21. Scaling - Oracle Cloud Infrastructure Foundations - video Dailymotion

Watch 21. Scaling - Oracle Cloud Infrastructure Foundations - Psycho Killer on Dailymotion

Transcript

00:00welcome to this lesson on scaling a very important concept within compute so what is scaling there

00:11are two kinds of scaling which is possible one is called vertical scaling one is called horizontal

00:15scaling as the name signifies here vertical scaling basically means you are scaling up or

00:21scaling down instant shapes now what can you scale well you can scale compute the course you

00:28can scale memory and some of the other characteristics scale accordingly the the important

00:33thing to keep in mind here is when you scale up or scale down there is a downtime required because

00:38likely we take your machine and we instantiate a new when you instantiate a new shape it actually

00:46goes to another host so there is some kind of downtime required keep that in mind when you do

00:51vertical scaling there is another good practice here is you stop your instance before you do

00:57any kind of vertical scaling there is another kind of scaling which is called auto scaling

01:02or also referred to as horizontal scaling now as as you can see in the picture there this basically

01:10means that you add more vms of the same shape or you take away more vms of the same shape this

01:17enables large-scale deployment of vms there is scale out as you can see from the picture you're going from

01:23one vm to four vms or there's also scaling we are going from four vms back to one vm so both models

01:29supported why is this so popular and and powerful the the reason it is so powerful is it gives you that

01:37scaling capability but it also gives you that high availability in this case one virtual machine fails

01:43others can still keep working as you can as you can see from the picture and the thing which makes it

01:49really powerful is you can match traffic demand by adding removing vms automatically so let's say

01:56you are operating a web store suddenly you start getting more traffic you could easily auto scale and

02:01you could add more vms the traffic goes down you could take away those vms that's how it works there is

02:07no extra cost for using auto scaling so how does it work in in practice there are three steps you have to

02:14follow to get auto scaling and it's super easy to do first thing you do is you have a running instance

02:20on which you want to do auto scaling so you create a template and a template is called a config in in oci

02:27terminology it's basically things like your operating system image your metadata the shape the size

02:34and and some other characteristics like storage networking etc so first you create a stamp you have a

02:40running instance you create a stamp of that running instance the second step is you take that stamp

02:46and then you create this thing called a instance pool and pool is basically a collection of those

02:52instances in advance you you create that and the idea here is you can manage all these instances

02:59as one unit so you could stop all of them at the same time you could start them you could terminate them

03:05and to get high availability you could put them in different availability domains

03:09or different data centers so that's step number two and then step number three is you take your

03:14instance pool and then you write these auto scaling rules on that you start with a desired or initial

03:21size there is a minimum size and then there is a maximum size and you write a rule as you can see on

03:28the screen if cpu or memory goes beyond a particular percentage threshold add some instances or if it goes

03:35below some threshold remove some instances and auto scaling is constantly monitoring your traffic

03:41it's constantly monitoring your cpu usage and it's looking at whether to add instances or remove instances

03:50so as you can see in this picture here we started with an initial size of two and then if the cpu goes

03:56beyond 70 percent we have to add two more instances and if it does you have you end up with four instances

04:02so auto scaling not only helps you meet the traffic demand but can also give you high availability

04:09so that's a recap very powerful feature auto scaling and then we also looked at another way of scaling

04:15the vertical scaling i hope you found this lesson useful thanks for watching