17. [SAA/DVA] Routing Policy – Multi Value
So let’s talk about the last routing policy which is MultiValue, which is going to be used when you want to route traffic to multiple resources. And route 53 will therefore return multiple values or resources. Now you can associate them with health checks and so therefore the only resources returned by the MultiValue policy are going to be the ones that are associated with a healthy health check. So up to eight healthy records are going to be Reuters for each multival query. And although it looks like an ELB, it’s not a substitute for having an ELB. The idea is that it’s the client’s side load balancing.
So the second example, we are going to set up multiple A records for our example and we’re associated with health checks. So when a MultiValue query is done by our clients, it’s going to receive up to eight records back and then the client will choose one of them. But at least by combining this with health checks, we know that one of the eight records is going to be the eight records being returned or up to eight are going to be healthy and therefore the client can have very safe queries into them. This is going to be different, for example, when you have a simple routing with multiple values in it, because as you know, the simple routing policy does not allow for health checks and therefore it’s possible that one of the resources returned in the query of a simple routing policy will be unhealthy.
This is why multival you are a little bit more powerful as types of records. So let’s have a look in the UI at how we can test them. So let’s practice the MultiValue records. So let’s go and create a multi record. So multi, blah blah, blah, and then the value of it is going to be linked to US East One. So I will add this value here and then the routing policy is going to be MultiValue. The health check is going to be US East One and the record is going to be US and the TTL is going to be 60 seconds. Let’s add another record. So multi and again we’re going to route to a different region. So this one is AP, southeast one. So the answer is MultiValue answer.
The health check is AP Southeast One and the record ID is going to be Asia and then the record TTL is 1 minute and then finally the last one. So again, one more record name. The value is going to be linked to EU Central one right here. The TTL is 1 minute and the routing policy is MultiValue Answer. And for the health checks we’re going to use the one from EU Central One and the record ID is EU. Okay, so let’s create these records and the records are successfully created. Now let’s test it out. So for this we’re going to use our cloud shell in here. So let’s reconnect to cloud shell. And what I want to do is to test this record. So I will copy the record in here, and then I will clear my screen. And so if I test a Dig on this, then I get three answers. So the three IPS are returned.
And the reason is, well, the three health checks are fully working. So as you can see, they’re all healthy. But if I take one of them, for example, I remove the EU Central one. So I’m going to make this one unhealthy, and I’m just going to trick it by editing and do an invert health status. So this is going to make the healthy unhealthy and vice versa. It’s just a quick way for me to create an unhealthy health check.
So let me pause right now. Okay, so now my EU Central One health check is unhealthy. And so if I reissue a Dig command right here, I should expect to see only two values. Yes, as a result. So the MultiValue answer has worked, and it worked really well. So just to revert this, get this health check, and let’s untick this invert health check status, and we’re good to go. Okay, so that’s it for this lecture. I hope you liked it, and I will see you in the next lecture.
18. [SAA/DVA] 3rd Party Domains & Route 53
So we need to make the distinction between a domain registrar and a DNS service. So actually, you can buy your domain name with any kind of domain registrar you want, and you’re going to pay annual charges. So the way we did it so far in this course was to use the Amazon registrar, okay, through the Route 53 console. But it’s possible for you to use any domain name registrar. So, for example, you can use GoDaddy, you can use Google domains and so on.
Usually, whenever you register a domain with a domain registrar, they will provide you as well with a DNS service to manage your DNS records. So when we created a when we registered a DNS name with a host name with with Amazon, we had a Route 53 hosted zone to manage our DNS records. But it’s possible for you to choose not to use, for example, AWS Route 53 as your DNS records when you have it registered, your domain with Amazon registrar or vice versa. You can, for example, register your domain with GoDaddy. So you’re going to purchase example, yet you’re going to use Amazon Route 53 to manage your DNS records. It’s a perfectly acceptable combination.
So how do we do this? Well, on GoDaddy, you’re going to register your domain, and then you’re going to have the Name Servers option, and you can specify custom name servers. So what do we put in there? Well, first we’re going to go to Amazon Route 53, and we’re going to create a public hosted zone, okay, for any domain we want. And then in the hosted zone details, we’re going to find name servers on the right hand side. So these four name servers are the ones we’re going to have to change on the GoDaddy website so that when GoDaddy answers a query, hey, which name server should I use? The name servers are going to be pointing to Amazon Route 53 name servers. And therefore, we can use Amazon Route 53 to manage all the DNS records directly from that console.
So, to summarize, if you buy your domain on a third party registrar, you can still use Route 53 as your DNS service provider. For this, you will create a public hosted zone in Route 53, and then you will update the NS or Name Servers records on the third party website where you buy your domain. And then you’re going to point them to the root 53 name servers. So, just so you know, a domain registrar looks like, but is different from a DNS service, even though every domain registrar usually comes with some DNS features. So that’s it for this lecture. I hope you liked it, and I will see you in the next lecture.
19. S3 Website with Route 53
So a question that can come up is how to enable an Sree website with route 53. So say your website wanted to be Acme dot example. com and you own the domain name example. com. So for this, you want your users to access your website through Acne dot example. com with the Http protocol. And so first you need to create an S three bucket with the exact same name. And this is very, very important to have the exact same name as the target records. So Acme example. com has to be created. Then we enable the S three buckets to be a website and also make sure that the objects are public. Then we’re going to go into route 53 and we’re going to create an alias record to the SV website. Endpoint of type A with the IP 54 address. So in here we’re going to specify the record name. At me example type is A and the value is going to be S three website. Then the region name amazonitos. com.
And then because we are matching the record name to the Sri bucket name, then automatically the users are going to be able to access our estra bucket through that URL, as you’ll see. Just a note that this only works for Http traffic, not for Https. For this you will need to use a CDN solution such as cloud front first. So let’s go into the hands on to practice this. Okay, so we would like to have an Svocet to be at Blog Stefanoticher. com and to just display some information. So what I’m going to do is go into Amazon history and I’m first going to create an entry bucket being public. So I’ll call it blog. Stefanthewcher. com. And it has to absolutely match the name you’re going to give in the record in route 53, otherwise it’s not going to work. So this is an exam question.
You need to make sure that the bucket name matches the record in route 53. Okay, so now we display a region. We’re going to allow public access and acknowledge this is okay. And then I’m going to click on Create Buckets. Now I need to go into my buckets and I will go ahead and upload some files. So let me click on Add files and then find my S three. And I’m going to add my index and my coffee files. Okay, so we’re good to go. Now in terms of permissions, I can just grant public access to these objects and we should be good to go and click on Upload. So my objects are not public in my bucket. And so if I click on Properties now and look for the website settings, then at the very, very bottom I can find static website hosting. I will enable it and then we’re going to host a static website.
Okay? And the index document is index HTML. Let’s save our changes and we’re good to go. So now if I go into my file right here and look at the URL itself. So this URL shows me that this file, this file is public. So this is great. Okay. And we are, if I go into now the website settings at the very bottom, we have this website right here available to us. And we can see that, yes, we are able to access it at blog dot stefano teacher. com dot s three website uCentral one. And this is a very long URL. OK, so now we want to just shorten this URL to just be Blog dot Stefanotcher. com. And so to do so this is just not done yet. Okay? So to do so, I need to go into route 53 and I need to create a new record. Now the record name is going to be Blog. The record type is going to be an A record and then the value is going to be an alias. Now we’re going to route the traffic to an Sfree website endpoint.
We need to choose a region so EU central one, and then the endpoint itself has to be Blogdefinedg. com, which is the name of my bucket name. Okay, it has to be the exact same as you can see it says SRA website EU central one, that Amazon exists. And so it understands that it should find this bucket right here, this bucket right here, because the name of my record is exactly the same as my bucket name. So this is the trick part here. But when we’re good to go, we click on Create record.
Now this record has been created. So we have Blog Stefano, tshirt. com and let’s wait a little bit for things to be replicated and then try to go to that URL. So let me open a new tab, paste the URL. And now using Blog Stefanother. com, I am able to access my Sree website hosted on S Three. And so this is pretty cool. We don’t have Https enabled, we cannot enable Https with S three websites. For this. We would need to use something like cloud Front to use a custom domain and an S Three website. But at least we have seen how to do it, how to link route 53 alias record into your S Three buckets. So I hope you liked this lecture and I will see you in the next lecture.
20. [SAA/DVA] Route 53 – Section Cleanup
Okay? So let’s clean up what we’ve done in Route 53 if you wanted to avoid some cost. So the domain name you’ve bought, of course, stays in your account. And it will cost you $12 a year if you wanted to renew it, or more if you bought a more pricey domain name, the domain name itself. So the hosted zone, if you’re not using it, you can delete this hosted zone by first emptying all the records. Otherwise it will cost you fifty cents per month to keep this hosted zone alive. Okay? Within it, it doesn’t matter if you have many records, you can just leave them as is. This is fine. The other thing we have to delete is all our EC two instances in our different regions as well as our ALB. So we had EC two instances in three different regions.
So what I’m going to do is just delete them one by one. So there was one from me in Frankfurt, and I believe that the load balancer had created is also here. So let me delete this load balancer as well. And we can also delete the associated target group with that load balancer. This is good. And we have to perform the same kind of cleanup in other regions. So for me was US East One, where I’m going to go ahead and delete another, terminate another east two instance and finally do the exact same thing in AP Southeast One. After this, you should not incur any costs of these lectures. Okay? So I really hope you liked this section and I will see you in the next lecture.
