AWS Global Infrastructure
Tags: aws
Published: 2020-07-07 04:43:39

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canonical_url: "https://awsmag.com/blog/aws-global-infrastructure"
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Ever wondered how AWS provide robust infrastructure and high availability to our apps running in cloud. Well in this blog post, we will
answer the question. And the Answer is **AWS Global Infrastructure**. AWS maintains a global infrastructure which is uses to give you the
peace of mind that my app is secure and is running in high availability. This does not mean it is by default as you have to configure it for
high availability. So let's look into the parts of the AWS Global infrastructure and try to understand what it is.

The AWS Global Infrastructure consists of **Regions, Availability Zones, Local Zones, Point of Presence** etc. Let's understand the heavy words we came across above. Have a look at the following image:-

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/2cmws0q6z77rphr2bgt0.png)

In the above Image, we have region as the starting point. Everything is wrapped inside the region. So what is a **Region**?

**Region:** Region is an actual geographic location maintained by AWS to provide a global footprint. Every Region provides
**full redundancy and connectivity to the network**. All the regions in the AWS are connected using a global network so one region 
can talk to another region. Every region consistence of **multiple Availability Zones** which are different data centers to provide redundancy for
your application. Lets look at the naming convention of the regions: **eu-west-1** and **eu-west-2**. Here **"eu"** means that it is in European continent,
**"west"** means it is on the west side and **"1"** is the number of the aws region in that area. eu-west-2 is second aws region on west side of European
continent. All the regions also have their city names where they are located. **eu-west-1** is in **Ireland** and **eu-west-2** is in **London**.
There are special regions which have Gov cloud in their name. This is because these regions are utilised by govt. and are not used by any other clients of AWS.

**Availability Zones:** We talked about Availability Zones when we were defining regions. It is a fully isolated partition in AWS infrastructure.
What does this mean? It means every zone is a **physicaaly different location using separate connections, power supply etc**. This isolation gurantees
the redundancy and high availability for your applications. So if due to some reason, one availability zone goes down, the application hosted on the other one will
be able to serve your customers. You have to configure your deployments to use availability zones. Some of the AWS services provide this by default
like SQS. Every Availbility Zone consists of multiple data centers.

**Point of Presence:** These locations are consists of **Edge Locations and Regional Cache Servers**. There is a CDN service by Amazon called
**Amazon Cloudfront**, uses the location to cater customers globally with low latency and high transfer speeds. Another service launched by AWS called **Global
Accelerator** also use these to upgrade the performance of your application.

**Local Zones:** Local Zones are new offering in AWS. These are **extensions of the Regions in geographic proximity to users**. Every Local
Zone has their own internet connection and support AWS Direct Connect. Local Zones are not available in every region and they have to be
enabled in order to be utilised. The naming convention of the Local Zone is **"us-west-2-laz-1a"**. Here **us-west-2** is the name of the Region and
**lax-1a** indicates the location.

That's a higher level picture of AWS Global infrastructure and we will talk more about them when we start looking into other AWS Services.

PS: The post was originally posted on my newsletter and a blog [awsmag](https://awsmag.com). If you like to recieve these post and other stuff related to AWS, subscribe to my weekly newsletter at [awsmag](https://awsmag.com).