Welcome to one more video on questpond's youtube channel.
In this video we will be discussing about five important concepts of Azure which look very obvious when we see the first time
when you see this concepts we will say like we know it.
When we go internally into it we will find that they have
quite of the thing which we should understand when we create
Azure resources.
The first concept is Geography, the second concept is Regions
the third concept is
Availability Set and Availability Zones.
If you are new to Azure, down in the description
we have links from where you can quickly get started with Azure.
Incase you want to apply for certification of AZ 900 we have videos for the samedown below.
and incase you want to do AZ 204 even for the same we have videos.
Down in the description
please see those videos which are more indebth
about how to get started with Azure.
in this video my focus is on these five concepts.
Let us get started
First thing at the top we have
Geography
a geography is the physical boundary of a country
the physical map of the country.
We can have here US
India
Nepal
Bangladesh and so on.
Inside geography we have regions
Inside India we can have
region which is Mumbai
Pune
Bangalore
we have geography
and we have
Regions
As per Azure documentation these regions have to be like 100 miles apart for DR.
If something happens bad in Mumbai we can just shift to pune and if something happens in Pune we can shift to Bangalore.
Inside a region we have a concept of zones
we can have one zone which is probably in Bandra this is zone 1
we can have another zone which is probably in Vashi
that is zone 2.
In these zones we have actual data centers.
here we will have an actual physical building
and inside this physical building we will have
racks out here
Inside these racks we actually have machines
We have
geography at the top
then we have
regions
inside regions we have
zones
and zones have the actual
Data center.
This is how
the physical infrastructure or internally the physical structure of Azure is.
flashing here https://www.azurespeed.com/Information/AzureGeographies
we can see here India
India has three regions at this moment which is Pune, Chennai and Mumbai.
Inside these regions we will have zones.
When we talk about regions Azure has created a primary region and a paired region
for example
if we see India out here there is central India and it is beign paired with south India
Then we have West India and it is paired with south India
This paired region is for the DR purpose and if something happens
bad in this region we can shift to the other region.
The
physical
infrastructure or the thought process are Geography, Regions and Zones.
Whenever using Azure portal we will never see geography as such
until you are talking about Azure Sovereign
until we are talking about sovereign cloud where we have a separate cloud for China, separate cloud for Germany or US
that is to just ensure to follow the rules and regulations of the country
or else we will not really see
this geography as such anywhere, we will normally be dealing with regions.
In the drop down we will see regions and zones but will not really see geography anywhere.
If we try to create
any kind of a resource out here
Let us say we want to create a virtual machine
we will see only regions
but won't see geography as such
Here is a virtual machine out here
this is the region
and we are looking for South India
then automatically it will put into a zone, that zones we will not really have to select
Now that we have the understanding of
the whole infrastructure model we need to understand two more important concepts one is the Availability Set and another one is the Availability Zone.
Both of these things Availability Set and Availability Zone is all about that if one machine goes down
and how quickly we can recover the other machine and how quickly we can start operation on another machine.
If one zone goes down or one data center building goes down then how quickly we can switch to an another zone
It is all about achieving that
SLA of 99.999% up time.
This is the data center inside the zone and this is rack 1 and rack 2
Let's say this data center is properly designed, the top rack 1 has a different
power supply, it has a complete
dedicated hardware which is separate assume that the rack 2 also has a dedicated hardware
If something bad happens this machine
we can create a plan which will say that just switch to
the another rack into some other machine.
This is termed as Availability
Set
Availability Set is
when something happens bad in one machine
we can quickly switch to another machine
but everything is there is same
data center means in the same building.
Availability Set is all about
fault tolerance mechanism or high availability mechanism
which is on the same data center.
Let us say for some reason if this zone itself has a problem, this data center itself has a problem.
then we would switch to different zone out here
this is called as an Availability Zone.
Availability Set is all about having redundancy inside the same building
and Availability Zone is about having redundancy across different data centers.
If we see out here
when we select a region for example we have selected US there is an Availability Set and there is availability zone
If we say Availability Zone it says which one of them
There is
zone1, zone2 they have not given names as such but these are
different buildings internally.
Availability Zone and Availability Set is not available everywhere
let us say if we select India
there is not any availability zone, there is an availability set
please note we already had
a backup region, regions are already there internally
there is always a paired region for example in India
lets take Central India
if we take Central India out here
we don't have availability zone must be this is the only data center
which is available out there
if we select availability set that means it is in the same rack
what if something happens bad in that region
then please note that we have a paired region.
This paired region will automatically switch
if in Central India something bad happens it will just switch to
South India.
Very quickly
revising
we have Geography
we have Regions
we have Zones
and inside Zones we have
Availability Set
and
Availability Zone.
trying to draw a simple diagram out here once again
at the top we have
Geography
then we have
Regions
then we have
Zones
We can have Zone1
Zone2
inside zones we have the actual building which is data center
then we have Rack1 and Rack2 must be, just an example
When one of the machines fails one of the racks we can switch to another machine
on the same data center which is termed as an Availability Set
we can switch between the zones which is termed as the Availability Zone
we can switch between multiple regions
which is termed as the
Paired region.
Paired region
happens automatically because
when we say that something bad has happened in a region that means it is catastrophe
If one machine fails, building fails must be there is a power supply problem or something but
when a region fails that means something serious out there.
they have not given option as such but they will automatically try to
up that region into
some another region
that means we can think about this paired region is like a DR plan
while this Availability Set is all about a
fault tolerance
Please see the video of High Availability and fault tolerance and DR plan.
Some of the things are automatic and some of the things we have to do it manually
The region kind of issue is automatic.
The other ones like Zones and the Sets we have select it.
That brings us to the end of the session and very very quickly
just want to make a point out here
We are uploading videos on Questpond youtube channel at the same time also coming live on saturday and sunday
The last sunday we talked about javascript closures
before that we talked about Azure for beginners
we had Jinal sir who was talking about Nodejs
We had something about Software Architecture training
We took Static vs Singleton
Every week we come online on this channel and take some topic which
can be useful in terms of
growing your knowledge at the same time uploading videos
and please do not forget to visit the
official website questpond.com where we have been uploading videos
keep in touch and happy learning.
Thank you!