960 --> 00:00:27,720 And these characteristics are on demand self-service road network access, resource pooling, rapid 6 00:00:27,720 --> 00:00:31,170 elasticity and measured service. 7 00:00:31,710 --> 00:00:36,800 So let's go through these characteristics and explain exactly what is each one of them. 8 00:00:37,320 --> 00:00:40,370 And let's begin with the on self-service. 9 00:00:41,370 --> 00:00:46,800 What is basically means is that no human interaction is needed for resource provisioning. 10 00:00:47,280 --> 00:00:53,400 That means that if I need a new virtual machine or VM, I don't need to send an email to someone or 11 00:00:53,400 --> 00:00:55,320 to pick a phone and talk to someone. 12 00:00:55,470 --> 00:00:58,160 I can do that with a click of a button. 13 00:00:58,650 --> 00:01:05,850 I just go to some Web app, define exactly what I need, click the create or next or add or something 14 00:01:05,850 --> 00:01:06,290 like that. 15 00:01:06,510 --> 00:01:09,480 And after a few minutes I will get my virtual machine. 16 00:01:09,510 --> 00:01:13,240 I don't need to speak with anyone in order for that to happen. 17 00:01:13,490 --> 00:01:19,710 Now this provisioning is available 24/7, which made possible by the fact again, that I do need to 18 00:01:19,710 --> 00:01:20,760 speak to anyone. 19 00:01:20,970 --> 00:01:22,710 Everything is automated. 20 00:01:23,670 --> 00:01:28,230 So that is the On-Demand Self-service Road Network. 21 00:01:28,230 --> 00:01:35,700 Access means that resources that I create in the cloud can be accessed from anywhere using the network. 22 00:01:36,420 --> 00:01:44,310 So I can, for example, create a virtual machine in the US and access it from my home in Israel. 23 00:01:45,130 --> 00:01:52,080 Now ideally that means that we have high broadband because I really need a good network and high bandwidth 24 00:01:52,080 --> 00:01:56,520 in order to access the resources that are just created on the other side of the world. 25 00:01:57,150 --> 00:02:00,800 In addition, no physical access is required at any time. 26 00:02:01,140 --> 00:02:07,170 So at no point in time do I need to access the physical host machine, either data center to perform 27 00:02:07,170 --> 00:02:12,060 some maintenance or to check things or maybe to take cables or anything. 28 00:02:12,240 --> 00:02:18,900 I don't need and actually I can't have and I'm forbidden to have physical access to this resource. 29 00:02:20,160 --> 00:02:23,070 The next characteristic is resource pulling. 30 00:02:23,640 --> 00:02:28,730 No resource pulling means that physical resources are shared between customers. 31 00:02:29,250 --> 00:02:35,220 So if I have a huge Hosta machine and I create a virtual machine on it, then it's very possible that 32 00:02:35,220 --> 00:02:41,400 other customers, which I have no knowledge of, also will use this very same machine to create their 33 00:02:41,400 --> 00:02:42,840 own virtual machine. 34 00:02:43,140 --> 00:02:47,300 In no way and in no time will they be able to contact these customers. 35 00:02:47,310 --> 00:02:53,190 I will have no idea who the customers are and of course I won't have any access to their resources. 36 00:02:53,460 --> 00:02:56,790 But still, the physical resources might be shared. 37 00:02:57,870 --> 00:03:03,370 The cloud backbone decides which physical resource to allocate for a customer's virtual services. 38 00:03:03,720 --> 00:03:10,710 So in most cases, I don't have any control and I can't decide which exact or specific cost machine 39 00:03:10,950 --> 00:03:11,910 do I want to use. 40 00:03:12,210 --> 00:03:16,370 This is up to the cloud backbone or the control center of the cloud. 41 00:03:16,710 --> 00:03:19,030 It is the one who make these decisions. 42 00:03:19,540 --> 00:03:25,590 Now, some advanced cloud services allow for physical resource separation, mainly for security reasons. 43 00:03:26,040 --> 00:03:32,850 Some services, for example, allow us to define that this service is going to be created on a separate 44 00:03:33,120 --> 00:03:34,230 physical host. 45 00:03:34,870 --> 00:03:40,110 They still do not allow us to select which host to use, but we can still define that. 46 00:03:40,110 --> 00:03:41,490 We want to use a separate host. 47 00:03:41,800 --> 00:03:48,060 Of course, these services are considerably more expensive than the usual ones, but still it's possible 48 00:03:48,060 --> 00:03:50,040 and it's up to us to make this decision. 49 00:03:50,970 --> 00:03:57,900 The next characteristic is rapid elasticity, and that means that resources can be scaled up and down 50 00:03:57,900 --> 00:03:59,580 as needed automatically. 51 00:04:00,090 --> 00:04:05,970 So if you remember the example that we discussed earlier about the electric job, then if we had this 52 00:04:05,970 --> 00:04:12,570 capability of scaling up and down and helping our two service to become four on November and then back 53 00:04:12,570 --> 00:04:15,960 to two on December, then that would be great. 54 00:04:16,140 --> 00:04:19,010 And this is exactly what the cloud enables us. 55 00:04:19,530 --> 00:04:25,380 There is no need to purchase resources for a one time peak scenario again, which was the exact problem 56 00:04:25,710 --> 00:04:27,480 we had in our example. 57 00:04:27,810 --> 00:04:33,360 And this is one of the most important capabilities of the cloud in one of the great motivations of all 58 00:04:33,360 --> 00:04:35,970 premise organizations to move to the cloud. 59 00:04:36,270 --> 00:04:43,500 As we will see later in our own example, this works rather well, and the last characteristic is misfold 60 00:04:43,500 --> 00:04:44,190 service. 61 00:04:44,760 --> 00:04:50,250 Mission service means that the payment is done only for resources actually used. 62 00:04:50,790 --> 00:04:56,760 So that means, again, that if I decide to use, let's say, two virtual machines, then I pay only 63 00:04:56,760 --> 00:04:58,440 for those two virtual machines. 64 00:04:58,680 --> 00:04:59,680 If later I. 65 00:04:59,960 --> 00:05:05,540 Another one, then I will pay for this one also, and if after that I decide to shut it down, then 66 00:05:05,540 --> 00:05:08,250 at this exact moment I stop paying for it. 67 00:05:08,480 --> 00:05:16,190 So some examples for how to measure the service we use is, for example, paying for Silvertown, which 68 00:05:16,190 --> 00:05:23,840 is the example we just discussed, DBI storage, where we pay for the storage we use in a database function 69 00:05:23,840 --> 00:05:26,610 calls, which we will discuss later and so on. 70 00:05:26,840 --> 00:05:31,670 So basically, as you can see, we pay only for what we actually use. 71 00:05:32,120 --> 00:05:38,900 The measurement usually done in high resolution, for example, server time is measured by the second 72 00:05:39,020 --> 00:05:41,900 and not, for example, by the hour or by the day. 73 00:05:42,590 --> 00:05:48,980 And the very important bottom line here is that we do not need to invest money in unused resources. 74 00:05:50,000 --> 00:05:53,300 So these are the five characteristics of cloud computing. 75 00:05:53,300 --> 00:05:56,050 And I hope that by now you understand better. 76 00:05:56,240 --> 00:06:02,720 What are the advantages of using cloud and how it can help you use your resources more efficiently and 77 00:06:02,720 --> 00:06:03,320 effectively. 8498