Azure Load Balancers
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Video Transcription
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>> Hey everybody. Welcome back.
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In this lecture,
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we're going to be talking about something
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called Azure Load Balancers.
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We're going to be learning about what
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Azure Load Balancers are, the service,
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we're going to be discussing why
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load balancers are important,
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and then understand some of
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the security features that are
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provided with load balancers.
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What's a load balancer? Well,
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if you've been working in IT for any number of years,
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you've probably heard what it is,
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especially if you deal with
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networking. They're very common.
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It's not just a cloud-based service
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but Azure does have its own proprietary load balancer,
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which is a managed piece of software that you can use.
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They manage the infrastructure for you,
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they deploy the VM,
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and you can configure the load balancer to
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distribute the traffic across
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whatever VMs you're going to be using.
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Really, at a high level,
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that's what a load balancer is.
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It's going to be sharing the traffic,
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the request so that no one VM ever gets overwhelmed.
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It can distribute it out and you can actually set
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parameters in place to define
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how you want that traffic to be distributed.
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For example, you can say I
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want 20 percent of the traffic to be
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sent to this VM and 80 percent
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>> to be sent to another VM,
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>> or however you want.
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You can distribute it across multiple VMs,
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not just one or two but even more than that.
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There's really just so many ways that you can go about
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architecting the load balancing and
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you can do this to provide
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that low latency and that high throughputs architecture
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that you need based on whatever
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your organization defines or
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whatever your organization requires.
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There are two different types of
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load balancers that you can have.
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You can have public load balancers
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or private load balancers.
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Public, meaning that
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the public Internet interfaces with
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the load balancer before the traffic
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gets sent over to
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the VMs inside your subnet within your VNet,
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or I should say, it is in the VNet but it's going to
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be within the actual web tier of the subnet.
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If we look at the graph here,
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you can see what I'm talking about right here.
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We have a TCP port 80,
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this is where all the web traffic
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is from the public Internet,
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is going to hit the public load balancer
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before it goes to
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the individual web servers within your web tier subnet.
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Now an internal load balancer
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or a private load balancer is
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the next load balancer that
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we're going to be hitting from
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all these web servers
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before it hits maybe like the database,
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and the data could be sent over or
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the requests could be sent over via
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whatever ports you want but you
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can change the encryption at the load balancer as well.
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If we wanted to go public and be non-encrypted,
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HTTP without the secure header, we can do that,
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and then if we go to the next load balancer,
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we can go ahead and set it for encryption,
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so it's going at 443.
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We are doing HTTPS instead of HTTP
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before it hits the business tier
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or wherever we want this to be.
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This could be databases, could be
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proprietary information being housed
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within these VMs or whatever.
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That's the high lay of
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the land of what you can do with load balancers.
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The configurations for them are
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pretty robust and actually,
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in one of the labs in this module,
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actually the labs follow this lecture,
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you're going to get the opportunity to
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actually stand up your own load balancers.
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You'll have the opportunity to actually see what
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the process looks like and how it works,
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how difficult or actually how easy it is,
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how simple it is to stand up a load balancer
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and configure the high availability
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of that distribution of traffic.
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Here's a couple of use cases for load balancing.
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Let's say you have
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a load balancer in place because you want to be able to
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distribute the traffic from
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the public Internet to your different web servers.
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Maybe you don't want
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the IP addresses of the web servers to be public,
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so you stick a load balancer in place in front,
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have all the Internet traffic
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interact with that load balancer,
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and that way you're protecting
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the secrecy or the details
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>> of the web servers themselves.
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>> There's a lot of different reasons
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>> why you go about doing
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>> this and it provides high availability,
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which is basically the number one reason.
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If we're talking about security,
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we go back to the CIA triad,
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confidentiality, integrity, and availability.
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A load balancer is going to be
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considered an availability control,
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a security control for
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availability because it ensures that
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no one virtual machine ever
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goes down because of a DDoS attack or
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because there's just an overload of traffic,
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being sent to that one server
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that it just cannot handle it.
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One way that it does this is by using health probes to
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monitor those virtual machines and
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then it can work together with
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a auto-scaling group or
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using skillsets to increase
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the number of virtual machines that are available.
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When you combine load balancers
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and auto-scaling or skill sets,
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you're able to provide that security control
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of high availability and
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load balancing across your architecture.
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That about wraps up this lecture.
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In this lecture, we talked about
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an introduction of what Azure Load Balancing is.
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This is very much a piggyback off of
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the last lecture where we talked about skillset.
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You got to understand how the two work together to
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create a highly available solution,
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and then we also talked about
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the different types of Azure Load Balancers that are
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available to you and
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a few use cases as to
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>> why you may want to implement this.
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>> That wraps up this lecture.
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I will see you in the next one.
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