From the course: VPC Networking on AWS: Configuration, Security, and Connectivity

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Availability Zones

Availability Zones - Amazon Web Services (AWS) Tutorial

From the course: VPC Networking on AWS: Configuration, Security, and Connectivity

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Availability Zones

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- [Instructor] In this lesson, we're going to take a look at the concept of availability zones. These are really important when you're designing application stacks to run in the cloud. The availability zone is ultimately a physical location, although we never really know where the availability zone is located within the region, and each region has three availability zones as a minimum. Some have six, for example, US East, and there's a couple other ones that have four availability zones, and over time there'll be more regions with more than the default number of three availability zones. Looking at this for the design of an application that you want to always be running, it would make sense to have web servers say in availability zone A and B. Now, in each availability zone there are subnets, and on the subnets are our web servers or containers or databases. So it's really up to you as to how many availability zones you use. If you use one, Amazon will look at you and say you're not…

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