Subnet Overview and Hands On So next, here comes the time to add subnets. Now, subnets are going to be tied to specific Availability Zones. In this diagram, I’m just doing one AZ. But in practice, we’ll do two AZ just to have some kind of high availability. And so within each AZ, our goal is to create different subnets. And so we’ll create a public subnet and a private subnet, and we’ll see how to make one public and how to make one private in the future, hands on….

Section Introduction For networking. Also, we need to know in and out how to create, operate and manage a VPC. Troubleshooting is also very important. So we’ll look at Amazon Vpc and AWS Direct Connect in this section. Now you may be asking me, oh, I already know how to do Vpc and I say I hope you do. But trust me for to know how to do a VPC you need to look at this diagram and understand everything that goes in there. So have a good look. If…

Routing Policy – Geolocation Okay, let’s talk about the Geolocation routing policy. So it is different from latency based, this one is routing based on the user location. And so here we are saying okay, traffic that originates from the UK should go to this specific IP if that’s a record. And on top of it we should create a default policy in case for example we get a user from Germany, but we haven’t specified a routing policy specifically for Germany. Then we say okay, by default you go…

Route 53 Health Checks So there are health checks in route 53 and the idea is that if an instance is unhealthy just like an Elb, route 53 will not send traffic to that instance. So how do we know if a health check failed? Well, basically an instances or an IP or a URL, whatever you want is deemed unhealthy if it fails three health checks in a row and it’s deemed healthy if it passes three health checks in a row. So pretty easy. Now, the default health…

CNAME vs Alias So let’s try to understand the difference between a CNAME record and an alias record. So if you have an AWS resource that could be a load balancer or cloud front, it will expose an AWS host name. For example, if I have a load balancer, it could be LB 1234 dot es two elb Amazon U s. com. So this is a URL that Amazon Web Services controls. But you don’t. What you want to do is to expose your application as myapp dot my domain….

Section Introduction Now, we’re getting into the networking sections, and this one is about Route 53. Now, Route 53 is an easy topic when you think about it. Before a sysps exam, you’re supposed to know Route 53 in and outs. So we’ll have an in depth look and we’ll understand the Ttl and the implications of the Ttl CNAME versus alias. We’ll understand about health checks and we’ll learn about all the routing policies in depth. That includes simple weighted latency failover location and MultiValue. I have included graphs…

Config Overview Okay, let’s get into a very popular exam topic which is AWS config. So it helps with auditing and compliance of your AWS resources. So what does that mean? That means that we’re going to record configuration and changes over time. So as we start modifying the configuration of our ECU instances, EBS volumes, load, balancers, anything really. AWS config will record anything that was done over time and we record the configuration over time. So we can always roll back or see what it was a week…

CloudWatch Alarms Now let’s talk about cloudwatch alarms. So, alarms will be used to trigger notification for any kind of metric that used to specify and the alarms can trigger auto scaling. If you do action and SNS notifications, you get various options. You can choose sampling a percentage, you can choose the max, the Min, the average. You have different ways of basically computing your alarm. And the alarm can be in different states, it can be in OK, that means everything is good and that your metric is…

Section Intro We’re finally getting to one of the most important sections for the exam. It is around monitoring, audit and performance. We’ll have a deep look at Cloud Watch, cloud Trail and Config. Now, Cloud Watch is one of the most important topics for the Sysaps exam, but alongside this whole course, as soon as we’ve seen a new technology, we’ve looked at Cloud Watch metrics. So in that regard, we’ve covered many of the services. Cloudwatch Metrics we’ll still look at some important details in Cloud Watch such…

AWS Budgets But now let’s talk about AWS budgets. And this service is actually very similar to Cost Explorer. The only difference is that now you can send alarms when a cost exceeds the budget, and we’ll see how to create these budgets. So there’s three kinds of budgets you can create. There is usage, cost and reservation. We’ll see those in detail in the hands on. For the reserved instances, though, you can get utilization tracking, and you can also get support for EC Two, elastic cache, RDS and…