1 00:00:00,010 --> 00:00:02,340 Okay so let's talk about Route53. 2 00:00:02,340 --> 00:00:04,380 So Route53 is a managed DNS. 3 00:00:04,380 --> 00:00:06,600 And DNS stands for Domain Name System. 4 00:00:06,600 --> 00:00:07,940 And what's an DNS overall? 5 00:00:07,940 --> 00:00:10,200 Well it's a collection of rules and records that will 6 00:00:10,200 --> 00:00:12,870 basically help a client understand how to reach a server 7 00:00:12,870 --> 00:00:13,813 through URL's. 8 00:00:13,813 --> 00:00:16,360 So think of it as what it says it's 9 00:00:16,360 --> 00:00:20,300 routing clients to final addresses. 10 00:00:20,300 --> 00:00:23,670 So an AWS, you have a lot of DNS records available 11 00:00:23,670 --> 00:00:26,530 but the commons that will be asked of you is going to be: 12 00:00:26,530 --> 00:00:29,896 A which is a URL to an IPv4 IP. 13 00:00:29,896 --> 00:00:34,350 AAAA which is a URL to an IPv6 type of IP. 14 00:00:34,350 --> 00:00:37,230 CNAME which is mapping a URL to URL. 15 00:00:37,230 --> 00:00:41,150 And Alias which is mapping a URL to an AWS resource. 16 00:00:41,150 --> 00:00:43,718 Now we'll see CNAME versus Alias in detail in a later 17 00:00:43,718 --> 00:00:46,240 lecture, but for now, remember, 18 00:00:46,240 --> 00:00:48,590 there's just these most common records. 19 00:00:48,590 --> 00:00:50,550 So how does a DNS work? 20 00:00:50,550 --> 00:00:53,730 Well say a web browser wants to talk to an application 21 00:00:53,730 --> 00:00:56,537 server and the application server is at this IP: 22 00:00:56,537 --> 00:00:59,390 32, 45, 67, 85. 23 00:00:59,390 --> 00:01:02,337 What we'll do, is the first thing we'll have to do is 24 00:01:02,337 --> 00:01:03,990 to talk to Route53, and that goes on behind the scenes. 25 00:01:03,990 --> 00:01:06,040 Doesn't mean we have to do the basically, that's how 26 00:01:06,040 --> 00:01:07,530 the whole internet works. 27 00:01:07,530 --> 00:01:10,040 So our browser will make an DNS request say for 28 00:01:10,040 --> 00:01:14,985 myapp.mydomain.com and the Route53 will reply and say 29 00:01:14,985 --> 00:01:17,526 by the way in my records it looks like this domain 30 00:01:17,526 --> 00:01:21,450 has this IP address in A record because I send back in IP. 31 00:01:21,450 --> 00:01:25,863 So URL to IP mapping and I send back the IP 32.45.67.85. 32 00:01:29,280 --> 00:01:32,530 Okay so now my web browser has done the DNS request 33 00:01:32,530 --> 00:01:34,330 and has gotten back an IP from it. 34 00:01:34,330 --> 00:01:38,220 So now it knows directly to make an HTTP request directly 35 00:01:38,220 --> 00:01:40,760 to the IP and it will reach the application server. 36 00:01:40,760 --> 00:01:42,820 And it will say, by the way, the host name it asked for 37 00:01:42,820 --> 00:01:44,800 is myapp.mydomain.com. 38 00:01:44,800 --> 00:01:47,230 And then the application server will just reply with 39 00:01:47,230 --> 00:01:48,460 HTTP response. 40 00:01:48,460 --> 00:01:49,720 So this is how DNS works. 41 00:01:49,720 --> 00:01:51,920 Obviously it's way more complicated but that's the 42 00:01:51,920 --> 00:01:53,130 simplified version. 43 00:01:53,130 --> 00:01:54,910 The first thing that happens is that there's an DNS 44 00:01:54,910 --> 00:01:57,352 request and then there's an HTTP request. 45 00:01:57,352 --> 00:02:00,350 So Route53 can use different things. 46 00:02:00,350 --> 00:02:03,750 It can use public domain name that you own or buy, 47 00:02:03,750 --> 00:02:05,050 and then you can have whatever you want: 48 00:02:05,050 --> 00:02:07,770 application1.mypublicdomain.com. 49 00:02:07,770 --> 00:02:10,118 Or a private domain that can only be resolved 50 00:02:10,118 --> 00:02:12,720 by your instances within your VPC. 51 00:02:12,720 --> 00:02:14,500 So for example, this domain application 52 00:02:14,500 --> 00:02:17,330 application1.company.intneral, that's not something you can 53 00:02:17,330 --> 00:02:18,730 purchase on the internet. 54 00:02:18,730 --> 00:02:20,727 You'll have to make this a private domain and that's 55 00:02:20,727 --> 00:02:23,480 only your applications can resolve this thing. 56 00:02:23,480 --> 00:02:25,926 Now Route53 has a lot of advanced features. 57 00:02:25,926 --> 00:02:29,490 Some will be load balancing and we'll see it how that works 58 00:02:29,490 --> 00:02:30,719 through different kind of records. 59 00:02:30,719 --> 00:02:32,080 There will be health checks 60 00:02:32,080 --> 00:02:33,660 and we'll also see this in details. 61 00:02:33,660 --> 00:02:37,130 And then there's routing policy as we'll see on details 62 00:02:37,130 --> 00:02:40,420 such as simple, failover, geolocation, latency, weighted, 63 00:02:40,420 --> 00:02:41,275 and multi value. 64 00:02:41,275 --> 00:02:45,207 So last thing you should know is that you are going to pay 65 00:02:45,207 --> 00:02:48,420 $0.50 per month per hosted zone. 66 00:02:48,420 --> 00:02:51,530 So Route53 is not something that's free. 67 00:02:51,530 --> 00:02:54,690 There's no free tier and if you go ahead with this tutorial 68 00:02:54,690 --> 00:02:57,360 and buy a domain name you will also have to pay for that 69 00:02:57,360 --> 00:02:58,810 domain name about $12. 70 00:02:58,810 --> 00:03:01,490 So just so you know, if you go along with me with this 71 00:03:01,490 --> 00:03:03,940 lecture then you'll have to pay a little bit of money. 72 00:03:03,940 --> 00:03:06,640 So that's it for the overview, we'll do a deep dive into 73 00:03:06,640 --> 00:03:08,029 menu of these advanced features as well. 74 00:03:08,029 --> 00:03:10,740 But for now let's go ahead and create a domain a domain 75 00:03:10,740 --> 00:03:12,623 name and try out a small record.